Mineralogy Database

Chapmanite Mineral Data

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General Chapmanite Information

Help on Chemical  Formula: Chemical Formula: Sb+++Fe+++2(SiO4)2(OH)
Help on Composition: Composition: Molecular Weight = 434.62 gm
   Iron      25.70 %  Fe   36.74 % Fe2O3
   Silicon   12.92 %  Si   27.65 % SiO2
   Antimony  28.01 %  Sb   33.54 % Sb2O3
   Hydrogen   0.23 %  H     2.07 % H2O
   Oxygen    33.13 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: SbFe3+2(SiO4)2(OH)
Help on Environment: Environment: Intimately associated with silver ores. Antimomy analog to bismutoferrite.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1924
Help on Locality: Locality: Keeley Mine is South Lorrain near Cobalt, Ontaario, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after the Canadian mineralogist, E. J. Chapman (1821-1904).
Help on Synonym: Synonym: ICSD 87100
  PDF 11-135

Chapmanite Image

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Comments: Green, earthy chapmanite on quartz-sulfide matrix.
Location: Neue Hoffnung Gottes Mine, Bräunsdorf, Freiberg District, Erzgebirge, Saxony, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Chapmanite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5773:1:0.8565
Help on Cell Dimensions: Cell Dimensions: a = 5.19, b = 8.99, c = 7.7, Z = 2; beta = 100.67° V = 353.06 Den(Calc)= 4.09
Help on Crystal System: Crystal System: Monoclinic - Domatic H-M Symbol (m) Space Group: Cm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.58(1), 7.63(0.9), 3.19(0.9),3.88(0.8), 2.59(0.7), 2.9(0.7), 2.54(0.3), 4.17(0.3),

Physical Properties of Chapmanite

Help on Color: Color: Yellowish green, Yellow, Olive green.
Help on Density: Density: 3.58 - 3.7, Average = 3.64
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.
Help on Habit: Habit: Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).
Help on Habit: Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: yellowish green

Optical Properties of Chapmanite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.094 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2249,KPDmeas= 0.2527,KC= 0.2484
Ncalc = 1.89 - 2.02
Help on Optical Data: Optical Data: Biaxial (-), a=1.85, b=1.95, g=1.96, bire=0.1100, 2V(Calc)=32, 2V(Meas)=small. Dispersion none.
Help on Pleochroism (x): Pleochroism (x): none.
Help on Pleochroism (y): Pleochroism (y): none.
Help on Pleochroism (z): Pleochroism (z): none.

Calculated Properties of Chapmanite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.42 gm/cc
note: Specific Gravity of Chapmanite =3.64 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEChapmanite = 96.25 barns/electron
U=PEChapmanite x rElectron Density= 328.91 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chapmanite is Not Radioactive

Chapmanite Classification

Help on  Dana Class: Dana Class: (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.01)with 1:1 layers
  (71.01.03)Bismutoferrite group Bismutoferrite BiFe2(SiO4)2(OH) Cm m Chapmanite SbFe2(SiO4)2(OH) Cm m
Help on  Strunz Class: Strunz Class: 09.ED.25 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.ED -Phyllosilicates with kaolinite layers
09.ED.25 Bismutoferrite BiFe2(SiO4)2(OH) Cm m
09.ED.25 Chapmanite SbFe2(SiO4)2(OH) Cm m

Other Chapmanite Information

Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(Dana8) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Chapmanite :
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

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Dana No: Strunz No: 09.ED.25





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