Cetineite Locality: Le Cetine di Cotorniano Mine (Le Cetine Mine; Cetine Mine; Rosia), Chiusdino, Siena Province, Tuscany, Italy Picture width 0.8 mm. Collection and photograph Christian Rewitzer — Photo: Christian Rewitzer · CC BY-SA 3.0
Cetineite
Cetineite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula NaK₅Sb₁₄S₆O₁₈(H₂O)₆.
It crystallizes in the hexagonal crystal system (space group P6_3). It is a member of the Cetineite structural group.
Key properties: specific gravity 4.21; Orange streak; Resinous luster; optically uniaxial.
IMA symbol Cet, IMA status: approved, named in 1986.
From an antimony deposit in highly silicified evaporites, on ore which has been roasted, then long weathered.
It is found associated with Mopungite, sénarmontite.
The name refers to the Cetine mine, Italy.