Prasiolite: Difference between revisions
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== Description == | == Description == | ||
A rare, green transparent [[quartz]] that contains small amounts of hydrated nickel silicate. Prasiolite is a rare stone in nature, but can sometimes be formed by the heat treatment of [[amethyst]]. It is sometimes confused with [[chrysoprase]], which is more translucent. | |||
== Synonyms and Related Terms == | == Synonyms and Related Terms == | ||
chert | vermarine; lime citrine; prase; chert | ||
== Physical and Chemical Properties == | |||
* Insoluble in acids except for hydrofluoric acid. Slightly soluble in alkalis. | |||
* Trigonal crystal system. Low birefringence. Low thermal expansion. | |||
* Fracture = conchoidal. | |||
* Luster = vitreous to greasy. | |||
* Streak = white. | |||
* Microscopically, particles are transparent. | |||
* Crossed polars shows low birefringence and first order grays | |||
{| class="wikitable" | |||
|- | |||
! scope="row"| Mohs Hardness | |||
| 7.0 | |||
|- | |||
! scope="row"| Density | |||
| 2.65-2.66 g/ml | |||
|- | |||
! scope="row"| Refractive Index | |||
| 1.544; 1.553 | |||
|} | |||
[[Category:Materials database]] | [[Category:Materials database]] | ||
Revision as of 16:03, 21 December 2022
Description
A rare, green transparent quartz that contains small amounts of hydrated nickel silicate. Prasiolite is a rare stone in nature, but can sometimes be formed by the heat treatment of amethyst. It is sometimes confused with chrysoprase, which is more translucent.
Synonyms and Related Terms
vermarine; lime citrine; prase; chert
Physical and Chemical Properties
- Insoluble in acids except for hydrofluoric acid. Slightly soluble in alkalis.
- Trigonal crystal system. Low birefringence. Low thermal expansion.
- Fracture = conchoidal.
- Luster = vitreous to greasy.
- Streak = white.
- Microscopically, particles are transparent.
- Crossed polars shows low birefringence and first order grays
| Mohs Hardness | 7.0 |
|---|---|
| Density | 2.65-2.66 g/ml |
| Refractive Index | 1.544; 1.553 |