Phyllotungstite Picture width 0.8 mm. Collection and photograph Christian Rewitzer. Locality: Alcantarilla mine, Belalcázar, Córdoba, Andalusia, Spain — Photo: Christian Rewitzer · CC BY-SA 3.0
Phyllotungstite
Phyllotungstite is an IMA-recognized mineral species in the tungstate class, with the chemical formula HCaFe³⁺₃(WO₄)₆·10H₂O.
It crystallizes in the orthorhombic crystal system.
Key properties: Mohs hardness 2; specific gravity 4.03; Pale yellow streak; Pearly luster; optically biaxial.
IMA symbol Ptgs, IMA status: approved, named in 1984.
A rare secondary mineral found in the oxidized zone of a hydrothermal polymetallic barite–fluorite deposit.
It is found associated with Ferritungstite, scheelite, pyrite, fluorite, hematite, quartz.
Its name comes from the Greek for leaf, reflecting its crystal habit, and tungsten in its composition.