| Andorite | |
|---|---|
 Andorite – Itos Mine, Oruro City,Cercado Province, Bolivia. Specimen height is 4.1 cm. | |
| General | |
| Category | Sulfosalt mineral |
| Formula | PbAgSb3S6 |
| IMA symbol | Ado[1] |
| Strunz classification | 2.JB.40a |
| Crystal system | Orthorhombic |
| Crystal class | Pyramidal (mm2) H-M symbol: (mm2) |
| Space group | Pn21a (andorite VI, senandorite) |
| Unit cell | a = 12.99, b = 19.14, c = 4.3 [Å]; Z = 4 |
| Identification | |
| Color | Dark steel-gray, may tarnish yellow or iridescent; white in polished section |
| Crystal habit | Crystals stout prismatic to tabular on {100}, striations parallel to [001]; massive |
| Twinning | On {110} |
| Cleavage | none observed |
| Fracture | conchoidal |
| Mohs scale hardness | 3 – 3.5 |
| Luster | metallic |
| Streak | Black |
| Diaphaneity | Opaque |
| Specific gravity | 5.33 – 5.37 |
| Optical properties | anisotropic |
| References | [2][3] |
Andorite is asulfosaltmineral with the chemical formula PbAgSb3S6.
It was first described in 1892 for an occurrence in the Baia Sprie mine,Baia Sprie, in what is nowMaramureș County,Romania, and named for Hungarian amateur mineralogist Andor von Semsey (1833–1923).[2][4] Andorite occurs in low-temperaturepolymetallichydrothermal veins. It occurs associated withstibnite,sphalerite,baryte,fluorite,siderite,cassiterite,arsenopyrite,stannite,zinkenite,tetrahedrite,pyrite,alunite,quartz,pyrargyrite,stephanite andrhodochrosite.[3]
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