Mineralogy Database

Douglasite Mineral Data

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General Douglasite Information

Help on Chemical  Formula: Chemical Formula: K2Fe++Cl4•2(H2O)
Help on Composition: 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
                -   %   Cl  -10.26 % -O=Cl2   
   Oxygen     10.26 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K2Fe2+Cl4•2(H2O)
Help on Environment: Environment: Altered marine evaporite rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1879
Help on Locality: Locality: Found at Douglasschall, northwest of Stassfurt, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its discovery locality.
Help on Name Pronunciation: Name Pronunciation: Douglasite + Pronunciation Say DOUGLASITE

Douglasite Image

Click Here for Larger   Image in a New Browser Window Images:
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Comments: Small red-brown translucent grain of douglasite with white halite.
Location: Koningshutte, Silesia, Poland. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Douglasite Crystallography

Help on Crystal System: Crystal System: Monoclinic Space Group: Unk.
Help on X Ray Diffraction: 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

Help on Cleavage: Cleavage: {???} Indistinct
Help on Color: Color: Brown red, Light green.
Help on Density: Density: 2.162
Help on Habit: Habit: Massive - Granular - Common texture observed in granite and other igneous rock.
Help on Luster: Luster: Vitreous (Glassy)

Optical Properties of Douglasite

Help on Optical Data: Optical Data: Uniaxial (+), w=1.488, e=1.5, bire=0.0120.

Calculated Properties of Douglasite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.11 gm/cc
note: Specific Gravity of Douglasite =2.16 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0038774046
Boson Index = 0.9961225954
Help on Photoelectric: Photoelectric: PEDouglasite = 10.87 barns/electron
U=PEDouglasite x relectron= 22.91 barns/cc.
Help on Radioactivity: 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

Help on  Dana Class: Dana Class: (11)Halide Complexes; Alumino-fluorides
  (11.03)where (A)m B (X)4 � x(H2O)
  (11.03.01)Dana Group Douglasite K2FeCl4•2(H2O) Unk. Mono
Help on  Strunz Class: 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

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: 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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Dana No: Strunz No: 03.CJ.20