An amorphous form of hydrated silica resembling chalcedony, often white or colourless (common opal), but varying through blue-green and orange…
| 单词 | θ7024 |
| 释义 | the world > the earth > minerals > types of mineral > silicates > tectosilicate > [noun] > quartz > amorphous quartz or opal (33) opala1398 An amorphous form of hydrated silica resembling chalcedony, often white or colourless (common opal), but varying through blue-green and orange… pederote1585 A kind of opal. Subcategories:— hyalite (2) — geyserite (2) — others (27) |
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