Sky blue crystals of the extremely rare tellurium mineral graemite from a locality in Arizona (Dome Rock Mountains, La Paz County, Arizona, United States of America). Ex Vandenbroucke Museum collection specimen, from Waregem, Belgium. — Photo: David Hospital · CC BY-SA 4.0
Graemite
Graemite is an IMA-recognized mineral species in the oxides & hydroxide class, with the chemical formula Cu²⁺(Te⁴⁺O₃)·H₂O.
It crystallizes in the orthorhombic crystal system (space group Pcmm).
Key properties: Mohs hardness 3–3.5; specific gravity 4.13; Pale blue-green streak; [Vitreous.] luster; optically biaxial.
IMA symbol Gmi, IMA status: approved, named in 1974.
A rare dehydration product of teineite, as pseudomorphs and incrustations.
It is found associated with Teineite, malachite, cuprite (Cole mine, Arizona, USA); teineite, malachite, brochantite, djurleite, bornite, weissite, gold, goethite (Dome Rock Mountains.
The mineral was named to honor Richard Graeme (1941–), American mining engineer and mineral collector, Phelps Dodge Corporation, USA, who found the first specimen.