Babingtonite Mineral Data

Babingtonite Mineral Data +

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General Babingtonite Information

Chemical Formula:

Ca2(Fe++,Mn)Fe+++Si5O14(OH)

Composition:

Molecular Weight = 573.05 gm

Calcium 13.99 % Ca 19.57 % CaO

Manganese 2.40 % Mn 3.09 % MnO

Iron 17.05 % Fe 21.94 % FeO

Silicon 24.51 % Si 52.43 % SiO₂

Hydrogen 0.18 % H 1.57 % H₂O

Oxygen 41.88 % O

______ ______

100.00 % 98.60 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe²⁺_0.75Mn²⁺_0.25Fe²⁺Si₅O₁₄(OH)

IMA Status:

Valid Species (Pre-IMA) 1824

Locality:

Link to MinDat.org Location Data.

Name Origin:

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

Synonym:

ICSD 2932

PDF 45-1385

Babingtonite Image

Images:

Babingtonite

Comments: Small, single crystal of babingtonite on matrix.
Location: Blueberry Mountain, Woburn. Middlesex County, Massachusetts, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Babingtonite Crystallography

Axial Ratios:

a:b:c =0.6388:1:0.5711

Cell Dimensions:

a = 7.36, b = 11.52, c = 6.58, Z = 2; alpha = 91.516°, beta = 93.85°, gamma = 104.067° V = 539.76 Den(Calc)= 3.53

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.75(1), 2.87(0.8), 3.12(0.7),

Crystal Structure:

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Araki T , Zoltai T , Zeitschrift fur Kristallographie , 135 (1972) p.355-373, Crystal structure of babingtonite, Locality: Yakuki mine, Japan

Physical Properties of Babingtonite

Cleavage:

[100] Perfect, [001] Perfect

Color:

Brownish black, Greenish black, Black.

Density:

3.4

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

5.5-6 - Knife Blade-Orthoclase

Luminescence:

None.

Luster:

Vitreous (Glassy)

Streak:

brown

Optical Properties of Babingtonite

Gladstone-Dale:

CI meas= -0.063 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2076,KPDmeas= 0.2156,KC= 0.2028

Optical Data:

Biaxial (+), a=1.717, b=1.73, g=1.752, bire=0.0350, 2V(Calc)=76, 2V(Meas)=60-65. Dispersion relatively strong.

Pleochroism (x):

none.

Pleochroism (y):

none.

Pleochroism (z):

non.

Calculated Properties of Babingtonite

Electron Density:

r_electron=3.48 gm/cc
note: r_Babingtonite=3.53 gm/cc.

Fermion Index

Fermion Index = 0.01544
Boson Index = 0.98456

Photoelectric:

PE_Babingtonite= 8.31 barns/electron
U=PE_Babingtonite x r_electron= 28.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Babingtonite is Not Radioactive

Babingtonite Classification

Dana Class:

65.4.1.2 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.4)with chains P=5

(65.4.1)Rhodonite group

65.4.1.1 Rhodonite (Mn,Fe,Mg,Ca)SiO3 P1 1

65.4.1.2 Babingtonite Ca2(Fe,Mn)FeSi5O14(OH) P1 1

65.4.1.3 Manganbabingtonite Ca2(Mn,Fe)FeSi5O14(OH) P1 1

65.4.1.4 Nambulite (Li,Na)Mn4[Si5O14(OH)] P1 1

65.4.1.5 Natronambulite (Na,Li)Mn4[Si5O14(OH)] P1 1

65.4.1.6 Marsturite NaCaMn3[Si5O14(OH)] P1,P 1 Tri

65.4.1.7 Lithiomarsturite LiCa2Mn2HSi5O15 P1 1

65.4.1.8 Scandiobabingtonite! Ca2(Fe,Mn)ScSi5O14(OH) P1 1

Strunz Class:

VIII/F.27-20 VIII - Silicates

VIII/F - Inosilicates (chain and band) Five chains [Si5O15]10-

VIII/F.27 - Rhodonite - Inesite series

VIII/F.27-10 Rhodonite (Mn,Fe,Mg,Ca)SiO3 P1 1

VIII/F.27-20 Babingtonite Ca2(Fe,Mn)FeSi5O14(OH) P1 1

VIII/F.27-30 Manganbabingtonite Ca2(Mn,Fe)FeSi5O14(OH) P1 1

VIII/F.27-35 Scandiobabingtonite! Ca2(Fe,Mn)ScSi5O14(OH) P1 1

VIII/F.27-40 Santaclaraite CaMn4Si5O14(OH)2·(H2O) P1 1

VIII/F.27-50 Nambulite (Li,Na)Mn4[Si5O14(OH)] P1 1

VIII/F.27-60 Natronambulite (Na,Li)Mn4[Si5O14(OH)] P1 1

VIII/F.27-70 Lithiomarsturite LiCa2Mn2HSi5O15 P1 1

VIII/F.27-80 Marsturite NaCaMn3[Si5O14(OH)] P1,P 1 Tri

VIII/F.27-90 Inesite Ca2Mn7Si10O28(OH)2·5(H2O) P1 1

Other Babingtonite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Babingtonite

Ca2(Fe++,Mn)Fe+++Si5O14(OH)
Dana No: 65.4.1.2 Strunz No: VIII/F.27-20
Locality:

Notes: