schorl iron tourmaline crystalline boron silicate mineral |
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navigate by keyword : black boron close collectable collection crystal crystalline crystals gem gemmology gemology gemstone geological geology gray iron macro material mine mineral mineralogical mineralogy natural nature object ornamental piece raw rock rough sample schorl semiprecious shorl silicate sodium specimen stone structure surface texture textured tourmaline tourmalinite turmaline |
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Schorl, iron tourmaline, crystalline boron silicate mineral, close view |
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