[Newest Minerals] [Rare Minerals] [Cabinet Specimens] [About Us] [Image Gallery] Dakota Matrix Minerals Updated weekly, for the collector, educator, and researcher since 1996 Extensive Inventory of very Rare Minerals. Visa and Mastercard are Welcome General Douglasite InformationK2Fe++Cl4•2(H2O) |
Molecular Weight = 311.88 gm |
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Potassium 25.07 % K 30.20 % K2O |
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Iron 17.91 % Fe 23.04 % FeO |
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Hydrogen 1.29 % H 11.55 % H2O |
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Chlorine 45.47 % Cl 45.47 % Cl |
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- %
Cl -10.26 % -O=Cl2 |
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Oxygen 10.26 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
K2Fe2+Cl4•2(H2O) |
Altered marine evaporite rocks. |
Valid Species (Pre-IMA) 1879 |
Found at Douglasschall, northwest of Stassfurt, Germany. Link to MinDat.org Location Data. |
Named after its discovery locality. |
Douglasite + Pronunciation |
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Douglasite Crystallography MonoclinicSpace Group: Unk. |
By Intensity(I/Io): 3.08(1), 3.67(0.8), 4.03(0.6),4.16(0.6), 2.97(0.5), 5.07(0.5), 1.822(0.4), 2.37(0.4), |
| Physical Properties of Douglasite{???} Indistinct |
Brown red, Light green. |
2.162 |
Massive - Granular - Common texture observed in granite and other igneous rock. |
Vitreous (Glassy) |
| Optical Properties of DouglasiteUniaxial (+), w=1.488, e=1.5, bire=0.0120. |
| Calculated Properties of DouglasiteBulk Density (Electron Density)=2.11 gm/cc |
note: Specific Gravity of Douglasite =2.16 gm/cc. Fermion Index = 0.0038774046 |
Boson Index = 0.9961225954 PEDouglasite = 10.87 barns/electron |
U=PEDouglasite x relectron= 22.91 barns/cc. |
GRapi = 352.62 (Gamma Ray American Petroleum Institute Units)
Estimated Radioactivity from Douglasite | Douglasite Classification11.03.01.01 (11)Halide Complexes; Alumino-fluorides |
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(11.03)where (A)m B (X)4 · x(H2O) |
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(11.03.01)Dana Group |
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03.CJ.20 03 - HALIDES |
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03.C - Complex Halides |
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03.CJ -With MX6 complexes; M = Fe, Mn, Cu |
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| Other Douglasite InformationNAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
Links to other databases for Douglasite : |
1 - Am. Min. Crystal Structure Database 2 - Athena 3 - EUROmin Project 4 - Ecole des Mines de Paris 5 - GeoScienceWorld 6 - Google Images 7 - Google Scholar 8 - Handbook of Mineralogy (MinSocAm) 9 - Handbook of Mineralogy (UofA) 10 - MinDAT 11 - Mineralienatlas (Deutsch) 12 - Online Mineral Museum 13 - QUT Mineral Atlas 14 - Ruff.Info Search for Douglasite using: Visit our Advertisers for Douglasite : B & L Fine MineralsDan Weinrich Fine Minerals Dan Weinrich Auctions Dakota Matrix Excalibur Minerals Exceptional Minerals Fabre Minerals John Betts Fine Minerals Lapis Mineral Journal Mineral News UV Tools Wrights Rock Shop Translate Douglasite Mineral Data : Ask about Douglasite here : Print or Cut-and-Paste your Douglasite Specimen Label here :
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