Difference between revisions of "Carnelian"
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== Physical and Chemical Properties == | == Physical and Chemical Properties == | ||
| − | Trigonal crystal system Fracture = conchoidal. Luster = vitreous to waxy. Streak = white. | + | * Trigonal crystal system |
| + | * Fracture = conchoidal. | ||
| + | * Luster = vitreous to waxy. | ||
| + | * Streak = white. | ||
{| class="wikitable" | {| class="wikitable" | ||
| Line 21: | Line 24: | ||
|- | |- | ||
! scope="row"| Density | ! scope="row"| Density | ||
| − | | 2.6 | + | | 2.6 g/ml |
|} | |} | ||
[[File:image9_carnelian.jpg|thumb|Carnelian cabochon]] | [[File:image9_carnelian.jpg|thumb|Carnelian cabochon]] | ||
| + | |||
== Comparisons == | == Comparisons == | ||
Revision as of 13:56, 20 May 2022
Description
A pale orange-red to deep red translucent stone that is a variety of Chalcedony. Carnelian was mined or gathered as an ornamental stone since at least 3000 BCE. It is found in Egypt, India and areas of Europe as water-worn pebbles. Carnelian was popular for amulets and scarabs and is still used as gemstones.
Synonyms and Related Terms
sard; cornelian; chalcedony; Karneol (Deut., Pol.); cornaline (Fr.); cornalina (Esp., Port.)
Physical and Chemical Properties
- Trigonal crystal system
- Fracture = conchoidal.
- Luster = vitreous to waxy.
- Streak = white.
| Composition | SiO2 |
|---|---|
| Mohs Hardness | 7.0 |
| Density | 2.6 g/ml |
Comparisons
Properties of Common Gemstones
Resources and Citations
- Mineralogy Database: Quartz
- Encyclopedia Britannica, http://www.britannica.com Comment: "carnelian." Accessed 14 Sept. 2001 .
- C.W.Chesterman, K.E.Lowe, Audubon Society Field Guide to North American Rocks and Minerals, Alfred A. Knopf, New York, 1979
- Wikipedia: http://en.wikipedia.org/wiki/Carnelian (Accessed Sept. 14, 2005)