T
- Teallite: PbSnS2 – British geologist Jethro Justinian Harris Teall (1849–1924)
- Tennantite: Cu12As4S13 – English chemist Smithson Tennant (1761–1815)
- Tenorite: CuO – Italian botanist Michele Tenore (1780–1861)
- Thomasclarkite: Na0.8Ce0.2Y0.5REE0.7(HCO3)(OH)3·4(H2O) – Canadian geologist Thomas Clark (1893–1996)
- Thortveitite: (Sc,Y)2Si2O7 – Norwegian engineer Olaus Thortveit
- Tiemannite: HgSe – Johann Carl Wilhelm Tiemann (1848–1899)
- Torbernite: CuAl(UO2)2(PO4)2·8-12H2O – Swedish chemist Torbern Bergman (1735–1784)
- Trevorite: NiFe2O4 – Major Tudor Gruffydd Trevor, mining inspector for the Pretoria District, Transvaal, South Africa
Read more about this topic: List Of Minerals Named After People