Diaspore - AlO(OH)

Named in 1801 by Abbé Rene Just Hauy (for an occurrence in Mramorsk Zavod, Sverdlovskaya Oblast, Middle Urals, Russia) from the Greek word to scatter, in allusion to the usual decrepitaton in the blowpipe flame.

Diaspore is the main component of bauxite and some laterites (along with gibbsite and boehmite, is a major component of these rocks) and forms by the alteration of aluminuous minerals. Diaspore is found also as a hydrothermal mineral in some alkalic pegmatites, like in the Sagåsen Quarry (Norway).

Optical Properties:
Habit: Tabular, Platy (Sheet forms like micas). Or in small, distinct particles dispersed in matrix.
Color: Colorless.
Cleavage: {010} Perfect.
Relief: High.
Pleochroism: colorless or pale red/violet.
Birefringence: High, IV order.

diasporo.jpg

Purple Diaspore with natrolite. Pegmatite from Saga quarry, Sagåsen,Telemark, Norway



diaspore(andy)(1).jpg

Panoramic view of a Diaspore-Natrolite Pegmatite. Image by Andy Tindle (Virtual Microscope). PPL image, field of view = 2.5cm. See also Diaspore-Natrolite - Virtual Microscope




diaspore(andy)(2).jpg

Panoramic view of a Diaspore-Natrolite Pegmatite. Image by Andy Tindle (Virtual Microscope). XPL image, field of view = 2.5cm. See also Diaspore-Natrolite - Virtual Microscope




Bibliography



• Deer, W.A., Howie, R.A., Zussman, J. (1998) Rock-forming Minerals.
• Optical Mineralogy : The Nonopaque Minerals by Phillips / Griffen
• E. WM. Heinrich (1956): Microscopic Petrografy. Mcgraw-hill book company,inc


Photo
natrolite(93).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 1x (Field of view = 9mm)
natrolite(94).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 1x (Field of view = 9mm)
natrolite(95).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 1x (Field of view = 9mm)
natrolite(96).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 1x (Field of view = 9mm)
natrolite(100).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 1x (Field of view = 9mm)
natrolite(108).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 1x (Field of view = 9mm)
natrolite(1).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 2x (Field of view = 7mm)
natrolite(2).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(3).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 2x (Field of view = 7mm)
natrolite(4).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(5).jpg

Diaspore (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 2x (Field of view = 7mm)
natrolite(6).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(8).jpg

Diaspore (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 2x (Field of view = 7mm)
natrolite(9).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(10).jpg

Diaspore (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 2x (Field of view = 7mm)
natrolite(11).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(12).jpg

Small diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 2x (Field of view = 7mm)
natrolite(13).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(20).jpg

Diaspore crystal (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(14).jpg

Small diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 2x (Field of view = 7mm)
natrolite(15).jpg

Small diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 2x (Field of view = 7mm)
natrolite(22).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 10x (Field of view = 2mm)
natrolite(23).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(24).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 10x (Field of view = 2mm)
natrolite(25).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(26).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 10x (Field of view = 2mm)
natrolite(27).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(35).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 10x (Field of view = 2mm)
natrolite(36).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(37).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 10x (Field of view = 2mm)
natrolite(38).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(39).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(40).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(41).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 10x (Field of view = 2mm)
natrolite(42).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(43).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(44).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(45).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(46).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(48).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(49).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(50).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(51).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(52).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(53).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(69).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(70).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(72).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(83).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 10x (Field of view = 2mm)
natrolite(84).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 10x (Field of view = 2mm)
natrolite(81).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(88).jpg

Diaspore crystals (high relief; pale-pink) within a matrix formed by fibrous natrolite crystals (colorless and with dusty appearance due to numerous inclusions). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). PPL image, 20x (Field of view = 1mm)
natrolite(89).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(90).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 20x (Field of view = 1mm)
natrolite(113).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 1x (Field of view = 9mm)
natrolite(118).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 1x (Field of view = 9mm)
natrolite(119).jpg

Diaspore crystals (high birefringence) within a matrix formed by fibrous natrolite crystals (I order gray-yellow). Alkaline pegmatite from Sagåsen quarry, Tvedalen (Norway). XPL image, 1x (Field of view = 9mm)