Minerals

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General Information

Kyanite

Kyanite, also named disthene, is an aluminium silicate that belongs to the group of nesosilicates.[1]

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Chemical & Physical Information

Trivial NameKyanite
Chemical NameAluminium Silicate
Chemical FormulaAl2SiO5
Density3,61 g·cm-3
Molar mass-
Hardness4-7
Crytal systemTriclinic
Unit cell-
Crystal habitPillars, fibrous
FractureSplinters
CleavagePerfect [100]
ColourBleu, white, grey, green or black
LusterPearl
StreakWhite
OpacityTranslucent or transparent
SafetySafe
ExtraRarely has cat eye effect.
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Photos

Kyanite

(3 cm)

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Sources

[1] Wikipedia

[2] Specimen from my personal collection, photo taken by me.