Patrónite

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Patronite
Patrónite - Mineralogisches Museum Bonn.jpg
Patronite from the Minas Ragra, Peru
General
Category Sulfide mineral
Formula
(repeating unit)
VS4
Strunz classification 2.EC.10
Crystal system Monoclinic
Crystal class Prismatic (2/m)
(same H-M symbol)
Space group I2/c
Unit cell a = 12.11 Å, b = 10.42 Å,
c = 6.78 Å; β = 100.8°; Z = 8
Identification
Formula mass 179.21 g/mol
Color Lead-gray on fresh surfaces to gray-black after exposure to air
Crystal habit Occurs as columnar crystal aggregates and in massive form
Cleavage Distinct columnar
Mohs scale hardness 2
Luster Metallic
Streak Black
Diaphaneity Opaque
Specific gravity 2.82
Pleochroism Strong
References [1][2][3][4]

Patronite is the vanadium sulfide mineral with formula VS4. The material is usually described as V4+(S22−)2.[5] Structurally, it is a "linear-chain" compound with alternating bonding and nonbonding contacts between the vanadium centers. The vanadium is octa-coordinated, which is an uncommon geometry for this metal.[6]

The mineral was first described in 1906 for an occurrence in a vanadium mine near Mina Ragra, Junín, Cerro de Pasco, Peru. It was named for Peruvian metallurgist Antenor Rizo-Patron (1866–1948) the discoverer of the deposit.[2][3] At the type locality in Peru it occurs in fissures within a red shale likely derived from an asphaltum deposit. Associated minerals include, native sulfur, bravoite, pyrite, minasragrite, stanleyite, dwornikite, quartz and vanadium bearing lignite.[3] It has also been reported from the Yushkinite gorge on the Middle Silova-Yakha River on the Paikhoi Range of the polar Urals of Russia and from the Tsumeb mine in Namibia.[2]

References[edit]

  1. ^ Mineralienatlas
  2. ^ a b c Mindat.org
  3. ^ a b c Handbook of Mineralogy
  4. ^ Webmineral data
  5. ^ Vaughan, D. J.; Craig, J. R. “Mineral Chemistry of Metal Sulfides" Cambridge University Press, Cambridge: 1978. ISBN 0-521-21489-0.
  6. ^ Allmann, R.; Baumann, I.; Kutoglu, A.; Rosch H.; Hellner E. (1964). "Die Kristallstruktur des Patronits V(S2)2". Naturwissenschaften. 51: 263–264. Bibcode:1964NW.....51..263A. doi:10.1007/BF00638454.