Mineral Identification : Sillimanite and Kyanite

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Luster - vitreous, (sillimanite sometimes earthy if weathered)
Streak - white
Hardness - sillimanite 7, kyanite variable hardness with orientation 4.5-7
Density - moderately dense
Cleavage - sillimanite = perfect in 1 direction, Kyanite = perfect in 2 directions
Color - white to variable, kyanite displays much stronger colors
Crystal system - kyanite = triclinic, sillimanite = orthorhombic
Crystal form/habit - bladed elongated
Extra notes - sillimanite is very brittle
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Rewelacyjne materialy robisz :) Mozna prosic o identyfikacje skal w terenie ? Bylo by super gdyby omowic dane gatunki skal i jakie mineraly w nich wystepuja, na co nalezy zwracac uwage przy poszukiwaniu etc :)

GemPassionpl
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Just went to graves mountain Georgia, saw a lot of stuff like that .

diggingappalachia
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How do you tell the difference between sillimanite and petrified wood?

cathysabin
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