Koechlinite Mineral Data

Koechlinite Mineral Data +

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General Koechlinite Information

Chemical Formula:

Bi2MoO6

Composition:

Molecular Weight = 609.90 gm

Bismuth 68.53 % Bi 76.40 % Bi₂O₃

Molybdenum 15.73 % Mo 23.60 % MoO₃

Oxygen 15.74 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Bi₂MoO₆

Environment:

In cavities in vein material composed of quartz, bismuth, and smaltite.

IMA Status:

Valid Species (Pre-IMA) 1914

Locality:

Daniel mine, Schneeberg, Sazony, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for Rudolf Koechlin (1862-1939), Austrian mineralogist.

Synonym:

ICSD 17070

PDF 21-102

Koechlinite Image

Images:

Koechlinite

Comments: Greenish yellow crystal of koechlinite on quartz.
Location: Adam Heber Mine, Neust?dtel, Schneeberg district, Erzgebirge, Saxony, Germany. Scale: Picture size 1 mm.
© Thomas Witzke / Abraxas-Verlag

Koechlinite Crystallography

Axial Ratios:

a:b:c =0.3393:1:0.3381

Cell Dimensions:

a = 5.502, b = 16.213, c = 5.483, Z = 4; V = 489.11 Den(Calc)= 8.28

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: C mca

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

By Intensity(I/I_o): 3.15(1), 1.652(0.2), 2.741(0.18),

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Physical Properties of Koechlinite

Cleavage:

[010] Perfect

Color:

Greenish yellow, Yellow, White.

Density:

8.26

Diaphaniety:

Transparent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Luster:

Vitreous (Glassy)

Streak:

yellow white

Optical Properties of Koechlinite

Gladstone-Dale:

CI meas= -0.121 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.118 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1932,KPDmeas= 0.1937,KC= 0.1728

Optical Data:

Biaxial (-), a=2.52, b=2.61, g=2.67, bire=0.1500, 2V(Calc)=76, 2V(Meas)=large. Dispersion r < v strong.

Calculated Properties of Koechlinite

Electron Density:

r_electron=6.95 gm/cc
note: r_Koechlinite=8.28 gm/cc.

Fermion Index

Fermion Index = 0.04014
Boson Index = 0.95986

Photoelectric:

PE_Koechlinite=1,342.38 barns/electron
U=PE_Koechlinite x r_electron=9,330.81 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Koechlinite is Not Radioactive

Koechlinite Classification

Dana Class:

48.2.2.1 (48)Anhydrous Molybdates and Tungstates

(48.2)where (A)2 XO4

(48.2.2)Dana Group

48.2.2.1 Koechlinite Bi2MoO6 C mca 2/m 2/m 2/m

Strunz Class:

VI/G.01-60 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/G - Molybdates [MoO4]2- and wolframates [WO4]2-

VI/G.01 - Scheelite - Wulfenite series, (Powellite - Raspite)

VI/G.01-10 Powellite CaMoO4 I 4₁/a 4/m

VI/G.01-20 Scheelite CaWO4 I 4₁/a 4/m

VI/G.01-25 Paraniite-(Y) Ca2Y(AsO4)(WO4)2 I 4₁/a 4/m

VI/G.01-30 Wulfenite PbMoO4 I 4₁/a 4/m

VI/G.01-40 Stolzite PbWO4 I 4₁/a 4/m

VI/G.01-50 Raspite PbWO4 P 2/n 2/m

VI/G.01-60 Koechlinite Bi2MoO6 C mca 2/m 2/m 2/m

VI/G.01-70 Russellite Bi2WO6 P ca2₁ mm2

Other Koechlinite Information

References:

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

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Koechlinite

Bi2MoO6
Dana No: 48.2.2.1 Strunz No: VI/G.01-60
Locality:

Notes: