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

Chalcopyrite specimens

12 pieces in the collection.

Chemistry
CuFeSâ‚‚, copper iron sulfide
Crystal system
tetragonal
Mohs hardness
3.5 to 4

A brassy copper ore that can tarnish to iridescent blues and purples; keep it dry.

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