Teallite Locality: Carguaicollo Mine (Carguaycollo Mine; Carhuaycollo Mine), Antonio Quijarro Province , Potosí Department , Bolivia ( Locality at mindat.org ) Size: 3.2 x 2.5 x 2.3 cm. Teallite is a rare lead, tin sulfosalt and this rich and showy specimen is from an uncommon mine - the Carguaicollo Mine of Bolivia. Splendent, lamellar lathes of teallite cover all sides of this striking, rich piece. Very rare in this richness and quality. Ex. Wes Parker Collection. — Photo: Robert M. Lavinsky · CC BY-SA 3.0
Teallite
A lead-tin sulfide forming soft gray mica-like plates — a minor tin ore.
Intro adapted from Wikipedia (CC BY-SA).
Teallite is an IMA-recognized mineral species in the sulfide class, with the chemical formula PbSnS₂.
It crystallizes in the orthorhombic crystal system (space group Pnma). It is a member of the Arsenolamprite structural group.
Key properties: Mohs hardness 1.5; specific gravity 6.36; Black streak; Metallic luster.
IMA symbol Tel, grandfathered status — known before the IMA’s founding, named in 1904.
A hydrothermal mineral in tin veins; may be an important ore mineral.
It is found associated with Cassiterite, stannite, franckeite, cylindrite, galena, sphalerite, wurtzite, pyrite.
The mineral was named to honor Jethro Justinian Harris Teall (1849–1924), Director of the Geological Survey of Great Britain and Ireland.