Carminite Mineral Data

Carminite Mineral Data +

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General Carminite Information

Chemical Formula:

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

Composition:

Molecular Weight = 630.75 gm

Iron 17.71 % Fe 25.32 % Fe₂O₃

Arsenic 23.76 % As 36.44 % As₂O₅

Hydrogen 0.32 % H 2.86 % H₂O

Lead 32.85 % Pb 35.39 % PbO

Oxygen 25.37 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

PbFe³⁺₂(AsO₄)₂(OH)₂

IMA Status:

Valid Species (Pre-IMA) 1850

Locality:

Link to MinDat.org Location Data.

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)= 5.42

Crystal System:

Orthorhombic - DipyramidalH-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),

Crystal Structure:

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Finney J J , American Mineralogist , 48 (1963) p.1-13, The crystal structure of carminite

View Additional jPOWD Structure files for Carminite
[1] [2] [3] [4]

Physical Properties of Carminite

Cleavage:

[100] Distinct

Color:

Carmine red, Reddish brown.

Density:

5.22

Diaphaniety:

Translucent

Fracture:

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

Hardness:

3.5 - Copper Penny

Luster:

Vitreous - Pearly

Streak:

reddish yellow

Optical Properties of Carminite

Gladstone-Dale:

CI meas= -0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1962,KPDmeas= 0.2037,KC= 0.1956

Optical Data:

Biaxial (+), a=2.05-2.07, b=2.05-2.07, g=2.06-2.08, bire=0.0100

Calculated Properties of Carminite

Electron Density:

r_electron=4.85 gm/cc
note: r_Carminite=5.42 gm/cc.

Fermion Index

Fermion Index = 0.07647
Boson Index = 0.92353

Photoelectric:

PE_Carminite= 586.93 barns/electron
U=PE_Carminite x r_electron=2,844.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Carminite is Not Radioactive

Carminite Classification

Dana Class:

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

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

(41.10.6)Dana Group

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

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

Strunz Class:

VII/B.28-40 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.28 - Carminite series

VII/B.28-10 Bertossaite Li2CaAl4(PO4)4(OH)4 Imaa,Iaa2 Ortho

VII/B.28-20 Palermoite (Sr,Ca)(Li,Na)2Al4(PO4)4(OH)4 I mmm 2/m 2/m 2/m

VII/B.28-30 Attakolite (Ca,Sr)Mn(Al,Fe)4[(Si,P)O4]H(PO4)3(OH)4 C 2/m 2/m

VII/B.28-35 Sewardite! CaFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m

VII/B.28-40 Carminite PbFe2(AsO4)2(OH)2 C ccm 2/m 2/m 2/m

VII/B.28-60 Leningradite PbCu3(VO4)Cl2 I bam 2/m 2/m 2/m

VII/B.28-70 Namibite CuBi2(VO4)O2 C 2/m,Cm,C 2 Mono

VII/B.28-80 Paganoite! (Ni,Co)BiAsO5 P1 1

Other Carminite Information

References:

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

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Carminite

PbFe+++2(AsO4)2(OH)2
Dana No: 41.10.6.1 Strunz No: VII/B.28-40
Locality:

Notes: