Thunderbayite
Thunderbayite is an IMA-recognized mineral species in the sulfosalt class, with the chemical formula TlAg₃Au₃Sb₇S₆.
It crystallizes in the triclinic crystal system (space group P1).
Key properties: Mohs hardness 3; specific gravity 5.693; Black streak; Metallic luster.
IMA symbol Tby, IMA status: approved, named in 2020.
Found in a metamorphosed, stratiform, hydrothermal gold deposit in volcano-sedimentary rocks near a shear zone.
It is found associated with Aurostibite, stibarsen, biagioniite, native gold, calcite.
The name refers to the Thunder Bay district, Ontario, where the Hemlo gold deposit is located.
Index entry. This entry combines official IMA/RRUFF species data with published physical-property data — a full written entry hasn’t been published yet.
Browse more T minerals or help write this entry.