A form of silica with a clathrate structure containing organic impurities, which crystallizes in the tetragonal system and occurs as minute cubic…
| 单词 | θ7000 |
| 释义 | the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > silica > varieties (4) melanophlogite1876 A form of silica with a clathrate structure containing organic impurities, which crystallizes in the tetragonal system and occurs as minute cubic… lechatelierite1916 Naturally occurring vitreous silica, SiO2, formed when siliceous material is intensely heated (as by lightning). keatite1954 An artificial modification of silica produced at high pressures as tetragonal crystals. stishovite1962 A dense, tetragonal polymorph of silica, formed at very high pressure and found in meteorite craters. Cf. coesite, n. |
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