Andorite

{{Short description|Sulfosalt mineral}}

{{Infobox mineral

| name = Andorite

| category = Sulfosalt mineral

| image = Andorite - Itos Mine, Oruro City, Cercado, Oruro Department, Bolivia.jpg

| imagesize = 260px

| alt =

| caption = Andorite – Itos Mine, Oruro City, Cercado Province, Bolivia. Specimen height is 4.1 cm.

| formula = PbAgSb₃S₆

|IMAsymbol=Ado{{Cite journal|last=Warr|first=L.N.|date=2021|title=IMA–CNMNC approved mineral symbols|journal=Mineralogical Magazine|volume=85|issue=3|pages=291–320|doi=10.1180/mgm.2021.43|bibcode=2021MinM...85..291W|s2cid=235729616|doi-access=free}}

| strunz = 2.JB.40a

| system = Orthorhombic

| class = Pyramidal (mm2)
H-M symbol: (mm2)

| symmetry = Pn2₁a
(andorite VI, senandorite)

| unit cell = a = 12.99, b = 19.14, c = 4.3 [Å]; Z = 4

| color = Dark steel-gray, may tarnish yellow or iridescent; white in polished section

| habit = Crystals stout prismatic to tabular on {100}, striations parallel to [001]; massive

| twinning = On {110}

| cleavage = none observed

| fracture = conchoidal

| mohs = 3 – 3.5

| luster = metallic

| polish =

| refractive =

| opticalprop = anisotropic

| birefringence =

| dispersion =

| pleochroism =

| fluorescence=

| absorption =

| streak = Black

| gravity = 5.33 – 5.37

| density =

| melt =

| fusibility =

| diagnostic =

| solubility =

| diaphaneity = Opaque

| other =

| references = {{Cite web|title=Andorite: Mindat mineral information and data.|url=http://www.mindat.org/min-222.html|year=2010|accessdate=5 February 2010| archiveurl= https://web.archive.org/web/20100121035043/http://www.mindat.org/min-222.html| archivedate= 21 January 2010 | url-status= live}}[http://rruff.geo.arizona.edu/doclib/hom/andorite.pdf Handbook of Mineralogy]

}}

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).{{Cite web|title=Andorite Mineral Data|url=http://www.webmineral.com/data/Andorite.shtml|year=2010|accessdate=5 February 2010| archiveurl= https://web.archive.org/web/20100117191004/http://webmineral.com/data/Andorite.shtml| archivedate= 17 January 2010 | url-status= live}} 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.