mineral

Imperial Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

AI-generated identification · may be incorrect

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

Identified July 18, 2026More mineral →

Explore Imperial Topaz in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

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.