Orthoclase
From Antique Jewelry University
Orthoclase is a mineral series in the feldspar group.
Gemological information
| Gemological Information for Orthoclase Feldspar | |
|---|---|
| Color | Colorless, White, Green, Orange, Yellow, Brown, Gray and Black |
| Crystal Structure | Monoclinic |
| Refractive Index | 1.518 to 1.526 |
| Durability | Not Very Durable |
| Hardness | 6 to 6.5 |
| Similar Stones | Chalcedony and Quartz |
| Treatments | Blue or Black Coating on Reverse |
| Country of Origin | sri Lanka, Myanmar, India |
| Orthoclase Feldspar Care | |
| Ultrasonic Cleaning | Mever |
| Steam Cleaning | Never |
| Warm Soapy Water | Safe |
| Chemical Attack | Hydrofluoric Acid |
| Light Sensitivity | Stable |
| Heat Sensitivity | Can Crack or Cleave when Heated |
Sources
Gem Reference Guide, Los Angeles: Gemological Institute of America, 1988. Pp. 103-105.
Newman, Harold. An Illustrated Dictionary of Jewelry, New York: Thames and Hudson, 1981. Pp. 224.
Schumann, Walter. Gemstones of the World, New York: Sterling Publishing, Co., 1977. Pp. 164.