Frohbergite

Frohbergite
Frohbergite (Arizona)
General
CategoryTelluride (sulfosalt) mineral
Formula
(repeating unit)
FeTe2[1]
IMA symbolFrb
Strunz classification2.EB.10a[1]
Crystal systemOrthorhombic
Crystal classsulphide
Identification
Colorwhite with a lilac or pinkish tint[2]
Crystal habitin the form of a thin border or small inclusions
Cleavagethe mineral is fragile
Mohs scale hardness3-4,[2] up to 4.5[3]
Lustermetallic
Diaphaneityopaque[2]
Density8.057 (calculated)[1]
8.055 (measured)[4]
Pleochroismextremely weak.[2]

Frohbergite (German: Frohbergit, title by proper name: Max Hans Frohberg), also iron telluride is a rare hydrothermal mineral from the sulfide class, in composition — iron telluride with the ideal formula FeTe2 (contains 82.05% tellurium and 17.95% iron).

Frohbergite occurs in tellurium-rich veins of hydrothermal deposits, sometimes as a thin rim on the periphery of chalcopyrite or as inclusions in native gold, petzite or chalcopyrite. It belongs to the marcasite group and forms a mineral line with mattagamite. Frohbergite most often occurs as fine-grained aggregates.[5]: 93 

  1. ^ a b c Frohbergite (A valid IMA mineral species, grandfathered): information about the mineral frohbergite in the Mindat database.
  2. ^ a b c d John W. Anthony, Richard A. Bideaux, Kenneth W. Bladh, Monte C. Nichols (Hrsg.): Handbook of Mineralogy, Mineralogical Society of America. 2001. — Frohbergite: page in Handbook of mineralogy
  3. ^ Frohbergite on the website Mineralienatlas (in German)
  4. ^ Frohbergite (Фробергит): Geowikipedia page. (in Russian)
  5. ^ Bezsmertnaya M. S., Logikova L. A., Soboleva L. N. Determination of tellurides under a microscope. — Moscow: Nauka, 1969. — 175 p. (in Russian)

Developed by StudentB