Deep pink microcrystals of the extremely rare mineral guarinoite from the type locality (Cap Garonne Mine, Le Pradet, Var, Provence-Alpes-Cote d'Azur, France) and one of the only two known localities worldwide. The mineral is one of the most sought after species from Cap Garonne. The species is a Co-Zn-Ni sulphate. — Photo: David Hospital · CC BY-SA 4.0
Guarinoite
Guarinoite is an IMA-recognized mineral species in the sulfate class, with the chemical formula Zn₆(SO₄)(OH)₁₀·5H₂O.
It crystallizes in the hexagonal crystal system. It is a member of the Guarinoite structural group.
Key properties: specific gravity 2.8; Pale pink streak; Vitreous to pearly luster; optically uniaxial.
IMA symbol Gua, IMA status: approved, named in 1991.
Found as a secondary mineral in the oxidized portions of a polymetallic sulfide deposit.
It is found associated with Anglesite, antlerite, cobaltoan-nickeloan ktenasite, cerussite, brochantite, covellite, tennantite, gersdorffite, thérèsemagnanite, rutile, quartz.
The mineral was named to honor André Guarino (1945–), mineral collector and medical technologist, Toulon, France, who first collected the mineral.