demantoid

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a green andradite used as a gemstone

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The demantoid crystals and crystal clusters are fairly small, perhaps 3-4 mm across, but they cover the matrix almost completely.
5-cm anatase crystal on adularia matrix from Hardangervidda, and a couple of wonderful thumbnails of seldom-seen brookite from the same place; the Museum of Natural History, Milan had two cases with, among other things, a 30-cm plate of amphibolite covered with gemmy lustrous demantoid crystals to 3 cm, from Sferlum, Malenco Valley, Italy.