Difference between revisions of "Chrysoprase"
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| − | [[File:1998.400a-b-SC8651.jpg|thumb|]] | + | [[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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chalcedony; crisoprásio (Port.); Chrysopras (Deut.) | chalcedony; crisoprásio (Port.); Chrysopras (Deut.) | ||
| − | == | + | == Physical and Chemical Properties == |
| − | Fracture = conchoidal | + | * No visible crystals |
| + | * Fracture = conchoidal, granular | ||
| + | * Luster = waxy to greasy | ||
| + | * Streak = white | ||
| + | * Fluorescence = generally inert | ||
| + | * Pleochroism = absent | ||
{| class="wikitable" | {| class="wikitable" | ||
| + | |- | ||
| + | ! scope="row"| Composition | ||
| + | | SiO2 | ||
|- | |- | ||
! scope="row"| Mohs Hardness | ! scope="row"| Mohs Hardness | ||
| − | | 7.0 | + | | 6.0-7.0 |
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2. | + | | 2.65-2.91 g/ml |
| + | |- | ||
| + | ! scope="row"| Refractive index | ||
| + | | 1.535 - 1.539 | ||
| + | |- | ||
| + | ! scope="row"| Birefringence | ||
| + | | 0.004 - 0.009 | ||
|} | |} | ||
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== Comparisons == | == Comparisons == | ||
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[[media:download_file_466.pdf|Properties of Common Gemstones]] | [[media:download_file_466.pdf|Properties of Common Gemstones]] | ||
| − | + | ==Resources and Citations== | |
| − | + | * Gem Identification Lab Manual, Gemological Institute of America, 2016. | |
| − | == | + | * Mineralogy Database: [http://www.webmineral.com/data/Quartz.shtml Quartz] |
| − | |||
* Jack Odgen, ''Jewellery of the Ancient World'', Rizzoli International Publications Inc., New York City, 1982 | * 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 | * 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 | * 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 | * G.S.Brady, ''Materials Handbook'', McGraw-Hill Book Co., New York, 1971 Comment: p. 647 | ||
| − | + | * Wikipedia: [https://en.wikipedia.org/wiki/Chrysoprase Chrysoprase] Accessed Dec 2022. | |
[[Category:Materials database]] | [[Category:Materials database]] | ||
Latest revision as of 11:14, 19 December 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
- No visible crystals
- Fracture = conchoidal, granular
- Luster = waxy to greasy
- Streak = white
- Fluorescence = generally inert
- Pleochroism = absent
| Composition | SiO2 |
|---|---|
| Mohs Hardness | 6.0-7.0 |
| Density | 2.65-2.91 g/ml |
| Refractive index | 1.535 - 1.539 |
| Birefringence | 0.004 - 0.009 |
Comparisons
Properties of Common Gemstones
Resources and Citations
- Gem Identification Lab Manual, Gemological Institute of America, 2016.
- 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
- Wikipedia: Chrysoprase Accessed Dec 2022.