Lorandite

Infobox mineral
name = Lorandite
category = Sulfosalt mineral
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formula = TlAsS₂
molweight =
color = red to carmine-red, lead grey
habit = Prismatic tabular striated parallel to [001]
system = Monoclinic prismatic 2/m
twinning =
cleavage = [100] perfect, [001] distinct
fracture = Conchoidal
mohs = 2.0 - 2.5
luster = Sub metallic - adamantine
refractive = nα = 2.720
opticalprop = Biaxial (+)
birefringence =
pleochroism = Weak; Y = purple-red; Z = orange-red
streak = Cherry-red
gravity = 5.5288 - 5.5362
melt =
fusibility =
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solubility =
diaphaneity = Subtransparent
other = Tenacity: flexible, forming cleavage lamellae and fibers
references = http://rruff.geo.arizona.edu/doclib/hom/lorandite.pdf Handbook of Mineralogy] [http://webmineral.com/data/Lorandite.shtml Webmineral] [http://www.mindat.org/min-2434.html Mindat]

Lorandite is a thallium arsenic sulfosalt with formula: TlAsS₂. Though rare, it is the most common thallium bearing mineral. Lorandite occurs in low temperature hydrothermal associations. Occurs in gold and mercury ore deposits. Associated minerals include stibnite, realgar, orpiment, cinnabar, vrbaite, greigite, marcasite, pyrite, tetrahedrite, antimonian sphalerite, arsenic and barite.

It was first discovered at Alshar, Republic of Macedonia in 1894 and named after Loránd Eötvös, physicist at the University of Budapest.

See also

* Hutchinsonite

References