Sursassite

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Sursassite
General
Category Sorosilicate
Formula
(repeating unit)
Mn2+2Al3(SiO4)(Si2O7)(OH)3
Strunz classification 09.BG.15
Identification
Color Red-brown to copper-red
Crystal habit Botryoidal
Crystal system Monoclinic
Cleavage [101] Distinct
Mohs scale hardness 3
Luster Silky, Dull
Streak yellow-brown
Diaphaneity Translucent
Density 3.256
Optical properties Biaxial
Refractive index 1.73 to 1.76
Birefringence 0.030
Pleochroism

Strong; X = Z = colorless to pale yellow; Y = deep

golden brown.
Dispersion r > v
References [1][2]

Sursassite is a sorosilicate mineral. It was first discovered in 1926.[3] It was first found in the Sursass (Oberhalbstein), a district of Graubünden, Switzerland. It is generally found in deposits of metamorphosed manganese.[4]

Notes[edit]

  1. ^ Pierre Perroud. "Sursassite". Athena Mineralogy: Mineral Data. 
  2. ^ Sursassite details from Handbook of Mineralogy
  3. ^ Schweizerische mineralogische und petrographische Mitteilungen (1926), 6, 376-380.
  4. ^ Barthelmy, Dave. "Sursassite Mineral Data". WebMineral. Retrieved 2009-03-17.