Hedenbergite Mineral Data

General Hedenbergite Information

Chemical Formula:

CaFe++Si2O6

Composition:

Molecular Weight = 248.09 gm

Calcium 16.15 % Ca 22.60 % CaO

Iron 22.51 % Fe 28.96 % FeO

Silicon 22.64 % Si 48.44 % SiO₂

Oxygen 38.69 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaFe²⁺Si₂O₆

Environment:

Contact metasomatic rocks.

IMA Status:

Valid Species (Pre-IMA) 1819

Locality:

Nordmark, Sweden. Link to MinDat.org Location Data.

Name Origin:

Named after the Swedish mineralogist, M. A. L. Hedenberg.

Name Pronunciation:

Hedenbergite + Pronunciation

Synonym:

ICSD 10226

PDF 41-1372

Hedenbergite Image

Images:

Hedenbergite

Comments: Thick, bluish gray blocky prisms of hedenbergite on matrix.
Location: Harstig mine, Pajsberg, Varmland, Sweden. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Hedenbergite Ilvaite

Comments: Doubly terminated, black ilvaite on crystals of greenish gray hedenbergite with minor galena.
Location: First Sovietsky mine, Dalnjegorsk, Russia. Scale: 4 x 2.8 x 1.8 cm.
© Fabre Minerals

Hedenbergite Crystallography

Axial Ratios:

a:b:c =1.0926:1:0.5849

Cell Dimensions:

a = 9.827, b = 8.994, c = 5.261, Z = 4; beta = 105.52° V = 448.03 Den(Calc)= 3.68

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/c

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

By Intensity(I/I_o): 2.97(1), 2.53(0.5), 2.56(0.3),

Physical Properties of Hedenbergite

Cleavage:

{???} Perfect, {???} Indistinct

Color:

Brownish green, Gray green, Grayish black, Dark green, Black.

Density:

3.55

Diaphaneity:

Transparent to translucent to opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Hardness:

5-6 - Between Apatite and Orthoclase

Luminescence:

Non-fluorescent.

Luster:

Vitreous - Pearly

Streak:

white green

Optical Properties of Hedenbergite

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.023 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1981,KPDmeas= 0.2053,KC= 0.2027
Ncalc = 1.72 - 1.75

Optical Data:

Biaxial (+), a=1.699-1.739, b=1.705-1.745, g=1.728-1.757, bire=0.0180-0.0290, 2V(Calc)=56-72, 2V(Meas)=58-63. Dispersion distinct to strong, r > v.

Pleochroism (x):

purplish green, pale bluish green, dark bluish green, or deep green.

Pleochroism (y):

pinkish purple, pale green, or bluish green.

Calculated Properties of Hedenbergite

Electron Density:

Bulk Density (Electron Density)=3.49 gm/cc
note: Specific Gravity of Hedenbergite =3.55 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Hedenbergite= 9.53 barns/electron
U=PE_Hedenbergite x rElectron Density= 33.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Hedenbergite is Not Radioactive

Hedenbergite Classification

Dana Class:

65.01.03a.02 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.01)with chains P=2

(65.01.03a)C2/c clinopyroxenes (Ca clinopyroxenes)

65.01.03a.01 Diopside CaMgSi2O6 C 2/c 2/m

65.01.03a.02 Hedenbergite CaFeSi2O6 C 2/c 2/m

65.01.03a.03 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

65.01.03a.04 Johannsenite CaMnSi2O6 C 2/c 2/m

65.01.03a.05 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

65.01.03a.06 Esseneite CaFeAlSiO6 C 2/c 2/m

65.01.03a.07 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m

Strunz Class:

09.DA.15 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DA -Inosilicates with 2-periodic single chains, Si2O6; pyroxene family

09.DA.15 Augite (Ca,Na)(Mg,Fe,Al,Ti)(Si,Al)2O6 C 2/c 2/m

09.DA.15 Esseneite CaFeAlSiO6 C 2/c 2/m

09.DA.15 Diopside CaMgSi2O6 C 2/c 2/m

09.DA.15 Johannsenite CaMnSi2O6 C 2/c 2/m

09.DA.15 Hedenbergite CaFeSi2O6 C 2/c 2/m

09.DA.15 Petedunnite Ca(Zn,Mn,Fe,Mg)Si2O6 C 2/c 2/m

09.DA.15 Davisite! Ca(Sc,Ti,Mg,Ti)AlSiO6 C 2/c 2/m

Other Hedenbergite Information

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Hedenbergite

CaFe++Si2O6
Dana No: 65.01.03a.02 Strunz No: 09.DA.15
Locality:

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