Difference between revisions of "Plasma"
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chalcedony | chalcedony | ||
| − | == | + | ==Physical and Chemical Properties== |
| − | Fracture = conchoidal. Luster = waxy. Streak = white. | + | * Fracture = conchoidal. |
| + | * Luster = waxy. | ||
| + | * Streak = white. | ||
| + | * Mohs Hardness = 7.0 | ||
| + | * Density = 2.6 g/ml | ||
| − | + | ==Resources and Citations== | |
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| − | + | * J. Ogden, ''Jewelry of the Ancient World'', Rizzoli International Publications, New York, 1982. | |
| − | + | * Mineralogy Database: [http://www.webmineral.com/data/Quartz.shtml Quartz] | |
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[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 14:07, 17 August 2022
Description
(geology) An archaic name for a translucent green gemstone. Plasma stones are composed of a bright green cryptocrystalline quartz (chalcedony) and often have patches of white or yellow. They are native to India and Egypt. Many poor quality emeralds have been misidentified as plasma gemstones. Plasma stones are called bloodstone when they contain small red spots of jasper.
Synonyms and Related Terms
chalcedony
Physical and Chemical Properties
- Fracture = conchoidal.
- Luster = waxy.
- Streak = white.
- Mohs Hardness = 7.0
- Density = 2.6 g/ml
Resources and Citations
- J. Ogden, Jewelry of the Ancient World, Rizzoli International Publications, New York, 1982.
- Mineralogy Database: Quartz