Douglasite Mineral Data

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.

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

Search for Douglasite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Douglasite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Douglasite Mineral Data :

Ask about Douglasite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: