Mineral Information and Data:

Barysilite
Pb8Mn(Si2O7)3 [CNMNC approved formula]

Named from the Greek for heavy and for SILicon in its composition.

IMA status : Valid species (Pre-IMA 1888) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
55.02.03.01  
  (55) Sorosilicate Si2O7 Groups, Generally with No Additional Anions
  (55.02) with cations in [6] coordination
  (55.02.03)
  
Nickel-Strunz
(10th edition) :
09.BC.20
  (09) Silicates
  (09.B) Sorosilicates (dimer) structures
  (09.BC) Si2O7 groups, without non-tetrahedral anions; cations in octahedral [6] and greater coordination
  
Crystal system: Trigonal System
Point group (H-M): 3m (or 3 2/m) — hexagonal-scalenohedral
Space group: R3c
Unit cell: a = 9.8Å, c = 38.35Å
Crystal Habit: As platy, subparallel crystals in lamellar and ball-like aggregates, to 3 mm; granular, massive.
  
Color: Pink to colorless; tarnishes on exposure
Diaphaneity: Semitransparent
Luster: Pearly on cleavage
Hardness (Mohs): 3
Measured Density: 6.55 - 6.71 g/cm3
Cleavage: {0001}, perfect
Tenacity: Brittle
Fracture: Uneven
  
Geologic Setting: In iron ores (Harstigen mine, Sweden); as thin films and veinlets in a metamorphosed zinc orebody (Franklin, New Jersey, USA).
Mineral Association: Garnet, willemite, axinite, hardystonite (Franklin, New Jersey, USA)
  

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