Carminite Mineral Data

General Carminite Information

Chemical Formula:

PbFe+++2(AsO4)2(OH)2

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

Empirical Formula:

Pb_1.06Co_0.01Cu_0.01Fe³⁺_1.9Al_0.02(AsO₄)₂(OH)_2.03

Environment:

Found as an uncommon alteration product of arsenopyrite in some oxidized lead-bearing mineral deposits.

IMA Status:

Valid Species (Pre-IMA) 1850

Locality:

Ojuela mine, Mapimï¿½I, Mexico. Link to MinDat.org Location Data.

Name Origin:

Named for the characteristic carmine color.

Name Pronunciation:

Carminite + Pronunciation

Synonym:

ICSD 81118

PDF 39-1355

Carminite Image

Images:

Carminite

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

Axial Ratios:

a:b:c =2.1887:1:1.6207

Cell Dimensions:

a = 16.591, b = 7.58, c = 12.285, Z = 8; V = 1,544.96 Den(Calc)= 5.50

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/I_o): 3.2(1), 2.58(0.9), 2.929(0.8),

Physical Properties of Carminite

Cleavage:

{100} Distinct

Color:

Carmine red, Reddish brown.

Density:

5.03 - 5.22, Average = 5.12

Diaphaneity:

Translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Lath - Shaped like a small, thin plaster lath, tabular (rectangular) in shape.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Pearly

Streak:

reddish yellow

Optical Properties of Carminite

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

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.

Pleochroism (x):

pale yellowish red.

Pleochroism (y):

dark carmine.

Pleochroism (z):

dark carmine.

Calculated Properties of Carminite

Electron Density:

Bulk Density (Electron Density)=4.91 gm/cc
note: Specific Gravity of Carminite =5.50 gm/cc.

Fermion Index:

Fermion Index = 0.07
Boson Index = 0.93

Photoelectric:

PE_Carminite= 613.15 barns/electron
U=PE_Carminite x rElectron Density=3,008.40 barns/cc.

Radioactivity:

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

Carminite Classification

Dana Class:

41.10.06.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.10)where (A++ B++)3 (XO4)2 Zq

(41.10.06)Carminite Group

41.10.06.01 Carminite PbFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m

41.10.06.02 Sewardite! CaFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m

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

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

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
15 - WWW-MINCRYST

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Print or Cut-and-Paste your Carminite Specimen Label here :

Carminite

PbFe+++2(AsO4)2(OH)2
Dana No: 41.10.06.01 Strunz No: 08.BH.30
Locality:

Notes:

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