Mineralogy Database

Guanacoite Mineral Data

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General Guanacoite Information

Help on Chemical  Formula: Chemical Formula: (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2
Help on Composition: Composition: Molecular Weight = 612.83 gm
   Magnesium  12.41 %  Mg   20.59 % MgO
   Copper     19.39 %  Cu   24.27 % CuO
   Arsenic    24.45 %  As   37.50 % As2O5
   Hydrogen    1.97 %  H    17.64 % H2O
   Oxygen     41.77 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: 2(Cu0.85)2(Mg0.15)Mg2Mg0.83Cu0.17(OH)4(AsO4)2(H2O)4
Help on Environment: Environment: Isotypic with akrochordite
Help on IMA Status: IMA Status: Approved IMA 2003 (Dana # Added)
Help on Locality: Locality: Mine dump at the El Guanaco Mine, East Catalina, Chile, South America Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Synonym: Synonym: IMA2003-021
 

Guanacoite Image

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  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

Help on Axial Ratios: Axial Ratios: a:b:c =0.3247:1:0.4115
Help on Cell Dimensions: Cell Dimensions: a = 5.459, b = 16.808, c = 6.917, Z = 2; beta = 100.44° V = 624.16 Den(Calc)= 3.26
Help on Crystal System: 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/Io): 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

Help on Color: Color: Blue, Pale blue.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: pale blue
 

Optical Properties of Guanacoite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2096,KC= 0.2032
Ncalc = 1.66
Help on Optical Data: Optical Data: Biaxial (-), a=1.664, b=1.691, g=1.695, bire=0.0310
 

Calculated Properties of Guanacoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.17 gm/cc
note: Specific Gravity of Guanacoite =3.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGuanacoite = 25.03 barns/electron
U=PEGuanacoite x rElectron Density= 79.31 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Guanacoite is Not Radioactive
 

Guanacoite Classification

Help on  Dana Class: Dana Class: 42.04.01.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.04)where (AB)5 (XO4)2 Zq � x(H2O)
  (42.04.01)Akrochordite Group
 
42.04.01.01 Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m
 
42.04.01.02 Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m
Help on  Strunz Class: Strunz Class: 08.DD.10 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1
 
08.DD.10 Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m
 
08.DD.10 Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m
 

Other Guanacoite Information

Help on References: References: NAME( AmMin, v93:501) PHYS. PROP.(AmMin, v93:501) OPTIC PROP.(AmMin, v93:501)
Help on See Also: See Also: Links to other databases for Guanacoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

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

Guanacoite

(Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2
Dana No: 42.04.01.02 Strunz No: 08.DD.10
Locality:

 

Notes:

 

 
   
 


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