Mineralogy Database

Pigeonite Mineral Data

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General Pigeonite Information

Help on Chemical  Formula: Chemical Formula: (Mg,Fe++,Ca)(Mg,Fe++)Si2O6
Help on Composition: Composition: Molecular Weight = 219.70 gm
   Calcium     1.82 %  Ca    2.55 % CaO
   Magnesium  14.93 %  Mg   24.77 % MgO
   Iron       13.98 %  Fe   17.99 % FeO
   Silicon    25.57 %  Si   54.70 % SiO2
   Oxygen     43.69 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mg1.35Fe2+0.55Ca0.1Si2O6
Help on Environment: Environment: Common in rapidly cooled siliceous volcanic rocks. Inverted varieties with exsolved augite are found in layered mafic intrusives. From metamorphosed iron formations.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1900
Help on Locality: Locality: Pigeon Point, Cook Co., Minnesota Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Pigeonite + Pronunciation Say PIGEONITE
Help on Synonym: Synonym: ICSD 15197
  PDF 13-421

Pigeonite Image

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Comments: Dark green prismatic pigeonite crystals in matrix.
Location: Belmont Quarry, Louden County, Virginia, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Pigeonite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.0844:1:0.5861
Help on Cell Dimensions: Cell Dimensions: a = 9.706, b = 8.95, c = 5.246, Z = 4; beta = 108.59° V = 431.94 Den(Calc)= 3.38
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.9(1), 3.02(1), 3.21(0.8),

Physical Properties of Pigeonite

Help on Cleavage: Cleavage: {110} Good
Help on Color: Color: Brown, Greenish brown, Light purple brown, Black.
Help on Density: Density: 3.3 - 3.46, Average = 3.38
Help on Diaphaneity: Diaphaneity: Translucent to Subopaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Hardness: Hardness: 6 - Orthoclase
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: gray white

Optical Properties of Pigeonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.039 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.039 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2104,KPDmeas= 0.2104,KC= 0.2025
Ncalc = 1.67 - 1.7
Help on Optical Data: Optical Data: Biaxial (+), a=1.683-1.722, b=1.684-1.722, g=1.704-1.752, bire=0.0210-0.0300, 2V(Calc)=0-26, 2V(Meas)=0-32. Dispersion weak to distinct, r < v.
Help on Pleochroism (x): Pleochroism (x): colorless, faint pink, pink, or pale greenish brown.
Help on Pleochroism (y): Pleochroism (y): colorless, faint pink, brownish pink, or pale greenish brown.
Help on Pleochroism (z): Pleochroism (z): colorless, faint green, pale green, or pale reddish brown.

Calculated Properties of Pigeonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.34 gm/cc
note: Specific Gravity of Pigeonite =3.38 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEPigeonite = 5.66 barns/electron
U=PEPigeonite x rElectron Density= 18.89 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Pigeonite is Not Radioactive

Pigeonite Classification

Help on  Dana Class: Dana Class: (65)Inosilicate Single-Width Unbranched Chains, W=1
  (65.01)with chains P=2
  (65.01.01)P2/c clinopyroxenes Clinoenstatite Mg2Si2O6 P 21/c 2/m Clinoferrosilite (Fe,Mg)2Si2O6 P 21/c 2/m Kanoite (Mn,Mg)2Si2O6 P 21/c 2/m Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 09.DA.10 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.10 Clinoenstatite Mg2Si2O6 P 21/c 2/m
09.DA.10 Clinoferrosilite (Fe,Mg)2Si2O6 P 21/c 2/m
09.DA.10 Kanoite (Mn,Mg)2Si2O6 P 21/c 2/m
09.DA.10 Pigeonite (Mg,Fe,Ca)(Mg,Fe)Si2O6 P 21/c 2/m

Other Pigeonite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Heinrich65)
Help on See Also: See Also: Links to other databases for Pigeonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - UCLA - Petrography Thin-Sections

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Dana No: Strunz No: 09.DA.10





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