Sphalerite

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Sphalerite
Sphalerite-Dolomite-Chalcopyrite-165227.jpg
Sphalerite on dolomite frae the Tri-State District, Jasper Coonty, Missouri, USA
General
Category Sulfide meeneral
Formula
(repeatin unit)
(Zn,Fe)S
Strunz clessification 02.CB.05a
Dana clessification 02.08.02.01
Creestal seestem Isometric hextetrahedral (4 3m)
Identification
Colour Broun, yellae, reid, green, black.
Creestal habit Euhedral crystals – occurs as well-formed crystals shawin guid external form. Granular – generally occurs as anhedral tae subhedral crystals in matrix.
Twinnin Simple contact twins or complex lamellar forms, twin axis [111]
Cleavage perfect
Fractur Uneven tae conchoidal
Mohs scale haurdness 3.5-4
Skinkle Adamantine, resinous, greasy
Streak brounish white, fauch yellae
Diaphaneity Skyre tae leamish, opaque whan iron-rich
Speceefic gravity 3.9–4.2
Optical properties Isotropic
Refractive index nα = 2.369
Ither chairacteristics non-radioactive, non-magnetic, fluorescent an triboluminescent.
References [1][2][3]

Sphalerite ((Zn,Fe)S) is a meeneral that is the chief ore o zinc. It consists lairgely o zinc sulfide in crystalline furm but naur aye contains variable iron. Whan iron content is heich it is an opaque black variety, marmatite. It is uisually foond in association wi galena, pyrite, an ither sulfides alang wi calcite, dolomite, an fluorite. Whiles, miners refer tae sphalerite as zinc blende, black-jack, an ruby jack.

References[eedit | eedit soorce]

  1. Sphalerite. Webmineral. Retrieved on 2011-06-20.
  2. Sphalerite. Mindat.org. Retrieved on 2011-06-20.
  3. Handbook of Mineralogy