Kalsilite - KAlSiO4

Kalsilite (pure potash analogue to nepheline) is a very rare mineral occurring in volcanic rocks very poor in Si and Na. It appear in groundmass grains or phenocrysts, sometime complexly zoned ore intergrowth with nepheline. Kalsilite may contain minor Na and may be unusually rich in Ferric iron, which replace Al.

Kalsilite is a common Mineral in some rare rocks such as Venanzites (a rare kamafugitic rock, a Kalsilite-phlogopite-olivine-leucite melilitite).

Optical properties
• Color:colorlessbr /> • Form: Tabular crystals or granula aggregates
• Interference colors: I order white-gray
• Relief: low


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
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kalsilite crystal in a venanzite. PPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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Basal section of kalsilite in a venanzite. XPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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Melilite, Phlogopite and Kalsilite (gray). XPL image , 10x (Field of view = 2mm)
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kalsilite crystal in a venanzite. XPL image , 10x (Field of view = 2mm)
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Melilite, Phlogopite and Kalsilite (gray). XPL image , 10x (Field of view = 2mm)