Inesite

Inesite is a hydrous calcium manganese silicate mineral.[4]  Its chemical formula is Ca2Mn7Si10O28(OH)2•5(H2O). Inesite is an inosilicate with a triclinic crystal system. It has a Mohs hardness of 5.5 to 6, and a specific gravity of 3.0. Its name originates from the Greek Ίνες (ines), "fibers" in allusion to its color and habit. [2]

Inesite
Inesite Crystals from Fengjishan Mine (Daye Copper Mine), Edong Mining District, Daye County, Huangshi Prefecture, Hubei Province, China.
General
CategoryInosilicates
Formula
(repeating unit)
Ca2Mn7Si10O28(OH)2•5(H2O)
Strunz classification09.DL.05
Dana classification66.3.3.1
Crystal systemTriclinic
Space groupP1 (no.2)
Identification
ColorRose red, pink, orange-pink, orange-red-brown
Crystal habitMassive, fibrous, radial, spherical
CleavagePerfect
FractureIrregular/Uneven
TenacityBrittle
Mohs scale hardness5.5 - 6
LusterVitreous, Silky
StreakWhite
DiaphaneityTranslucent
Specific gravity3.0
Ultraviolet fluorescenceNon-fluorescent
Common impuritiesFe, Al, Mg, K
References[1][2][3]

Occurrence and distribution

Inesite occurs in hydrothermal replacement deposits of manganese-rich metamorphic rocks and serpentines.[5]  It was first described in 1887 at Hilfe Gottes Mine, Oberscheld, Dillenburg, Dillenburg District, Hesse, Germany. Outside of the type locality, there are several notable localities of inesite, such as:[6][7]

  • Fengjishan Mine (Daye Copper Mine), Edong Mining District, Daye County, Huangshi Prefecture, Hubei Province, China.

References

  1. Dave Barthelmy. "Inesite Mineral Data". webmineral.com. Retrieved 2019-01-26.
  2. "Inesite: Mineral information, data and localities". mindat.org. Retrieved 2019-01-26.
  3. Wan, C.; Ghose, S. (1978). "Inesite, a hydrated calcium manganese silicate with five-tetrahedral-repeat double chains". American Mineralogist. 63: 563–571.
  4. Chesterman, Charles (1978). The Audubon Society Field Guide to North American Rocks And Minerals. Knopf. p. 592.
  5. The Mineral Inesite
  6. "Inesite" (PDF). 18 August 2001. Retrieved 26 January 2019.
  7. http://www.minsocam.org/ammin/AM53/AM53_1614.pdf Inesite From the Broken Hill Lode, New South Wales, Australia
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