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)

Environment:

A rare mineral in the oxidized zone of some hydrothermal mineral deposits. Forms a series with turquoise.

IMA Status:

Valid Species (Pre-IMA) 1814

Locality:

West Phoenix mine, Cornwall, England. Link to MinDat.org Location Data.

Name Origin:

Named from the Greek for copper and iron, for those elements in the mineral’s composition.

Name Pronunciation:

Chalcosiderite + Pronunciation

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),

Forms:

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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

Diaphaneity:

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= -0.267 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.251,KPDmeas= 0.2656,KC= 0.1982
Ncalc = 1.61 - 1.65

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:

Bulk Density (Electron Density)=3.22 gm/cc
note: Specific Gravity of Chalcosiderite =3.28 gm/cc.

Fermion Index:

Fermion Index = 0.0074203754
Boson Index = 0.9925796246

Photoelectric:

PE_{Chalcosiderite}= 13.47 barns/electron
U=PE_{Chalcosiderite} x rElectron Density= 43.43 barns/cc.

Radioactivity:

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

Chalcosiderite Classification

Dana Class:

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

(42.09)where (A)3 (XO4)2 Zq · x(H2O)

(42.09.03)Turquoise Group

42.09.03.01 Turquoise CuAl6(PO4)4(OH)8•4(H2O) P1 1

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

42.09.03.03 Faustite (Zn,Cu)Al6(PO4)4(OH)8•4(H2O) P1 1

42.09.03.04 Chalcosiderite CuFe6(PO4)4(OH)8•4(H2O) P1 1

42.09.03.05 Aheylite (Fe,Zn)Al6(PO4)4(OH)8•4(H2O) P1 1

42.09.03.06 Planerite Al6(PO4)2(PO3OH)2(OH)8•4(H2O) P1 1

Strunz Class:

08.DD.15 08 - PHOSPHATES, ARSENATES, VANADATES

08.D - Phosphates, etc

08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1

08.DD.15 Aheylite (Fe,Zn)Al6(PO4)4(OH)8•4(H2O) P1 1

08.DD.15 Chalcosiderite CuFe6(PO4)4(OH)8•4(H2O) P1 1

08.DD.15 Faustite (Zn,Cu)Al6(PO4)4(OH)8•4(H2O) P1 1

08.DD.15 Planerite Al6(PO4)2(PO3OH)2(OH)8•4(H2O) P1 1

08.DD.15 Turquoise CuAl6(PO4)4(OH)8•4(H2O) P1 1

Other Chalcosiderite Information

References:

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

See Also:

Links to other databases for Chalcosiderite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Chalcosiderite

CuFe+++6(PO4)4(OH)8•4(H2O)
Dana No: 42.09.03.04 Strunz No: 08.DD.15
Locality:

Notes: