Melonite

melonite

altaite

petzite

calaverite

Images

Formula: NiTe2
Telluride, melonite group, forms a series with merenskyite

Varieties

Palladian melonite is a palladium-rich variety of melonite

Properties

Specific gravity: 7.3
Hardness: 1 to 1½
Streak: Dark grey
Colour: White, reddish white
Common impurities: Pd,Pt,Ag,Bi
Environments

Hydrothermal environments

Melonite is found with other tellurium minerals in the late stages of hydrothermal veins formed at moderate to low temperatures. Also in high temperature magmatic sulphide deposits (Webmin). Associated minerals include altaite, petzite, hessite, calaverite, coloradoite, krennerite, tellurobismuthite, montbrayite, gold, pyrite, chalcopyrite, pentlandite and pyrrhotite (HOM).

Localities

At the Golden Mile mines, Kalgoorlie-Boulder, Kalgoorlie-Boulder Shire, Western Australia, melonite is fairly abundant as an accessory mineral in telluride assemblages, as blebs in calaverite and krennerite (AJM 18.1.14)

At the Emperor Mine, Vatukoula, Vatukoula Gold Field, Viti Levu, Fiji, melonite has been found as rare particles to 20 microns associated with chalcopyrite, sylvanite and hessite, and as inclusions in sylvanite and tellurium (Min Rec 39-4.299)

The type locality is the Stanislaus mine, Carson Hill Gold Mining Company Mines, Melones, Carson Hill Mining District, Mother Lode Belt, Calaveras county, California, USA.

At the Cresson Mine, Eclipse Gulch, Cripple Creek Mining District, Teller county, Colorado, USA, melonite has been found as overgrowths on calaverite, which is partly replaced by melonite and native gold (Min Rec 36-2.174).

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