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Carminite Mineral Data

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General Carminite Information

Help on Chemical  Formula: Chemical Formula: PbFe+++2(AsO4)2(OH)2
Help on Composition: Composition: Molecular Weight = 639.87 gm
   Aluminum   0.08 %  Al    0.16 % Al2O3
   Iron      16.58 %  Fe   23.71 % Fe2O3
   Cobalt     0.09 %  Co    0.12 % CoO
   Copper     0.10 %  Cu    0.12 % CuO
   Arsenic   23.42 %  As   35.92 % As2O5
   Hydrogen   0.32 %  H     2.86 % H2O
   Lead      34.32 %  Pb   36.97 % PbO
   Oxygen    25.08 %  O
            ______        ______ 
            100.00 %       99.86 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb1.06Co0.01Cu0.01Fe3+1.9Al0.02(AsO4)2(OH)2.03
Help on Environment: Environment: Found as an uncommon alteration product of arsenopyrite in some oxidized lead-bearing mineral deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1850
Help on Locality: Locality: Ojuela mine, Mapim�I, Mexico. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the characteristic carmine color.
Help on Name Pronunciation: Name Pronunciation: Carminite + Pronunciation Say CARMINITE
Help on Synonym: Synonym: ICSD 81118
  PDF 39-1355

Carminite Image

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Comments: Brownish red carminite crystals in matrix.
Location: San Rafael mine, Gabbs, Nye County, Nevada, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Carminite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =2.1887:1:1.6207
Help on Cell Dimensions: Cell Dimensions: a = 16.591, b = 7.58, c = 12.285, Z = 8; V = 1,544.96 Den(Calc)= 5.50
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: C ccm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.2(1), 2.58(0.9), 2.929(0.8),

Physical Properties of Carminite

Help on Cleavage: Cleavage: {100} Distinct
Help on Color: Color: Carmine red, Reddish brown.
Help on Density: Density: 5.03 - 5.22, Average = 5.12
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: reddish yellow

Optical Properties of Carminite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.078 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1933,KPDmeas= 0.2075,KC= 0.1925
Ncalc = 1.97 - 2.06
Help on Optical Data: Optical Data: Biaxial (+), a=2.05-2.07, b=2.05-2.07, g=2.06-2.08, bire=0.0100, 2V(Calc)=0, 2V(Meas)=medium. Dispersion r > v strong.
Help on Pleochroism (x): Pleochroism (x): pale yellowish red.
Help on Pleochroism (y): Pleochroism (y): dark carmine.
Help on Pleochroism (z): Pleochroism (z): dark carmine.

Calculated Properties of Carminite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.91 gm/cc
note: Specific Gravity of Carminite =5.50 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PECarminite = 613.15 barns/electron
U=PECarminite x rElectron Density=3,008.40 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Carminite is Not Radioactive

Carminite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.10)where (A++ B++)3 (XO4)2 Zq
  (41.10.06)Carminite Group Carminite PbFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m Sewardite! CaFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.BH.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BH -With medium-sized and large cations, (OH,etc.):RO4 = 1:1
08.BH.30 Carminite PbFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m
08.BH.30 Sewardite! CaFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m

Other Carminite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: See Also: Links to other databases for Carminite :
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: 08.BH.30





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