Bismutinite – Wikipedia

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From Wikipedia, Liberade Libera.

Bismutinite
Strunz classification 2.DB.05
Chemical formula With a 2 S 3
Crystallographic properties
Crystalline group trimetric
Crystalline system ortorombic [first] [2] , rombico [3]
Symmetry class Dipiramidale [first] [2]
Cell parameters a = 11,13, b = 11,27, c = 3,97 [first] , a = 11,12, b = 11,25, c = 3,97 [2]
Punctual group 2/m 2/m 2/m [first] [2]
Space group PBNM [first] [2]
Physical properties
Density 6.75-6.81, 6.8 [3] , 6.8 [first] [2] -7.2 [first] g/cm³
Hardness (mohs) 2 [3] [first] [2] -2.5 [2]
Flaking perfect [3] [first] [2] According to {010} [first] [2] , weak according to {100} and {110} [2]
Fracture irregular, fragile [first]
Color Lead gray with a touch of white tin [3] , grey [first] , white tin [first] , silver white [first] , from gray lead to white tin [2] , tin gray with yellow or bluish shades
Shine metallica [first] [2]
Opacity matt [first] [2]
Strip grey [first] brilliant, lead gray [2]
Spread never [3]
It is invited to follow the scheme of Model – Mineral model
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The Bismutinite It is a mineral, a bismuto sulfide.
The name derives from its chemical composition [first] [2] , it is also called bismutina .
Described for the first time by James Dwight Dana (1813–1895) mineralogist, US zoologist and geologist in 1868.

Elongated prisms, wrinkled longitudinals.

The origin can be different: primary is essentially hydrothermal; Secondary, on the other hand, can be pegmatitic or metasomatic contact.

The mineral is located in some metalliferous deposits, associated with pyrite, arsenopirite, native bismuto, or with tin-wolframary minerals, etc. and also in the pegmatites [3] .

It presents itself in crystals, more often in lamellar and granular rooted aggregates.
In often striated crystals [3] .

It is flexible and septile (easily cut into thin lamina). It blends on the flame of candle; It splashes and merges to the torch. Soluble in HNO 3 [3] , in hot hcl and in the bases. Form a white precipitate by diluting with h 2 O.

  • Molecular weight: 514.16 GM [first]
  • Formioni index: 0.00114040467 [first]
  • Bosoni index: 0.9985959533 [first]
  • Photo Electricity: 1572.72 Barn/Electron [first]
  • Anisotropism: strong, especially in oil [2]
  • reflectivity [2] :
    • 400nm R first = 35.7% R2 = 46.2%
    • 420nm R first = 36.4% R2 = 47.2%
    • 440nm R first = 37.2% R2 = 47.9%
    • 460nm R first = 37.7% R2 = 48.3%
    • 480nm R first = 37.7% R2 = 48.8%
    • 500nm R first = 37.6% R2 = 49.4%
    • 520nm R first = 37.3% R2 = 49.6%
    • 540nm r first = 37.1% R2 = 49.1%
    • 560nm R first = 36.9% R2 = 48.7%
    • 580nm R first = 36.8% R2 = 48.3%
    • 600nm R first = 36.6% R2 = 47.8%
    • 620nm R first = 36.4% R2 = 47.3%
    • 640nm R first = 36.3% R2 = 46.8%
    • 660nm R first = 36.1% R2 = 46.3%
    • 680nm R first = 36.0% R2 = 45.8%
    • 700nm R first = 35.9% R2 = 45.4%

In Schneeberg and Bad Lobenstein, Germany; Beautiful crystals in Tasna, in Bolivia; in Băița, in Romania; And in Cerro de Pasco, in Peru.
In Italy in long crystals is included in the Siderite of the Mine of Brosso in the province of Turin, associated with Calcopirite in the Baitello mine near Pisogne, in the province of Brescia; in crystals within the pegmatite in Prata Camportaccio, in the province of Sondrio.
It is found included in the Pyrite of the Mine of Boccheggiano, municipality of Montieri, in the province of Grosseto.
Strongly antimoniferi specimens are located in the Falcacci construction site, in Rio Marina, on the island of Elba.
Finally, in Sardinia it is found in traces, together with a native bismuto in the mines of Gerra S’Liolioni and Fenugu Sibiri, in Gonnosfanadiga, in the province of South Sardinia.

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Extraction of the bismuto. It is the main compound from which it is extracted [ without source ] .

The horobhetsuite and a variety of encompassing antimonicisms.

  • ( IN ) Webmin . are webmineral.com .

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