mineral
Imperial Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
Hardness: 8.0 on Mohs scale; Color: Pinkish-orange to golden sherry; Luster: Vitreous; Crystal structure: Orthorhombic; Cleavage: Perfect basal; Specific gravity: 3.4-3.6
- Hardness
- 8
- Color
- Pinkish-orange to golden sherry
- Luster
- Vitreous
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Physical properties
Hardness: 8.0 on Mohs scale; Color: Pinkish-orange to golden sherry; Luster: Vitreous; Crystal structure: Orthorhombic; Cleavage: Perfect basal; Specific gravity: 3.4-3.6
Formation & geological history
Formed in high-temperature hydro-thermal veins and in cavities within granitic pegmatites or rhyolites. This specimen shows characteristic elongated prismatic formation.
Uses & applications
Primarily used as a high-value gemstone in jewelry and as a sought-after mineral specimen for collectors.
Geological facts
Imperial Topaz is the rarest and most valuable variety of topaz. Historically, it was believed only the Russian Tsar and his family were allowed to own it, giving it its 'Imperial' name.
Field identification & locations
Identify by its hardness (scratches glass/quartz), striations parallel to the long axis of the crystal, and heavy feel for its size. Most widely found in Ouro Preto, Brazil.
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