Imperial Topaz
74 in the gallery
Imperial Topaz is a gem variety of topaz, recognized for its orange to pink-orange color and vitreous luster. Crystals are typically orthorhombic and can occur as prismatic, well-formed shapes, sometimes displaying a transparent to translucent appearance. High-quality examples are prized for their rich hue and clarity, often exhibiting a classic historic appeal in museum and collection displays.
- Formula
- Al2SiO4(F,OH)2
- Rarity
- Rare
- Stability
- Stable
- Collector interest
- Very High Interest
- Classification notes
- Silicates; Nesosilicates; Topaz variety - orange to pink-orange gem topaz (Ouro Preto type)
Key characteristics
- Crystal system
- orthorhombic
- Mohs hardness
- 8
- Specific gravity
- 3.49–3.57
- Luster
- vitreous
- Transparency
- transparent, translucent
- Color
- orange, yellow, pink, red
- Streak
- colorless
- Cleavage
- perfect
- Fracture
- subconchoidal, uneven
- Crystal habit
- prismatic
- Gem mineral
- Classic / historic
Where Imperial Topaz is found
Top localities
- Ouro Preto56 specimens
- Vermelhão Mine2 specimens
About Imperial Topaz
Notable specimens come from Brazil, with additional important sources in the Democratic Republic of the Congo and Zambia, where topaz crystals have been recovered from pegmatites and associated hydrothermal pockets. The Ouro Preto region in Brazil is especially associated with bright orange-to-pinkish specimens that have historically captivated collectors. Imperial Topaz is sought after for its color stability, relatively strong hardness, and rarity among orange topaz forms, making it a standout centerpiece for display and study.