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Tetradymite

Field	Value
name	Tetradymite
category	Sulfide mineral
image	Tetradymite.jpg
caption	Tetradymite - British Columbia, Canada
imagesize	260px
formula	Bi2Te2S
IMAsymbol	Ttd
strunz	2.DC.05c
dana	02.11.07.01
system	Trigonal
class	Hexagonal scalenohedral (m)
H-M symbol: ( 2/m)
symmetry	Rm
color	Steel-gray with dull to iridescent tarnish; white in polished section
habit	Pyramidal prisms, commonly granular, massive to foliated, also bladed
twinning	Twin planes {0118} and {0115}
cleavage	Perfect on {0001}
fracture	Uneven
tenacity	Laminae flexible, slightly sectile.
mohs	1.52
luster	Metallic, splendent on fresh surfaces, dull if tarnished
streak	Steel-gray
diaphaneity	Opaque
gravity	7.27.9
references

H-M symbol: ( 2/m) | length fast/slow =

Tetradymite is a mineral consisting of bismuth, tellurium and sulfide, Bi2Te2S, also known as telluric bismuth. If sulfur is absent the mineral is tellurobismuthite and the formula is then Bi2Te3. Traces of selenium are usually present.

Crystals are rhombohedral, but are rarely distinctly developed; they are twinned together in groups of four; hence the name of the mineral, from the Greek for fourfold. There is a perfect cleavage parallel to the basal plane and the mineral usually occurs in foliated masses of irregular outline. The color is steel-gray, and the luster metallic and brilliant. The mineral is very soft (H = 1.52) and marks paper. The specific gravity is 7.2 to 7.9.

The type locality is Zupkov (Zsubko; Schubkau), Stredoslovenský Kraj, Slovak Republic where it was reported in 1831. It was first found, in 1815, at Telemark in Norway. It often occurs in high temperature hydrothermal quartz veins associated with native gold and in contact metamorphic deposits.

References

Attribution:

References

Warr, L.N.. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine.
[https://www.mineralienatlas.de/lexikon/index.php/MineralData?mineral=Tetradymite Mineralienatlas]
http://rruff.geo.arizona.edu/doclib/hom/tetradymite.pdf Handbook of Mineralogy
http://webmineral.com/data/Tetradymite.shtml Webmineral data
http://www.mindat.org/min-3921.html Mindat.org

Info: Wikipedia Source

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bismuth-minerals telluride-minerals sulfide-minerals tetradymite-group trigonal-minerals glances minerals-in-space-group-166 minerals-described-in-1831

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