Luetheite Mineral Data

Luetheite Mineral Data +

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General Luetheite Information

Chemical Formula:

Cu2Al2(AsO4)2(OH)4·(H2O)

Composition:

Molecular Weight = 544.94 gm

Aluminum 9.90 % Al 18.71 % Al₂O₃

Copper 23.32 % Cu 29.19 % CuO

Arsenic 27.50 % As 42.18 % As₂O₅

Hydrogen 1.11 % H 9.92 % H₂O

Oxygen 38.17 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂Al₂(AsO₄)₂(OH)₄·(H₂O)

IMA Status:

Approved IMA 1977

Locality:

Link to MinDat.org Location Data.

Luetheite Image

Images:

Luetheite

Comments: Blue to greenish crystalline luetheite crust on altering rock matrix.
Location: Patagonia, Santa Cruz County, Arizona, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Luetheite Crystallography

Axial Ratios:

a:b:c =2.8947:1:1.0991

Cell Dimensions:

a = 14.743, b = 5.093, c = 5.598, Z = 2; beta = 101.817° V = 411.42 Den(Calc)= 4.40

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 3.498(1), 7.208(0.7), 2.507(0.5),

Crystal Structure:

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Burns P C , Smith J V , Steele I M , Mineralogical Magazine , 64 (2000) p.25-30, Arizona porphyry copper/hydrothermal deposits I., The structure of chenevixite and luetheite, Note: Luetheite-chenevixite series, Locality: Humboldt mine, Patagonia, Arizona

Physical Properties of Luetheite

Cleavage:

[100] Distinct

Color:

Blue, Greenish, Light green.

Density:

4.28

Fracture:

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

Hardness:

3 - Calcite

Optical Properties of Luetheite

Gladstone-Dale:

CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.076 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.176,KPDmeas= 0.1809,KC= 0.1904

Optical Data:

Biaxial (-), a=1.752, b=1.775, g=1.796, bire=0.0440, 2V(Calc)=86, 2V(Meas)=88.

Calculated Properties of Luetheite

Electron Density:

r_electron=4.08 gm/cc
note: r_Luetheite=4.28 gm/cc.

Fermion Index

Fermion Index = 0.00018
Boson Index = 0.99982

Photoelectric:

PE_Luetheite= 29.28 barns/electron
U=PE_Luetheite x r_electron= 119.57 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Luetheite is Not Radioactive

Luetheite Classification

Dana Class:

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

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.10)Dana Group

42.7.10.1 Chenevixite Cu2Fe2(AsO4)2(OH)4·(H2O) P 2₁/m 2/m

42.7.10.2 Luetheite Cu2Al2(AsO4)2(OH)4·(H2O) P 2₁/m 2/m

Strunz Class:

VII/D.16-10 VII - Phosphates, Arsenates and Vanadates

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

VII/D.16 - Luetheite - Akrochordite series

VII/D.16-10 Luetheite Cu2Al2(AsO4)2(OH)4·(H2O) P 2₁/m 2/m

VII/D.16-20 Chenevixite Cu2Fe2(AsO4)2(OH)4·(H2O) P 2₁/m 2/m

VII/D.16-30 Akrochordite Mn4Mg(AsO4)2(OH)4·4(H2O) P 2₁/c 2/m

Other Luetheite Information

References:

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

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

Luetheite

Cu2Al2(AsO4)2(OH)4·(H2O)
Dana No: 42.7.10.2 Strunz No: VII/D.16-10
Locality:

Notes: