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noun Mineralogy.
a sodium-rich amphibole, occurring in green to black crystals in alkalic rocks.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Arfvedsonite
is always a great word to know.
So is gobo. Does it mean:
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
| a chattering or flighty, light-headed person. |
Encyclopedia Britannica
Encyclopedia
arfvedsonite
amphibole mineral, an iron-rich sodium silicate. Lithium and magnesium replace iron in the structure to form eckermannite. Both minerals characteristically occur as dark-green crystals in alkali igneous rocks and their associated pegmatites. For chemical formula and detailed physical properties, see amphibole (table)
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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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