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question &contribution
by husni abar
I have many gemstones. They are trasparent crystals. They are hundred years old dan they had been cut. Their colours are White, yellow, blue, pink, purple, black to blue, cocacola, brown. Their hardness are 9,5 more Mohs scale. But I can not know the chemical elements. And also, I have the green, and hardness is up to 8 Mohs scale, and so I don't know what chemical elements is.
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