Cancrinit - angew. Mineralogie

Cancrinite
VIII - Tectosilicates

Crystal habit of Cancrinite

`Name`		`Cancrinite`
`Chemistry`		`Na₆Ca[CO₃\|(AlSiO₄)]·2H₂O`
`Hardness`		`6`
`Lustre`		`vitreous`
`Colour`		`blue, colourless, grey green, yellow white`
`Streak`		`white`
`Density [g/cm³]`		`2.4 - 2.5`
`Crystal habit`		`hexagonal, crystals short, prismatic, extremely rare`
`Cleavage, Fracture`		`[1010] perfect, fracture conchoidal to uneven`
`other characteristics and occurrences`		`in plutonic, SiO₂-undersaturated rocks and metasomatic formation by alteration of nepheline in igneous rocks`

© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst

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