Tellurium

tellurium

gold

empressite

emmonsite

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Formula: Te
Native element, selenium group
Selen-tellurium is a selenium-bearing variety of tellurium.
Specific gravity: 6.1 to 6.3
Hardness: 2 to 2½
Streak: Grey
Colour: Tin-white
Melting point: 449.51°C
Boiling point: 988°C
Abundance in the earth’s crust: 1 part per billion by weight, 0.2 parts per billion by moles, which makes it one of the rarest stable solid elements (Wiki).
Environments

Volcanic fumeroles
Hydrothermal environments

Tellurium is a hydrothermal vein mineral, which may be of both primary and secondary origin, and also a sublimate in volcanic fumaroles. Associated minerals include native gold, sylvanite, empressite, altaite, pyrite, galena, alabandite, baryte, quartz and carbonates (HOM).

At the Emperor mine, Vatukoula, Viti Levu, Fiji, tellurium occurs as a component of massive ore intimately mixed with sulphides, tellurides and gold, and also as fine crystals up to 4 cm long in quartz cavities (Minrec 39.4.300-301).

The type locality is the Mariahilf Mine, Faţa Băii, Zlatna, Alba, Romania.

At mines in the Cripple Creek mining district, Colorado, USA, tellurite in the oxidised zone with emmonsite and native gold (Minrec 36.2.181).

Common impurities: Se,Fe,Bi,S

Tellurium-bearing minerals include:

Sulphides
nagyágite
tetradymite

Selenides
gachingite
kawazulite

Tellurides
altaite
borovskite
calaverite
cameronite
coloradoite
empressite
frohbergite
hedleyite
hessite
krennerite
mattagamite
melonite
merenskyite
michenerite
montbrayite
nagyagite
petzite
rickardite
stützite
sylvanite
tellurantimony
tellurobismuthite
telluropalladinite
vasilite
volynskite
vulcanite
weissite

Tellurobismuthides
kotulskite
moncheite
montbrayite

Sulphosalts

stibiogoldfieldite

Oxides
kuranakhite
tellurite
tewite

Sulphates
adanite
northstarite

Tellurates
Salts of telluric acid H6Te6+O6
andymcdonaldite
carlfriesite
eckhardite
frankhawthorneite
khinite
mcalpineite
wildcatite
xocolatlite

Tellurites
Salts of tellurous acid H2Te4+O3
blakeite
cliffordite
emmonsite
eztlite
mackayite
mroseite
poughite
rodalquilarite
schmitterite
sonoraite
spiroffite
tlapallite
teineite
yecoraite
zemannite

Unclassified silicates
burckhardtite

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