Mineral Information and Data:

Babingtonite
Ca2Fe2+Fe3+Si5O14(OH) [CNMNC approved formula]

Named after the Irish physicist and mineralogist, W. Babington (1757-1833).

IMA status : Valid species (Pre-IMA 1824) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
65.04.01.02  
  (65) Inosilicate Single-Width Unbranched Chains, W=1
  (65.04) with chains P=5
  (65.04.01) Rhodonite group
  
Nickel-Strunz
(10th edition) :
09.DK.05
  (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
Unit cell: a = 7.5Å, b = 12.18Å, c = 6.68Å; α = 86.3°, β = 93.59°, γ = 112.19°
Crystal Habit: Stubby, prismatic, striated crystals, to 3 cm; also platy and as sub-parallel aggregates.
  
Color: Dark greenish black
Diaphaneity: Opaque to faintly translucent
Luster: Vitreous
Hardness (Mohs): 5.5 - 6
Measured Density: 3.34 - 3.37 g/cm3
Cleavage: Perfect on {001}, good on{010} and {100}
Tenacity: Brittle
Fracture: Uneven
  
Polymorphism and Series: Forms a series with manganbabingtonite.
Geologic Setting: In veins cutting granite pegmatite and diorite; in cavities and vugs in mafic volcanic rocks and gneisses; in skarns.
Mineral Association: Prehnite, calcite, epidote, albite, orthoclase, garnet, quartz, "hornblende", zeolites.
  

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