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Definition
| trade term for a vibrant green tourmaline that's colored by traces of vanadium, chromium, or both |
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Definition
| trade term for blue tourmaline |
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Term
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Definition
| a mineral that's been broken down from a crystalline to a partly amorphous state by emanations from radioactive impurities |
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Definition
| trade term for rare, expensive, vibrant green to blue or violet elbaite, tourmaline, originally found only in Brazil's Paraiba state |
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Definition
| gems that show color zoning with two or more colors |
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Definition
| trade name for pink to red elbaite tourmaline |
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Term
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Definition
| a tourmaline, usually elbaite, with color zoning made up of a pink central zone surrounded by a green overgrowth |
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