Topaz is the iconic Mohs-8 reference mineral and a Chinese Sichuan signature. The Xuebaoding district produces the world reference for translucent colorless and pale-blue topaz crystals on milky quartz, often paired with cassiterite and beryl. Sichuan topaz – distinct from heat-treated commercial topaz – is the gem-collector standard.
Key Facts
- Mohs hardness 8 – the only common Mohs-8 mineral.
- Specific gravity 3.49-3.57 – distinguishes from quartz (2.65) by hand feel.
- Perfect basal {001} cleavage – terminations easily damaged.
- Sichuan Xuebaoding produces the world reference for collector topaz.
- Most commercial blue topaz is heat-treated colorless or pale stone.
Notable Varieties
- Imperial topaz (orange-pink)
- Sherry topaz (champagne)
- Sky-blue topaz
- Colorless topaz
The Chinese Angle
Xuebaoding Mine (Sichuan) is the world reference for collector-grade Chinese topaz – sharp pale-blue and colorless crystals on smoky quartz with cassiterite and beryl. Xianghualing in Hunan produces a secondary supply, often as smaller pale topaz crystals in pegmatite pockets. Both are untreated natural color.
Found at these Localities
- Eastern Brazilian Pegmatite Province (巴西东部伟晶岩省)
- Ural Emerald Mines (乌拉尔祖母绿矿)
- Volyn (Volodarsk-Volynskii) (沃伦伟晶岩区)
- Skardu / Shigar Valley (斯卡都/希加尔峡谷)
- Ouro Preto Region (欧鲁普雷图矿区)
- Xianghualing Mine (香花岭)
- Xuebaoding Mine (雪宝顶)
- Sichuan (四川)
- Hunan (湖南)
