Topaz
Topaz is a gemstone cherished since ancient times for its combination of clarity and hardness. In particular, "Imperial Topaz" from Brazil and Pakistan is highly valued for its exceptional beauty, ranging from orange to pink hues. The origin of its name dates back to ancient Greece, where it was originally used to refer to peridot.
Orange-pink Imperial Topaz
Basic Information
| Chemical Formula | Al₂SiO₄(F,OH)₂ |
|---|---|
| Classification | Orthorhombic system |
| Hardness | 8 (Mohs scale) |
| Specific Gravity | 3.56 (F-type), 3.53 (OH-type) |
| Note | Classified into F-type and OH-type. The latter is treated as Imperial Topaz. |
Characteristics
-
Etymology: In ancient Greece, peridot was referred to as "topaz."
-
Differences by Type: F-type is standard topaz, while OH-type forms elongated crystals and is known as "Imperial Topaz."
-
Color Diversity: Available in various colors such as yellow, orange, pink, and colorless, often achieved through heating or irradiation treatments.