  Spodumene is sometimes cut and polished as a gem, but its peculiar cleavage makes it a bad stone for the lapidary to cut and the jeweler to mount. Its hardness is 6.5 to 7, specific gravity 3.13 to 3.19, and lustre, vitreous to pearly. Grayish-green, greenish-white, and sometimes yellow or faint red are the colors. Its composition is:
Acids do not attack spodumene, and under the blow-pipe it fuses to a white glass. |
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