(via The Canadian Gemmologist, Vol.III, No.3, Spring, 1982) . I come in a variety of colors, almost any color in fact, though most people think of me as a green stone which is relatively inexpensive. I frequently show strong dichroism. In rough crystals, I am quite strongly striated parallel to the c-axis. They call me a hemimorphic crystal. What am I?
Answer: Tourmaline
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