Andorite

Andorite
Andorite – Itos Mine, Oruro City, Cercado Province, Bolivia. Specimen height is 4.1 cm.
General
CategorySulfosalt mineral
FormulaPbAgSb3S6
IMA symbolAdo[1]
Strunz classification2.JB.40a
Crystal systemOrthorhombic
Crystal classPyramidal (mm2)
H-M symbol: (mm2)
Space groupPn21a
(andorite VI, senandorite)
Unit cella = 12.99, b = 19.14, c = 4.3 [Å]; Z = 4
Identification
ColorDark steel-gray, may tarnish yellow or iridescent; white in polished section
Crystal habitCrystals stout prismatic to tabular on {100}, striations parallel to [001]; massive
TwinningOn {110}
Cleavagenone observed
Fractureconchoidal
Mohs scale hardness3 – 3.5
Lustermetallic
StreakBlack
DiaphaneityOpaque
Specific gravity5.33 – 5.37
Optical propertiesanisotropic
References[2][3]

Andorite is a sulfosalt mineral with the chemical formula PbAgSb3S6.

It was first described in 1892 for an occurrence in the Baia Sprie mine, Baia Sprie, in what is now Maramureș County, Romania, and named for Hungarian amateur mineralogist Andor von Semsey (1833–1923).[2][4] Andorite occurs in low-temperature polymetallic hydrothermal veins. It occurs associated with stibnite, sphalerite, baryte, fluorite, siderite, cassiterite, arsenopyrite, stannite, zinkenite, tetrahedrite, pyrite, alunite, quartz, pyrargyrite, stephanite and rhodochrosite.[3]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b "Andorite: Mindat mineral information and data". 2010. Archived from the original on 21 January 2010. Retrieved 5 February 2010.
  3. ^ a b Handbook of Mineralogy
  4. ^ "Andorite Mineral Data". 2010. Archived from the original on 17 January 2010. Retrieved 5 February 2010.
Sharp crystals of andorite (to 7 mm) with stannite matrix, San José Mine, Oruro Department, Bolivia
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