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Atacamite Mineral Data + |
General Atacamite Information |
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| Cu2Cl(OH)3 | |||
| Molecular Weight = 213.57 gm | |||
| Copper 59.51 % Cu 74.49 % CuO | |||
| Hydrogen 1.42 % H 12.65 % H2O | |||
| Chlorine 16.60 % Cl 16.60 % Cl | |||
| - % Cl -3.75 % -O=Cl2 | |||
| Oxygen 22.47 % O | |||
| ______ ______ | |||
| 100.00 % 100.00 % = TOTAL OXIDE | |||
| Cu2Cl(OH)3 | |||
| Arid climates with oxidizable copper minerals. | |||
| Valid Species (Pre-IMA) 1801 | |||
| Atacam desert province in northern Chile. Link to MinDat.org Location Data. | |||
| Named after its locality. | |||
| ICSD 61252 | |||
| PDF 25-269 | |||
| Paratacamite | |||
Atacamite Image | |||
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Atacamite Crystallography |
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| a:b:c =0.7491:1:0.6582 | |||
| a = 6.84, b = 9.13, c = 6.01, Z = 4; V = 375.32 Den(Calc)= 3.78 | |||
| Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: Pmcn | |||
| By Intensity(I/Io): 2.82(1), 5(1), 5.4(1), | |||
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Physical Properties of Atacamite |
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| [010] Perfect | |||
| Green, Yellow, Yellow green, Black green. | |||
| 3.76 - 3.78, Average = 3.76 | |||
| Transparent to translucent | |||
| Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). | |||
| Euhedral Crystals - Occurs as well-formed crystals showing good external form. | |||
| Fibrous - Crystals made up of fibers. | |||
| Granular - Generally occurs as anhedral to subhedral crystals in matrix. | |||
| 3-3.5 - Calcite-Copper Penny | |||
| None. | |||
| Adamantine | |||
| apple green | |||
Optical Properties of Atacamite |
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| CI meas= -0.024 (Excellent) - where the CI = (1-KPDmeas/KC) CI calc= -0.021 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2268,KPDmeas= 0.2274,KC= 0.2221 |
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| Biaxial (-), a=1.831, b=1.861, g=1.88, bire=0.0490, 2V(Calc)=74, 2V(Meas)=75. Dispersion strong, r < v. | |||
Calculated Properties of Atacamite |
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relectron=3.61 gm/cc |
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| Fermion Index = 0.00011 Boson Index = 0.99989 |
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PEAtacamite = 27.37 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Atacamite is Not Radioactive |
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Atacamite Classification |
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| 10.1.1.1 (10)Oxyhalides and Hydroxyhalides | |||
| (10.1)where (A)2 (O,OH)3 Xq | |||
| (10.1.1)Dana Group | |||
| III/D.01-30 III - Halogenides | |||
| III/D - Oxi-halogenides with Mg - Mn - Cu - Zn - Sn | |||
| III/D.01 - Atacamite series, Korshunovskite - Anthonyite | |||
Other Atacamite Information |
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| NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| Links to other databases for Atacamite : 1 - Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Athena 4 - EUROmin Project 5 - Ecole des Mines de Paris 6 - Franklin Minerals(Dunn) 7 - Glendale Community College 8 - Google Images 9 - Google Scholar 10 - Handbook of Mineralogy (MinSocAm) 11 - Handbook of Mineralogy (UofA) 12 - MinDAT 13 - MinMax(Deutsch) 14 - MinMax(English) 15 - Mineralienatlas (Deutsch) 16 - Philatelic Mineralogy 17 - QUT Mineral Atlas 18 - Ruff.Info 19 - WWW-MINCRYST 20 - YupRocks 21 - theimage Search for Atacamite using: Visit our Advertisers for Atacamite : AA Mineral SpecimensB & L Fine Minerals Dan Weinrich Fine Minerals Dan Weinrich Auctions Excalibur Minerals Exceptional Minerals Fabre Minerals Greenside Minerals Heliodor John Betts Fine Minerals Mason's Minerals Mineral News Mineral of the Month Club MineralsWeb Fine Minerals The GeoZone Wrights Rock Shop Translate Atacamite Mineral Data : Ask about Atacamite here : Print or Cut-and-Paste your Atacamite Specimen Label here :
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