Douglasite Mineral Data

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

- % Cl -10.26 % -O=Cl₂

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

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

Crystal System:

Monoclinic Space Group: Unk.

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Douglasite= 10.87 barns/electron
U=PE_Douglasite x r_electron= 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 ï¿½ 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: