Image: <bdi><a href="https://www.wikidata.org/wiki/Q56247090" class="extiw" title="d:Q56247090"><span title="mineral collector and dealer">Robert M. Lavinsky</span></a></bdi> (CC BY-SA 3.0)
orthorhombicuncommonSilicates
Topaz
Al2SiO4(F,OH)2
The image shows a transparent, well-formed, brownish-orange (sherry) topaz crystal with distinct crystal faces, likely terminated, and possibly associated with a dark, metallic mineral.
Topaz Physical Properties
Mohs Hardness
8Crystal System
orthorhombicLuster
vitreousStreak Color
whiteCleavage
perfect basal {001}Fracture
conchoidalSpecific Gravity
3.49Colors
brownish-orange, yellow, blue, pink, colorless, greenTransparency
transparentType Locality
Topaz Mountain, Thomas Range, Juab County, Utah, USAMineral Group
SilicatesUses
jewelry, collector's specimensAssociated Minerals
hematite, quartz, feldspar, fluoriteRarity
uncommonGeological Context
Topaz typically forms in igneous rocks, especially in granitic pegmatites and rhyolite lava flows, where it crystallizes in cavities or veins. It can also be found in high-temperature hydrothermal veins.
