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Lorandite



Lorandite
CategorySulfosalt mineral
Chemical formulaTlAsS2
Identification
Colorred to carmine-red, lead grey
Crystal habitPrismatic tabular striated parallel to [001]
Crystal systemMonoclinic prismatic 2/m
Cleavage[100] perfect, [001] distinct
FractureConchoidal
Mohs Scale hardness2.0 - 2.5
LusterSub metallic - adamantine
Refractive indexnα = 2.720
Optical PropertiesBiaxial (+)
PleochroismWeak; Y = purple-red; Z = orange-red
StreakCherry-red
Specific gravity5.5288 - 5.5362
DiaphaneitySubtransparent
Other CharacteristicsTenacity: flexible, forming cleavage lamellae and fibers
References[1][2][3]

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.[1]

Additional recommended knowledge

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

See also

References

  1. ^ a b http://rruff.geo.arizona.edu/doclib/hom/lorandite.pdf Handbook of Mineralogy
  2. ^ http://webmineral.com/data/Lorandite.shtml Webmineral
  3. ^ http://www.mindat.org/min-2434.html Mindat
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Lorandite". A list of authors is available in Wikipedia.
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