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Douglasite Mineral Data
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General Douglasite Information
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Chemical Formula: |
K2Fe++Cl4•2(H2O) |
Composition: |
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 |
Empirical Formula: |
K2Fe2+Cl4•2(H2O) |
Environment: |
Altered marine evaporite rocks. |
IMA Status: |
Valid Species (Pre-IMA) 1879 |
Locality: |
Found at Douglasschall, northwest of Stassfurt, Germany. Link to MinDat.org Location Data. |
Name Origin: |
Named after its discovery locality. |
Name Pronunciation: |
Douglasite + Pronunciation |
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Douglasite Image |
Images:
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Douglasite Crystallography
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Crystal System: |
Monoclinic Space Group: Unk. |
X Ray Diffraction: |
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), |
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Physical Properties of Douglasite
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Cleavage: |
{???} Indistinct |
Color: |
Brown red, Light green. |
Density: |
2.162 |
Habit: |
Massive - Granular - Common texture observed in granite and other igneous rock. |
Luster: |
Vitreous (Glassy) |
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Optical Properties of Douglasite
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Optical Data: |
Uniaxial (+), w=1.488, e=1.5, bire=0.0120. |
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Calculated Properties of Douglasite
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Electron Density: |
Bulk Density (Electron Density)=2.11 gm/cc note: Specific Gravity of Douglasite =2.16 gm/cc. |
Fermion Index: |
Fermion Index = 0.0038774046 Boson Index = 0.9961225954 |
Photoelectric: |
PEDouglasite = 10.87 barns/electron U=PEDouglasite x relectron= 22.91 barns/cc. |
Radioactivity: |
GRapi = 352.62 (Gamma Ray American Petroleum Institute Units)
Concentration of Douglasite per GRapi unit = 0.28 (%)
Estimated Radioactivity from Douglasite - barely detectable
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Douglasite Classification
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Dana Class: |
11.03.01.01 (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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11.03.01.01 Douglasite K2FeCl4•2(H2O) Unk. Mono |
Strunz Class: |
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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03.CJ.20 Douglasite K2FeCl4•2(H2O) Unk. Mono |
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Other Douglasite Information
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References: |
NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8) |
See Also: |
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
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Print or Cut-and-Paste your Douglasite Specimen Label here :
Douglasite
K2Fe++Cl4•2(H2O)
Dana No: 11.03.01.01 Strunz No: 03.CJ.20
Locality:
Notes:
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