Koechlinite
A valid IMA mineral species - grandfathered
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About Koechlinite
Formula:
Bi2MoO6
Colour:
Greenish yellow, white to light gray; greenish yellow in transmitted light
Lustre:
Silky
Specific Gravity:
8.26 (Calculated)
Crystal System:
Orthorhombic
Member of:
Name:
Named in 1914 by Waldemar Theodore Schaller in honor of Rudolf Ignatz Koechlin [November 11, 1862 Wien, Austria - February 11, 1939 Wien, Austria], Austrian mineralogist and Curator of the mineral collection of the Vienna Natural History Museum (former Hof-Museum), Vienna, Austria.
A rare secondary mineral occurring in the oxidation zones of Bi-Mo deposits.
The molybdate analogue of russellite.
The molybdate analogue of russellite.
Unique Identifiers
Mindat ID:
2235
Long-form identifier:
mindat:1:1:2235:0
GUID
(UUID V4):
(UUID V4):
ed2bb724-f600-4806-89bb-17b7f22d6358
IMA Classification of Koechlinite
Approved, 'Grandfathered' (first described prior to 1959)
First published:
1914
Classification of Koechlinite
4.DE.15
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
E : With medium-sized cations; with various polyhedra
48.2.2.1
48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
2 : A2XO4
48 : ANHYDROUS MOLYBDATES AND TUNGSTATES
2 : A2XO4
27.3.4
27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
27 : Sulphites, Chromates, Molybdates and Tungstates
3 : Molybdates
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
Symbol | Source | Reference |
---|---|---|
Kcl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Koechlinite
Silky
Transparency:
Transparent
Colour:
Greenish yellow, white to light gray; greenish yellow in transmitted light
Streak:
Pale greenish yellow
Tenacity:
Very brittle
Cleavage:
Perfect
On {010}, perfect on {0kl}, imperfect.
On {010}, perfect on {0kl}, imperfect.
Density:
8.26 g/cm3 (Calculated)
Optical Data of Koechlinite
Type:
Biaxial (-)
RI values:
nα = 2.520 nβ = 2.610 nγ = 2.670
Max Birefringence:
δ = 0.150
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
none
Pleochroism:
Weak
Comments:
In shades of greenish yellow.
Comments:
2V measured = large.
Chemistry of Koechlinite
Mindat Formula:
Bi2MoO6
Elements listed:
Crystallography of Koechlinite
Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Space Group:
Pna21
Cell Parameters:
a = 5.4822 Å, b = 16.1986 Å, c = 5.5091 Å
Ratio:
a:b:c = 0.338 : 1 : 0.34
Unit Cell V:
489.23 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Crystals thin, square to rectangular plates striated parallel [010] and laths flattened on {010}; spheroidal aggregates of laths; massive or earthy incrustations.
Twinning:
{101} as twin plane, penetration and contact twins. Composition face {101} or {010} in contact twins.
Comment:
Pseudotetragonal; Space Group based on synthetic material.
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Big Balls | Small Balls | Just Balls | Spacefill
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Big Balls | Small Balls | Just Balls | Spacefill
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0009999 | Koechlinite | Teller R G, Brazdil J F, Grasselli R K, Jorgensen J D (1984) The structure of gamma-bismuth molybdate, Bi2MoO6, by powder neutron diffraction Acta Crystallographica C40 2001-2005 | 1984 | synthetic | 0 | 293 |
CIF Raw Data - click here to close
Epitaxi Comments:
Parallel growths with an unidentified orthorhombic mineral reported.
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.131 Å | (100) |
1.647 Å | (90) |
1.918 Å | (80) |
1.628 Å | (70) |
2.733 Å | (60) |
1.936 Å | (60) |
1.570 Å | (60) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 7: Great Oxidation Event | <2.4 |
47h : [Near-surface oxidized, dehydrated minerals] |
Type Occurrence of Koechlinite
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts: #64801. U.S. National Museum of Natural History, Washington, D.C., USA: #R6411, 93646.
Reference:
Schaller, W.T. (1914) Mineralogical notes. Koechlinite (bismuth molybdate), a new mineral from Schneeberg. Journal of the Washington Academy of Sciences: 4: 354-356.
Other Language Names for Koechlinite
Relationship of Koechlinite to other Species
Member of:
Other Members of this group:
Russellite | Bi2WO6 | Orth. mm2 : Pca21 |
Tungstibite | Sb3+2WO6 | Orth. 2 2 2 |
Common Associates
Associated Minerals Based on Photo Data:
11 photos of Koechlinite associated with Bismuthinite | Bi2S3 |
8 photos of Koechlinite associated with Quartz | SiO2 |
5 photos of Koechlinite associated with Bismutite | (BiO)2CO3 |
2 photos of Koechlinite associated with Russellite | Bi2WO6 |
2 photos of Koechlinite associated with Wolframite Group | |
2 photos of Koechlinite associated with Muscovite | KAl2(AlSi3O10)(OH)2 |
2 photos of Koechlinite associated with Bismuth | Bi |
1 photo of Koechlinite associated with Zavaritskite | (BiO)F |
1 photo of Koechlinite associated with Fluorite | CaF2 |
1 photo of Koechlinite associated with Sardignaite | BiMo2O7(OH) · 2H2O |
Related Minerals - Strunz-mindat Grouping
4.DE. | Ziroite | ZrO2 |
4.DE. | Pertoldite | GeO2 |
4.DE. | Colchesterite | Bi3+2Mo6+2O9 |
4.DE.05 | Downeyite | SeO2 |
4.DE.10 | Koragoite | (Mn2+,Fe3+)3(Nb,Ta,Ti)2(Nb,Mn)2(W,Ta)2O20 |
4.DE.15 | Russellite | Bi2WO6 |
4.DE.15 | Tungstibite | Sb3+2WO6 |
4.DE.20 | Tellurite | TeO2 |
4.DE.25 | Paratellurite | TeO2 |
4.DE.30 | Bismutotantalite | Bi(Ta,Nb)O4 |
4.DE.30 | Bismutocolumbite | Bi(Nb,Ta)O4 |
4.DE.30 | Cervantite | Sb3+Sb5+O4 |
4.DE.30 | Stibiotantalite | Sb(Ta,Nb)O4 |
4.DE.30 | Stibiocolumbite | Sb(Nb,Ta)O4 |
4.DE.30 | Clinocervantite | Sb3+Sb5+O4 |
4.DE.35 | Baddeleyite | ZrO2 |
4.DE.40 | Billwiseite | Sb3+5Nb3WO18 |
4.DE.45 | Kyawthuite | Bi3+Sb5+O4 |
Other Information
Notes:
Readily soluble in HCl, less so in HNO3.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Koechlinite
mindat.org URL:
https://www.mindat.org/min-2235.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
References for Koechlinite
Reference List:
Frondel, Clifford (1943) New data on agricolite, bismoclite, koechlinite, and the bismuth arsenates. American Mineralogist, 28 (9-10) 536-540
Localities for Koechlinite
Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Australia | |
| Palache et al. (1951) |
| Rankin et al. (2002) |
| Sharpe et al. (2004) |
Clissold (2007) | |
| Petrella (2015) |
| R Bottrill |
| W.D.Birch 2001. A note on koechlinitr from Pittong (2) |
| Museum Victoria Mineralogy Collection |
| Palache et al. (1951) |
| Hodge (1970) |
China | |
| www.minsocam.org (2009) |
Czech Republic | |
| Sejkora et al. (2006) |
| Jiří Sejkora - Sekundární minerály ... |
| Samples was analysed by P. Pauliš. |
J.Sejkora | |
Germany | |
| Walenta (1992) +1 other reference |
| |
Journal of the Washington Academy of Science (1914) +2 other references | |
| Lapis 30 (7/8) |
| Witzke et al. (2007) |
| Witzke et al. (2007) |
Italy | |
| Gentile et al. (2023) |
| Gentile et al. (2023) |
| Orlandi et al. (2011) +1 other reference |
Orlandi et al. (2005) | |
| AA. VV. |
Japan | |
| 浜地忠男 (1961) +1 other reference |
| Sadanaga et al. (1974) |
Kazakhstan | |
| Jeremolenko (2002) |
| Pavel.M. Kartashov (n.d.) |
Mexico | |
| dan weinrich |
Poland | |
| Mochnacka et al. (2015) +1 other reference |
South Africa | |
| Rocks & Minerals 83:5 pp 410-421 +1 other reference |
| Cairncross et al. (1995) |
Spain | |
| Rewitzer et al. (2018) |
| Calvo (2009) |
UK | |
| M.Wirth collection |
USA | |
| Anthony et al. (1995) |
| Mineralogical Record (1998) |
Dunning et al. (2005) | |
| Eckel et al. (1997) |
| Cooper et al. (1991) |
| Wolff et al. (2014) |
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Punta de Su Seinargiu, Sarroch, Metropolitan City of Cagliari, Sardinia, Italy