Douglasite Mineral Data (original) (raw)
General Douglasite Information
Chemical Formula:
K2Fe++Cl4•2(H2O)
Composition:
Molecular Weight = 311.88 gm
Potassium 25.07 % K 30.20 % K2O
Iron 17.91 % Fe 23.04 % FeO
Hydrogen 1.29 % H 11.55 % H2O
Chlorine 45.47 % Cl 45.47 % Cl
Oxygen 10.26 % O
______ ______
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 
Douglasite Image
Images:
Douglasite Crystallography
Crystal System:
MonoclinicSpace 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),
Physical Properties of Douglasite
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)
Optical Properties of Douglasite
Optical Data:
Uniaxial (+), w=1.488, e=1.5, bire=0.0120.
Calculated Properties of Douglasite
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
Douglasite Classification
Dana Class:
11.03.01.01 (11)Halide Complexes; Alumino-fluorides
(11.03)where (A)m B (X)4 � x(H2O)
(11.03.01)Dana Group
11.03.01.01 Douglasite K2FeCl4•2(H2O) Unk. Mono
Strunz Class:
03.CJ.20 03 - HALIDES
03.C - Complex Halides
03.CJ -With MX6 complexes; M = Fe, Mn, Cu
03.CJ.20 Douglasite K2FeCl4•2(H2O) Unk. Mono
Other Douglasite Information
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: