Difference between revisions of "Chrysoprase"
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[[File:1998.400a-b-SC8651.jpg|thumb|Decanter<br>MFA# 1998.400]] | [[File:1998.400a-b-SC8651.jpg|thumb|Decanter<br>MFA# 1998.400]] | ||
== Description == | == Description == | ||
| − | + | [[File:SC184961.jpg|thumb|Arts & Crafts brooch<br>MFA# 2008.264]] | |
A translucent, apple-green stone composed of microcrystalline [[quartz]]. Chrysoprase is a variety of [[chalcedony]] that contains small amounts of hydrated nickel silicate. The gemstone has occasionally been found in Egyptian, Greek, and Roman jewelry. Chrysoprase was also valued for mural decorations. | A translucent, apple-green stone composed of microcrystalline [[quartz]]. Chrysoprase is a variety of [[chalcedony]] that contains small amounts of hydrated nickel silicate. The gemstone has occasionally been found in Egyptian, Greek, and Roman jewelry. Chrysoprase was also valued for mural decorations. | ||
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== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | Fracture = conchoidal. Luster = vitreous to waxy. Streak = white. | + | * Fracture = conchoidal. |
| − | + | * Luster = vitreous to waxy. | |
| − | + | * Streak = white. | |
| − | + | * Mohs Hardness = 7.0 | |
| − | + | * Density = 2.6 g/ml | |
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== Comparisons == | == Comparisons == | ||
Revision as of 08:27, 30 May 2022
Description
A translucent, apple-green stone composed of microcrystalline Quartz. Chrysoprase is a variety of Chalcedony that contains small amounts of hydrated nickel silicate. The gemstone has occasionally been found in Egyptian, Greek, and Roman jewelry. Chrysoprase was also valued for mural decorations.
Synonyms and Related Terms
chalcedony; crisoprásio (Port.); Chrysopras (Deut.)
Physical and Chemical Properties
- Fracture = conchoidal.
- Luster = vitreous to waxy.
- Streak = white.
- Mohs Hardness = 7.0
- Density = 2.6 g/ml
Comparisons
Properties of Common Gemstones
Resources and Citations
- Mineralogy Database: Quartz
- Jack Odgen, Jewellery of the Ancient World, Rizzoli International Publications Inc., New York City, 1982
- A.Lucas, J.R.Harris, Ancient Egyptian Materials and Industries, Edward Arnold Publishers Ltd., London, 4th edition, 1962
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971 Comment: p. 647