Calcite
From Antique Jewelry University
Gemological information
| Gemological Information for Calcite | |
|---|---|
| Color | Transparent, Colorless and most other colors |
| Crystal Structure | Hexagonal (trigonal) |
| Refractive Index | 1.486 to 1.658 |
| Durability | Single Crystal=Poor Aggregates=Fair to Good |
| Hardness | 3 |
| Similar Stones | Aragonite, Chalcedony, Coral, Alabaster |
| Treatments | Dyeing, Impregnation with Wax and Plastic, Irradiation |
| Country of Origin | Mexico, U.S. |
| Calcite Care | |
| Ultrasonic Cleaning | Never |
| Steam Cleaning | Never |
| Warm Soapy Water | Usually Safe |
| Chemical Attack | Effervesces to Certain Acids |
| Light Sensitivity | Natural Colors Stable |
| Heat Sensitivity | Decrepitates at Higher Temps |
Sources
Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 41-43.
Schumann, Walter. Gemstones of the World, New York: Sterling Publishing, Co., 1977. Pp. 208.