[Content and History] [Recent Issues] [Back Issues] [Subscriptions] [Contacts] See Also: [Diamond Crystals] [Excalibur Minerals] [Hudson Institute] [Minerals on CDROM] Mineral News was founded some twenty years ago and has developed a following of avid mineral collectors seeking timely information about new finds and other items of interest to the collector community. Articles are solicited from collector and scientific authors. General Calcioandyrobertsite-2O InformationKCaCu5(AsO4)4[As(OH)2O2]•2(H2O) |
Molecular Weight = 1,129.55 gm |
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Potassium 3.46 % K 4.17 % K2O |
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Calcium 3.55 % Ca 4.96 % CaO |
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Copper 28.13 % Cu 31.67 % Cu2O |
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Arsenic 33.16 % As 50.87 % As2O5 |
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Hydrogen 0.54 % H 4.78 % H2O |
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Oxygen 31.16 % O |
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______ ______ |
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100.00 % 96.46 % = TOTAL OXIDE |
KCaCu5(AsO4)4(OH)2AsO2•2(H2O) |
Occurs in a specimen of quartz gangue. Polymorph of calcioandyrobertsite; structure. |
Approved IMA 2004 (Dana # Added) |
Tsumeb mine, Namibia Link to MinDat.org Location Data. |
Named as the -2O polytype of calcio-andyrobertsite-1M |
Calcioandyrobertsite-2O + Pronunciation | Calcio-andyrobertsite-2O - Renamed Calcioandyrobertsite-2O by Mineralogical Record, v39 (2008), p131 |
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IMA2000-011 |
| | Search for Calcioandyrobertsite-2O Images
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| | Calcioandyrobertsite-2O Crystallographya:b:c =1.9477:1:0.9877 |
a = 19.647, b = 10.087, c = 9.963, Z = 4; V = 1,974.46 Den(Calc)= 3.80 |
Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma |
By Intensity(I/Io): 3.116(1)(322,610), 2.76(0.9)(132), 4.487(0.9)(220),4.83(0.7)(102), 7.084(0.7)(011), 3.965(0.6)(302), 6.665(0.6)(111), 9.8(0.5)(200), 1.758(0.4)(840,11.0.1), |
| Physical Properties of Calcioandyrobertsite-2O{100} Good |
Intense blue. |
3.9 |
Transparent |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
Platy - Sheet forms (e.g. micas). |
3-4 - Calcite-Fluorite |
Vitreous (Glassy) |
pale blue |
| Optical Properties of Calcioandyrobertsite-2OCI meas= 0.026 (Excellent) - where the CI = (1-KPDmeas/KC) |
CI calc= 0.001 (Superior) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.1912,KPDmeas= 0.1863,KC= 0.1914 Ncalc = 1.73 - 1.75 Biaxial (-), a=1.715, b=1.73, g=1.735, bire=0.0200 |
| Calculated Properties of Calcioandyrobertsite-2OBulk Density (Electron Density)=3.57 gm/cc |
note: Specific Gravity of Calcioandyrobertsite-2O =3.80 gm/cc. Fermion Index = 0.000202433 |
Boson Index = 0.999797567 PECalcioandyrobertsite-2O = 36.27 barns/electron |
U=PECalcioandyrobertsite-2O x relectron= 129.57 barns/cc. |
GRapi = 46.97 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Calcioandyrobertsite-2O | Calcioandyrobertsite-2O Classification42.09.02.05 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.09)where (A)3 (XO4)2 Zq · x(H2O) |
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(42.09.02)Souzalite Group |
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08.DH.50 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DH -With large and medium-sized cations, (OH, etc.):RO4 < 1:1 |
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| Other Calcioandyrobertsite-2O InformationNAME( EurJMin, 16:163) PHYS. PROP.(EurJMin, 16:163) OPTIC PROP.(EurJMin, 16:163) |
Links to other databases for Calcioandyrobertsite-2O : |
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 10 - Ruff.Info Search for Calcioandyrobertsite-2O using: Visit our Advertisers for Calcioandyrobertsite-2O : AA Mineral SpecimensB & L Fine Minerals Crystalarium.com Dan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Diamond Dan Publications Excalibur Minerals Exceptional Minerals Fabre Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club Wrights Rock Shop Translate Calcioandyrobertsite-2O Mineral Data : Ask about Calcioandyrobertsite-2O here : Print or Cut-and-Paste your Calcioandyrobertsite-2O Specimen Label here :
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