Mineral Information and Data:

Carpholite
Mn2+Al2Si2O6(OH)4 [CNMNC approved formula]

Named from the Greek karfos - "straw" and lithos - "stone.".

IMA status : Valid species (Pre-IMA 1817) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
65.01.05.01  
  (65) Inosilicate Single-Width Unbranched Chains, W=1
  (65.01) with chains P=2
  (65.01.05) Carpholite group
  
Nickel-Strunz
(10th edition) :
09.DB.05
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DB) with 2-periodic single chains, Si2O6; Pyroxene-related minerals
  
Crystal system: Orthorhombic System
Point group (H-M): mmm (or 2/m 2/m 2/m) — dipyramidal
Unit cell: a = 13.83Å, b = 20.31Å, c = 5.13Å
Crystal Habit: Crystals acicular, prismatic; fibrous, as radiated tufts, to 2 cm.
Twinning: On {100}
  
Color: Yellow
Diaphaneity: Semi-transparent
Luster: Silky, glistening
Hardness (Mohs): 5.5 - 6
Measured Density: 2.935 - 3.031 g/cm3
Cleavage: Perfect on {010}
Tenacity: Very brittle
  
Polymorphism and Series: Forms a series with ferrocarpholite.
Geologic Setting: In low-grade metamorphosed shales.
Mineral Association: Sudoite, manganoan garnet, chlorotoid, fluorite
  

 

Carpholite
Origin: Schlaggenwald, Bohemia, Czech Republic
Sample size: 7 x 4 x 3 cm
Photo: Dan Weinrich

 

Carpholite
(zoom-in of above)

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