Koenenite Mineral Data

General Koenenite Information

Chemical Formula:

Na4Mg4Cl12•Mg5Al4(OH)22

Composition:

Molecular Weight = 1,218.22 gm

Sodium 7.55 % Na 10.18 % Na₂O

Magnesium 17.96 % Mg 29.78 % MgO

Aluminum 8.86 % Al 16.74 % Al₂O₃

Hydrogen 1.82 % H 16.27 % H₂O

Chlorine 34.92 % Cl 34.92 % Cl

- % Cl -7.88 % -O=Cl₂

Oxygen 28.89 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₄Mg₉Cl₁₂Al₄(OH)₂₂

Environment:

Potash mine.

IMA Status:

Valid Species (Pre-IMA) 1902

Locality:

Justus I near Volpriehausen, and elsewhere in Hannover, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Adolf von Koenen (1837-1915), German geologist of Gottingen, who first found the mineral.

Name Pronunciation:

Koenenite + Pronunciation

Synonym:

ICSD 22305/6

PDF 43-684

Koenenite Image

Images:

Koenenite

Comments: Koenenite with cleavage planes.
Location: Bergmannssegen-Hugo Mine, Lehrte, near Hanover, Lower Saxony, Germany. Scale: Picture size 4 mm.
© Thomas Witzke / Abraxas-Verlag

Koenenite Crystallography

Axial Ratios:

a:c = 1:0.94009

Cell Dimensions:

a = 34.72, c = 32.64, Z = 33; V = 34,075.35 Den(Calc)= 1.96

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 3.5(1), 2.34(0.5), 2.85(0.5),

Crystal Structure:

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Allmann R , Lohse H N , Hellner E , Zeitschrift fur Kristallographie , 126 (1968) p.7-22, Die kristallstruktur des koenenits, eine doppelschichtstruktur mit zwei, inkommensurablen teilgittern, Note: one of two substructures in koenenite

Physical Properties of Koenenite

Cleavage:

{0001} Perfect

Color:

Colorless, Light yellow, Dark red.

Density:

1.98

Diaphaneity:

Transparent to Translucent

Fracture:

Flexible - Flexible fragments.

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Hardness:

1.5 - Between Talc and Gypsum

Luster:

Pearly

Streak:

white

Optical Properties of Koenenite

Optical Data:

Uniaxial (+), w=1.52, e=1.55, bire=0.0300.

Calculated Properties of Koenenite

Electron Density:

Bulk Density (Electron Density)=1.95 gm/cc
note: Specific Gravity of Koenenite =1.96 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Koenenite= 3.06 barns/electron
U=PE_Koenenite x rElectron Density= 5.96 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Koenenite is Not Radioactive

Koenenite Classification

Dana Class:

10.06.02.01 (10)Oxyhalides and Hydroxyhalides

(10.06)where Am Bn (O,OH)p Xq

(10.06.02)Dana Group

10.06.02.01 Koenenite Na4Mg4Cl12•Mg5Al4(OH)22 R 3m 3 2/m

Strunz Class:

03.BD.25 03 - HALIDES

03.B - Simple Halides, with H2O

03.BD -Simple Halides with H2O and additional OH

03.BD.25 Koenenite Na4Mg4Cl12•Mg5Al4(OH)22 R 3m 3 2/m

Other Koenenite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Koenenite :
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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Ask about Koenenite here :
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Print or Cut-and-Paste your Koenenite Specimen Label here :

Koenenite

Na4Mg4Cl12•Mg5Al4(OH)22
Dana No: 10.06.02.01 Strunz No: 03.BD.25
Locality:

Notes: