Chalcosiderite Mineral Data

Chalcosiderite Mineral Data +

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General Chalcosiderite Information

Chemical Formula:

CuFe+++6(PO4)4(OH)8·4(H2O)

Composition:

Molecular Weight = 986.63 gm

Iron 33.96 % Fe 43.69 % FeO

Copper 6.44 % Cu 8.06 % CuO

Phosphorus 12.56 % P 28.77 % P₂O₅

Hydrogen 1.63 % H 14.61 % H₂O

Oxygen 45.41 % O

______ ______

100.00 % 95.14 % = TOTAL OXIDE

Empirical Formula:

CuFe²⁺₆(PO₄)₄(OH)₈·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1814

Locality:

Link to MinDat.org Location Data.

Synonym:

Andrewsite

ICSD 67037

PDF 37-446

Chalcosiderite Image

Images:

Chalcosiderite

Comments: Pale bluish transparent crystal of chalcosiderite on matrix.
Location: Cornwall, England. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Chalcosiderite Crystallography

Axial Ratios:

a:b:c =0.7524:1:0.774

Cell Dimensions:

a = 7.66, b = 10.18, c = 7.88, Z = 1; alpha = 112.483°, beta = 115.3°, gamma = 69° V = 479.22 Den(Calc)= 3.42

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.77(1), 3.39(0.7), 3.02(0.6),

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Forms: [ 1 3 0] [ 1 1 0] [ 0 1 0] [ 1 1 1] [ 1 0 0] [ 0 0 1]

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Crystal Structure:

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Giuseppetti G , Mazzi F , Tadini C , Neues Jahrbuch fur Mineralogie, Monatshefte , 1989 (1989) p.227-239, The crystal structure of chalcosiderite, CuFe3+6(PO4)4(OH)8*4H2O, Locality: Wheal Phoenix Mine, Cornwall, England

Physical Properties of Chalcosiderite

Cleavage:

[001] Perfect, [0101] Good

Color:

Apple green, Dark green.

Density:

3.1

Diaphaniety:

Transparent to Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

4.5 - Between Fluorite and Apatite

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Chalcosiderite

Gladstone-Dale:

CI meas= -0.34 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.215 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2407,KPDmeas= 0.2656,KC= 0.1982

Optical Data:

Biaxial (-), a=1.775, b=1.84, g=1.855, bire=0.0800, 2V(Calc)=48, 2V(Meas)=22. Dispersion relatively strong.

Calculated Properties of Chalcosiderite

Electron Density:

r_electron=3.36 gm/cc
note: r_{Chalcosiderite}=3.42 gm/cc.

Fermion Index

Fermion Index = 0.00742
Boson Index = 0.99258

Photoelectric:

PE_{Chalcosiderite}= 13.47 barns/electron
U=PE_{Chalcosiderite} x r_electron= 45.28 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chalcosiderite is Not Radioactive

Chalcosiderite Classification

Dana Class:

42.9.3.4 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.3)Dana Group

42.9.3.1 Turquoise CuAl6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.2 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8·4-5(H2O) P1 1

42.9.3.3 Faustite (Zn,Cu)Al6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.4 Chalcosiderite CuFe6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.5 Aheylite (Fe,Zn)Al6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.6 Planerite Al6(PO4)2(PO3OH)2(OH)8·4(H2O) P1 1

Strunz Class:

VII/D.15-60 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.15 - Turquoise group

VII/D.15-10 Planerite Al6(PO4)2(PO3OH)2(OH)8·4(H2O) P1 1

VII/D.15-20 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8·4-5(H2O) P1 1

VII/D.15-30 Aheylite (Fe,Zn)Al6(PO4)4(OH)8·4(H2O) P1 1

VII/D.15-40 Turquoise CuAl6(PO4)4(OH)8·4(H2O) P1 1

VII/D.15-50 Faustite (Zn,Cu)Al6(PO4)4(OH)8·4(H2O) P1 1

VII/D.15-60 Chalcosiderite CuFe6(PO4)4(OH)8·4(H2O) P1 1

Other Chalcosiderite Information

References:

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

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Chalcosiderite

CuFe+++6(PO4)4(OH)8·4(H2O)
Dana No: 42.9.3.4 Strunz No: VII/D.15-60
Locality:

Notes: