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

Tourmaline specimens

19 pieces in the collection.

Chemistry
a group of complex borosilicates
Crystal system
trigonal
Mohs hardness
7 to 7.5

Crystals are striated along their length and often change color from one end to the other.

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