Image: <bdi><a href="https://www.wikidata.org/wiki/Q108103612" class="extiw" title="d:Q108103612"><span title="Wikipedian and OpenStreetMap mapper from Cologne, Open Data activist">Raimond Spekking</span></a></bdi> (CC BY-SA 4.0)
orthorhombicuncommonSilicates
Topaz
Al₂SiO₄(F,OH)₂
This image displays a large, well-formed, transparent crystal of topaz, exhibiting a pale blue to colorless hue and distinct crystal faces with a sharp termination.
Topaz Physical Properties
Mohs Hardness
8Crystal System
orthorhombicLuster
vitreousStreak Color
whiteCleavage
perfect basal (one direction)Fracture
conchoidalSpecific Gravity
3.49Colors
colorless, pale blue, yellow, orange, pink, brown, greenTransparency
transparentType Locality
Virgem da Lapa, Minas Gerais, BrazilMineral Group
SilicatesUses
jewelry, collector's specimensAssociated Minerals
quartz, feldspar, mica, fluorite, cassiterite, tourmaline, berylRarity
uncommonGeological Context
Topaz typically forms in igneous rocks, especially granitic pegmatites and rhyolites, and in high-temperature hydrothermal veins. It is also found in alluvial deposits due to its hardness and resistance to weathering.
