(via The Canadian Gemmologist, Vol.III, No.3, Spring, 1982) I am green in color and considered idiochromatic. I contain iron as an important part of my chemical composition. I am comparatively soft and belong to the orthorhombic system. I have a distinctive cleavage parallel to my vertical axis, a lowest R.I of 1.654 and a birefringence of 0.036. My absorption spectrum shows a broad band at 435nm and bands at 492 and 473nm. What am I?
Answer: Peridot
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