(via The Canadian Gemmologist, Vol.III, No.4, Spring, 1982) My color is caused by copper and I am considered idiochromatic. If you put acid on me, I fizz like a shaken bottle of cola. Monoclinic in structure, with an R.I somewhere between 1.65 – 1.90, I am used for jewelry and for carving. What am I?
Answer: Malachite
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