Douglasite Mineral Data

Douglasite Mineral Data +

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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.

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:

MonoclinicSpace 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

Gladstone-Dale:

CI meas= 0.2 (Poor) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.2285,KC= 0.2855

Optical Data:

Uniaxial (+), w=1.488, e=1.5, bire=0.0120.

Calculated Properties of Douglasite

Electron Density:

r_electron=2.11 gm/cc
note: r_Douglasite=2.16 gm/cc.

Fermion Index

Fermion Index = 0.00387
Boson Index = 0.99613

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)

Estimated Radioactivity from Douglasite - barely detectable

Douglasite Classification

Dana Class:

11.3.1.1 (11)Halide Complexes; Alumino-fluorides

(11.3)where (A)m B (X)4 · x(H2O)

(11.3.1)Dana Group

11.3.1.1 Douglasite K2FeCl4·2(H2O) Unk. Mono

Strunz Class:

III/C.07-20 III - Halogenides

III/C - Double halogenides with water, Chlorides

III/C.07 - Rinneite - Kremersite series

III/C.07-10 Mitscherlichite K2CuCl4·2(H2O) P 4₁/mnm 4/m 2/m 2/m

III/C.07-20 Douglasite K2FeCl4·2(H2O) Unk. Mono

III/C.07-30 Erythrosiderite K2FeCl5·(H2O) P nma 2/m 2/m 2/m

III/C.07-40 Kremersite (NH4,K)2FeCl5·(H2O) Pmnb 2/m 2/m 2/m

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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Print or Cut-and-Paste your Douglasite Specimen Label here :

Douglasite

K2Fe++Cl4·2(H2O)
Dana No: 11.3.1.1 Strunz No: III/C.07-20
Locality:

Notes: