Catapleiite - Na2Zr(Si3O9) * 2H2O

Catapleiite was first described from Laven, Langesundsfjorden, Norway. The name is from the Greek words kata, meaning "at" or "with," and pleios, meaning "majority" or "many", as it is always found with other rare minerals. Catapleiite is relatively common minor constituent of alkaline plutonic rocks, particularly nepheline and sodalite syenites, and their associated pegmatite and veins. Catapleiite is rarely a primary mineral and it usually occur as a replacement product of eudialyte. A notable exception is the presence of primary catapleiite both as phenocryst and as constituent of the groundmass in the grennaites (eudyalite-syenites) of Norra Karr alkaline complex in Sweden. In some grennaite pegmatites catapleiite occurs in well-developed crystals and may constitute as much as 10 vol.% of the rock.

Optical properties:
Form: Pseudohexagonal, tabular crystals.
Cleavage: Perfect on (001) and (101).
Color: Colorless in thin section.
Birefringence: High, from yellow to violet.

catapleiite.jpg

Brown catapleiite from Langesundsfjorden, Larvik, Norway. From Dakota Matrix Minerals.




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
larvik2018(16).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(17).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(18).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(19).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(22).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(23).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(29).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(30).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(31).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(32).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(33).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(34).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(54).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(55).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(58).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(61).jpg

Catapleiite (colorless) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(62).jpg

Catapleiite (blue-violet interference colors) crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(63).jpg

Catapleiite (colorless) and aegirine (green) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(65).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(66).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(68).jpg

Catapleiite (colorless) and aegirine (green) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 2x (Field of view = 7mm)
larvik2018(69).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 2x (Field of view = 7mm)
larvik2018(74).jpg

Catapleiite (colorless) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(75).jpg

Catapleiite (blue-violet interference colors) crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 10x (Field of view = 2mm)
larvik2018(76).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(77).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(78).jpg

Catapleiite (blue-violet interference colors) and astrophyllite crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 10x (Field of view = 2mm)
larvik2018(79).jpg

Catapleiite (colorless) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(80).jpg

Catapleiite (blue-violet interference colors) crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 10x (Field of view = 2mm)
larvik2018(85).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(90).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(91).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(92).jpg

Catapleiite (colorless) and astrophyllite (brown) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(102).jpg

Catapleiite (colorless) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(104).jpg

Catapleiite (colorless) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(105).jpg

Catapleiite (blue-violet interference colors) crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 10x (Field of view = 2mm)
larvik2018(106).jpg

Catapleiite (blue-violet interference colors) crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 10x (Field of view = 2mm)
larvik2018(110).jpg

Catapleiite (colorless) crystals in a syenite from Langesundsfjorden, Larvik (Norway). PPL image, 10x (Field of view = 2mm)
larvik2018(112).jpg

Catapleiite (blue-violet interference colors) crystals in a syenite from Langesundsfjorden, Larvik (Norway). XPL image, 10x (Field of view = 2mm)