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Guanacoite Mineral Data
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General Guanacoite Information
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Chemical Formula: |
(Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 |
Composition: |
Molecular Weight = 612.83 gm |
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Magnesium 12.41 % Mg 20.59 % MgO |
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Copper 19.39 % Cu 24.27 % CuO |
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Arsenic 24.45 % As 37.50 % As2O5 |
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Hydrogen 1.97 % H 17.64 % H2O |
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Oxygen 41.77 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
Empirical Formula: |
2(Cu0.85)2(Mg0.15)Mg2Mg0.83Cu0.17(OH)4(AsO4)2(H2O)4 |
Environment: |
Isotypic with akrochordite |
IMA Status: |
Approved IMA 2003 (Dana # Added) |
Locality: |
Mine dump at the El Guanaco Mine, East Catalina, Chile, South America Link to MinDat.org Location Data. |
Name Origin: |
Named for the locality. |
Synonym: |
IMA2003-021 |
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Guanacoite Image |
Images:
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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 |
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Guanacoite Crystallography
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Axial Ratios: |
a:b:c =0.3247:1:0.4115 |
Cell Dimensions: |
a = 5.459, b = 16.808, c = 6.917, Z = 2; beta = 100.44° V = 624.16 Den(Calc)= 3.26 |
Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c |
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), |
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Physical Properties of Guanacoite
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Color: |
Blue, Pale blue. |
Diaphaneity: |
Transparent |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Luster: |
Vitreous (Glassy) |
Streak: |
pale blue |
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Optical Properties of Guanacoite
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Gladstone-Dale: |
CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2096,KC= 0.2032 Ncalc = 1.66 |
Optical Data: |
Biaxial (-), a=1.664, b=1.691, g=1.695, bire=0.0310 |
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Calculated Properties of Guanacoite
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Electron Density: |
Bulk Density (Electron Density)=3.17 gm/cc note: Specific Gravity of Guanacoite =3.26 gm/cc. |
Fermion Index: |
Fermion Index = 0.01 Boson Index = 0.99 |
Photoelectric: |
PEGuanacoite = 25.03 barns/electron U=PEGuanacoite x rElectron Density= 79.31 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Guanacoite is Not Radioactive |
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Guanacoite Classification
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Dana Class: |
42.04.01.02 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.04)where (AB)5 (XO4)2 Zq � x(H2O) |
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(42.04.01)Akrochordite Group |
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42.04.01.01 Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m |
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42.04.01.02 Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m |
Strunz Class: |
08.DD.10 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1 |
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08.DD.10 Akrochordite Mn4Mg(AsO4)2(OH)4•4(H2O) P 21/c 2/m |
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08.DD.10 Guanacoite! (Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 P 21/c 2/m |
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Other Guanacoite Information
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References: |
NAME( AmMin, v93:501) PHYS. PROP.(AmMin, v93:501) OPTIC PROP.(AmMin, v93:501) |
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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