Mineral Information and Data:

Ca2Mn2+Fe3+Si5O14(OH) [CNMNC approved formula]

Named for the manganese content and relation to babingtonite. . First published in 1966.

IMA status : Approved Species 1971 ()
(8th edition) :  
  (65) Inosilicate Single-Width Unbranched Chains, W=1
  (65.04) with chains P=5
  (65.04.01) Rhodonite group
(10th edition) :
  (09) Silicates
  (09.D) Inosilicates* Structural terminology per Liebau (1985)
  (09.DK) with 5-periodic single chains
Crystal system: Triclinic System
Point group (H-M): 1 — pinacoidal
Space group: P1
Unit cell: a = 6.88Å, b = 11.80Å, c = 6.77Å, α = 90.50°, β = 93.50°, γ = 104.9°, Z=2
Crystal Habit: Crystals short prismatic, to 5 mm.
Color: Dark greenish black to yellowish green.
Diaphaneity: Translucent to opaque
Hardness (Mohs): 6.5 - 7
Measured Density: 3.452 g/cm3
Cleavage: Perfect on {001}, less perfect on {010}, poor on {100}
Tenacity: Brittle
Fracture: Subconchoidal
Polymorphism and Series: Forms a series with babingtonite.
Geologic Setting: In thin stringers in amphibolized garnet-pyroxene-magnetite skarn associated with an iron deposit (Rudnyi Kaskad deposit, Russia); replacing hedenbergite-johannsenite skarn (Iron Cap mine, Arizona, USA).
Mineral Association: Epidote, calcite, quartz (Rudnyi Kaskad deposit, Russia); ilvaite, andradite, epidote, thaumasite, calcite, quartz, pyrite, galena, sphalerite (Iron Cap mine, Arizona, USA)
Other Properties: Paramagnetic (weakly attracted to magnetic fields).
Comments: Paramagnetism very weak.


An open vug measuring 2 x 1 cm in size
lined with sparkling black micro manganbabingtonite crystals
set nicely on crystallized greenish johannsenite.
Origin: Iron Cap mine, Landsman Camp (Landsman group),
Aravaipa District, Pinaleno Mts, Graham Co., Arizona, U.S.A.
Sample size: 3.5 x 5 x 2.5 cm
Photo: Dan Weinrich


(zoom-in of above)