Difference between revisions of "Prasiolite"
From The Gemology Project
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Prasiolite is the green variety of [[quartz]].<br /> | Prasiolite is the green variety of [[quartz]].<br /> | ||
The color is caused by heat of either natural occuring [[amethyst]] (by exposure to sunlight) or by artificial heat treatment of irradiated amethyst. The former will give a more stable green color that is less prone to fading. | The color is caused by heat of either natural occuring [[amethyst]] (by exposure to sunlight) or by artificial heat treatment of irradiated amethyst. The former will give a more stable green color that is less prone to fading. | ||
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+ | Synonyms: Greened amethyst, green quartz.<br /> | ||
+ | Misnomers: Green amethyst. |
Revision as of 10:39, 5 July 2007
Prasiolite | |
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Chemical composition | SiO2 Silicon dioxide |
Crystal system | Trigonal |
Habit | Prismatic |
Cleavage | Poor |
Fracture | Conchoidal |
Hardness | 7 |
Optic nature | Uniaxial + |
Refractive index | 1.544 - 1.553 |
Birefringence | 0.009 |
Dispersion | 0.013 |
Specific gravity | 2.63 - 2.65 |
Lustre | Vitreous |
Pleochoism | Weak to strong |
Prasiolite is the green variety of quartz.
The color is caused by heat of either natural occuring amethyst (by exposure to sunlight) or by artificial heat treatment of irradiated amethyst. The former will give a more stable green color that is less prone to fading.
Synonyms: Greened amethyst, green quartz.
Misnomers: Green amethyst.