Guanacoite Mineral Data

Guanacoite Mineral Data

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General Guanacoite Information

Chemical Formula:

Cu2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2

Composition:

Molecular Weight = 555.69 gm

Magnesium 12.03 % Mg 19.95 % MgO

Copper 25.73 % Cu 32.21 % CuO

Arsenic 26.97 % As 41.36 % As₂O₅

Hydrogen 0.73 % H 6.48 % H₂O

Oxygen 34.55 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂Mg₂Mg_0.75Cu_0.25(OH)₄(AsO₄)₂

Environment:

Isotypic with akrochordite

IMA Status:

Proposed IMA 2003 (Dana # Added)

Locality:

El Guanaco Mine, East Catalina, Chile, South America Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

IMA2003-021

Guanacoite Image

Images:

Guanacoite

Comments: Deep blue, bladed, glassy crystals of guanacoite to 0.75mm lining vugs of Arhbarite..
Location: El Guanaco Mine, Guanaco, Taltal, Antofagasta Province, Chile. Scale: Picture Size 5mm.
© Tom Loomis / Dakota Matrix

Guanacoite Crystallography

Axial Ratios:

a:b:c =0.3246:1:0.41

Cell Dimensions:

a = 5.475, b = 16.865, c = 6.915, Z = 2; beta = 99.8° V = 629.19 Den(Calc)= 2.93

Crystal System:

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

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

By Intensity(I/I_o): 8.42(1), 4.21(0.64), 4.32(0.21),3.016(0.12), 2.907(0.1), 2.809(0.07),

Physical Properties of Guanacoite

Color:

Blue.

Diaphaniety:

Transparent

Luster:

Vitreous (Glassy)

Optical Properties of Guanacoite

Gladstone-Dale:

CI calc= -0.27 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2332,KC= 0.1837

Optical Data:

Biaxial (-), a=1.664, b=1.691, g=1.695, bire=0.0310

Calculated Properties of Guanacoite

Electron Density:

r_electron=2.79 gm/cc
note: r_Guanacoite=2.93 gm/cc.

Fermion Index

Fermion Index = 0.01219
Boson Index = 0.98781

Photoelectric:

PE_Guanacoite= 30.04 barns/electron
U=PE_Guanacoite x r_electron= 83.71 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Guanacoite is Not Radioactive

Guanacoite Classification

Dana Class:

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

(42.4)where (AB)5 (XO4)2 Zq · x(H2O)

(42.4.1)Dana Group

42.4.1.1 Akrochordite Mn4Mg(AsO4)2(OH)4·4(H2O) P 2₁/c 2/m

42.4.1.2 Guanacoite ! Cu2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 2₁/c 2/m

Strunz Class:

VII/X.00-00 VII - Phosphates, Arsenates and Vanadates

VII/X - Unclassified Strunz Phosphates, Arsenates and Vanadates

VII/X.00 - Arsenate, Basic Hydrated

Other Guanacoite Information

See Also:

Links to other databases for Guanacoite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

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

Guanacoite

Cu2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2
Dana No: 42.4.1.2 Strunz No: VII/X.00-00
Locality:

Notes: