Luzonite

luzonite

famatinite

enargite

stannoidite

Images

Formula: Cu₃AsS₄
Likely valence: Cu¹⁺₃As⁵⁺S^2-₄
Sulpharsenate, stannite group, paramorph of enargite, forms a series with famatinite
Specific gravity: 4.4 to 4.6
Hardness: 3½
Streak: Black
Colour: Deep pinkish brown
Common impurities: Sb
Environments

Hydrothermal environments

Luzonite is a primary mineral in hydrothermal copper-arsenic-antimony rich veins and disseminated deposits, formed at low to medium temperatures. Associated minerals include enargite, tetrahedrite–tennantite, colusite, stannoidite, pyrite, chalcopyrite, covellite, sphalerite, bismuthinite, silver sulfosalts, silver, gold, marcasite, alunite, baryte and quartz (AM 42.766-779, HOM).

Localities

At the Clara Mine, Oberwolfach, Ortenaukreis, Freiburg Region, Baden-Württemberg, Germany, pinkish metallic luzonite pseudo-octahedra occur on altered dark fahlore (A series between tennantite subgroup and tetrahedrite subgroup minerals) (Mindat photo).
Luzonite from the Clara Mine - Image

The type Locality is the Lepanto mine, Mancayan mineral district, Benguet Province, Cordillera Administrative Region, Luzon, Philippines.
Luzonite from the Lepanto Mine - Image

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