Pyrope
Pyrope is a type of garnet group mineral, prized for its deep red to reddish-purple color. Historically, it was used in amulets during the Middle Ages, known then as "Carbuncle." Czech pyrope is particularly famous, known for being mined from the medieval period through the early modern era. While pure pyrope is technically colorless (though no such specimens have been confirmed), in actual jewelry, it often appears reddish-purple due to the solid solution of almandine. Its red color is caused by the presence of Fe (iron) and Cr (chromium).
A type of garnet with a deep red color reminiscent of ruby
Basic Information
| English Name | Pyrope |
|---|---|
| Japanese Name | Kobanzekiriseki (Red Garnet) |
| Chemical Composition | Mg3Al2(SiO4)3 |
| Crystal System | Isometric |
| Hardness | 7–7.5 |
| Specific Gravity | Approx. 3.76 |
| Transparency | Transparent to translucent (varies by specimen) |
Characteristics & Varieties
- Historical Background: It is said to have been used as a protective amulet under the name "Carbuncle" during the Middle Ages.
- Major Origins: Czech pyrope is particularly renowned, having been mined from the medieval period through the early modern era.
- Causes of Color: Fe and Cr are responsible for the red coloration. Additionally, the solid solution of almandine often gives it a reddish-purple hue.
- Formation Environment: It is often cited as a mineral that forms within the Earth's mantle, alongside diamond and peridot.
Varieties
- Chrome Pyrope: Specimens with higher Cr content exhibit a distinct blood-red color and are considered rare and valuable.
Origin, Aliases, Treatments, and Similar Stones
Trade Names:
Because pyrope resembles ruby, it is known for having many misleading trade names.
- Adelaide Ruby (South Africa)
- Arizona Ruby
- Fakahop Ruby (Tanzania)
- Cape Ruby (South Africa)
Similar Stones:
Caution: Even if a trade name includes the word "ruby," the material may actually be pyrope (a type of garnet). Do not rely solely on the name; it is safer to check the laboratory report or identification documents. Furthermore, when distinguishing from ruby, remember that ruby has a hardness of 9, which is a helpful identifier.