There are two prominent subspecies of quartz, crystalline and cryptocrystalline. The fine grained cryptocrystalline varieties are usually known collectively as chalcedony. The most prized of all the chalcedonies, chrysoprase, is the fine grained fibrous apple green variety. It owes its lovely color to the presence of hydrated nickel silicate. It is usually either cut as cabochons or as beads and carvings. |
| Known Facts | | Refractive Index: | 1.544 - 1.553 | | Chemical Composition: | SIO2 | | Hardness: | 7 | | Density: | 2.65 - 2.66 | | Crystal Group: | Hexagonal | | Ocurrence: | Australia, Tanzania |
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