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Guanacoite Mineral Data |
General Guanacoite Information |
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(Cu,Mg)2Mg2(Mg,Cu)(OH)4(H2O)4(AsO4)2 | ||
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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 | |||
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2(Cu0.85)2(Mg0.15)Mg2Mg0.83Cu0.17(OH)4(AsO4)2(H2O)4 | ||
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Isotypic with akrochordite | ||
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Approved IMA 2003 (Dana # Added) | ||
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Mine dump at the El Guanaco Mine, East Catalina, Chile, South America Link to MinDat.org Location Data. | ||
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Named for the locality. | ||
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IMA2003-021 | ||
Guanacoite Image | |||
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Guanacoite Crystallography |
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a:b:c =0.3247:1:0.4115 | ||
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a = 5.459, b = 16.808, c = 6.917, Z = 2; beta = 100.44° V = 624.16 Den(Calc)= 3.26 | ||
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Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/c | ||
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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 |
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Blue, Pale blue. | ||
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Transparent | ||
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Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | ||
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Vitreous (Glassy) | ||
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pale blue | ||
Optical Properties of Guanacoite |
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CI calc= -0.032 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2096,KC= 0.2032 Ncalc = 1.66 |
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Biaxial (-), a=1.664, b=1.691, g=1.695, bire=0.0310 | ||
Calculated Properties of Guanacoite |
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Bulk Density (Electron Density)=3.17 gm/cc note: Specific Gravity of Guanacoite =3.26 gm/cc. |
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Fermion Index = 0.01 Boson Index = 0.99 |
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PEGuanacoite = 25.03 barns/electron U=PEGuanacoite x rElectron Density= 79.31 barns/cc. |
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GRapi = 0 (Gamma Ray American Petroleum Institute Units) Guanacoite is Not Radioactive |
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Guanacoite Classification |
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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 | |||
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08.DD.10 08 - PHOSPHATES, ARSENATES, VANADATES | ||
08.D - Phosphates, etc | |||
08.DD -With only medium-sized cations, (OH, etc.):RO4 = 2:1 | |||
Other Guanacoite Information |
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NAME( AmMin, v93:501) PHYS. PROP.(AmMin, v93:501) OPTIC PROP.(AmMin, v93:501) | ||
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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 Search for Guanacoite using: Visit our Advertisers for Guanacoite : Ask about Guanacoite here : Print or Cut-and-Paste your Guanacoite Specimen Label here :
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