Held at Namaste Bookshop, 2 W 14th St · Pickup or deliveryDaily from 11 AMCollect in Manhattan

Kyanite specimens

18 pieces in the collection.

Chemistry
Al₂SiO₅, aluminum silicate
Crystal system
triclinic
Mohs hardness
4.5 to 7, depending on direction

One of the few minerals whose hardness changes noticeably with direction along the blade.

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