Arthurite Mineral Data

General Arthurite Information

Chemical Formula:

CuFe+++2(AsO4,PO4,SO4)2(O,OH)2•4(H2O)

Composition:

Molecular Weight = 531.49 gm

Iron 21.02 % Fe 30.05 % Fe₂O₃

Copper 11.96 % Cu 13.46 % Cu₂O

Arsenic 19.74 % As 30.27 % As₂O₅

Phosphorus 2.33 % P 5.34 % P₂O₅

Hydrogen 1.61 % H 14.41 % H₂O

Sulfur 1.21 % S 3.01 % SO₃

Oxygen 42.14 % O

______ ______

100.00 % 96.54 % = TOTAL OXIDE

Empirical Formula:

CuFe³⁺₂2(AsO₄)_0.72(PO₄)_0.22(SO₄)_0.1O_1.5(OH)_0.5ï¿½4(H₂O)

Environment:

Secondary mineral in the oxidation zone of some copper deposits, formed by the alteration of arsenopyrite or enargite.

IMA Status:

Approved IMA 1964

Locality:

Hingston Down Consols mine, Calstock, Cornwall, England. Link to MinDat.org Location Data.

Name Origin:

Named for Sir Arthur Edward Ian Montagu Russell (1878-1964) and Arthur William Gerald Kingsbury (1906-1968) for their contributions to British mineralogy.

Name Pronunciation:

Arthurite + Pronunciation

Synonym:

ICSD 100444

PDF 36-400

Arthurite Image

Images:

Arthurite Pharmacosiderite

Comments: Altered rhyolite vug lined with brilliant apple green arthurite and cubic green crystals of pharmacosiderite.
Location: Majuba Hill Mine, Pershing County, Nevada. USA. Scale: 2.7 x 1.7 cm.
© John Veevaert

Images:

Arthurite

Comments: Radiating sprays of acicular arthurite.
Location: Majuba Hill mine, Pershing County, Nevada, USA. Scale: Spray size 2.5 mm.
© Tom Loomis / Dakota Matrix

Arthurite Crystallography

Axial Ratios:

a:b:c =1.0488:1:0.5769

Cell Dimensions:

a = 10.09, b = 9.62, c = 5.55, Z = 2; beta = 92.2° V = 538.32 Den(Calc)= 3.28

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2₁/c

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

By Intensity(I/I_o): 4.28(1), 4.81(1), 6.97(1),

Physical Properties of Arthurite

Cleavage:

None

Color:

Apple green, Emerald green.

Density:

3.02

Diaphaneity:

Transparent

Fracture:

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

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Spherical - Spherical, rounded aggregates.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Arthurite

Gladstone-Dale:

CI meas= -0.061 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2336,KPDmeas= 0.2538,KC= 0.2393
Ncalc = 1.72 - 1.78

Optical Data:

Biaxial (+/-), a=1.736, b=1.767, g=1.796, bire=0.0600, 2V(Calc)=86, 2V(Meas)=~90.

Pleochroism (x):

colorless or pale green.

Pleochroism (y):

gray green.

Pleochroism (z):

olive green.

Calculated Properties of Arthurite

Electron Density:

Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Arthurite =3.28 gm/cc.

Fermion Index:

Fermion Index = 0.0047504247
Boson Index = 0.9952495753

Photoelectric:

PE_Arthurite= 25.00 barns/electron
U=PE_Arthurite x rElectron Density= 79.27 barns/cc.

Radioactivity:

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

Arthurite Classification

Dana Class:

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

(42.11)where (AB)4 (XO4)3 Zq ï¿½ x(H2O)

(42.11.18)Whitmoreite Group

42.11.18.01 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.02 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 2₁/c 2/m

42.11.18.03 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.04 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.05 Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13•H2O P 2₁/n 2/m

42.11.18.06 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

42.11.18.07 Kunatite CuFe2(PO4)2(OH)2•4H2O P 2₁/c 2/m

42.11.18.08 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 2₁/c 2/m

Strunz Class:

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

08.D - Phosphates, etc

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

08.DC.15 Earlshannonite (Mn,Fe)Fe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Arthurite CuFe2(AsO4,PO4,SO4)2(O,OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Ojuelaite ZnFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Whitmoreite FeFe2(PO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Cobaltarthurite! CoFe2(AsO4)2(OH)2•4(H2O) P 2₁/c 2/m

08.DC.15 Kunatite CuFe2(PO4)2(OH)2•4H2O P 2₁/c 2/m

08.DC.15 Bendadaite! FeFe2(AsO4)2(OH)2•4H2O P 2₁/c 2/m

Other Arthurite Information

References:

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

See Also:

Links to other databases for Arthurite :
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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Arthurite

CuFe+++2(AsO4,PO4,SO4)2(O,OH)2•4(H2O)
Dana No: 42.11.18.02 Strunz No: 08.DC.15
Locality:

Notes:

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