Kemmlitzite
A valid IMA mineral species
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About Kemmlitzite
Formula:
SrAl3(AsO4)(SO4)(OH)6
Colour:
Light grayish-brown, colorless, brownish (zonal)
Hardness:
5½
Specific Gravity:
3.63
Crystal System:
Trigonal
Member of:
Name:
Named for the type locality of Kemmlitz, Germany.
Type Locality:
Unique Identifiers
Mindat ID:
2182
Long-form identifier:
mindat:1:1:2182:7
IMA Classification of Kemmlitzite
Approved
IMA Formula:
SrAl3(As5+O4)(S6+O4)(OH)6
First published:
1969
Classification of Kemmlitzite
8.BL.05
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
43.4.1.7
43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
43 : COMPOUND PHOSPHATES, ETC.
4 : Anhydrous Compound Phosphates, etc·, Containing Hydroxyl or Halogen
22.3.10
22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
22 : Phosphates, Arsenates or Vanadates with other Anions
3 : Phosphates, arsenates or vanadates with sulphates
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 for Standard |
|---|---|---|
| Kml | 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 Kemmlitzite
Transparency:
Transparent, Translucent
Colour:
Light grayish-brown, colorless, brownish (zonal)
Hardness:
5½ on Mohs scale
Cleavage:
Poor/Indistinct
Poor on {0001}
Poor on {0001}
Density:
3.63 g/cm3 (Measured) 3.601 g/cm3 (Calculated)
Optical Data of Kemmlitzite
Type:
Uniaxial (+)
RI values:
nω = 1.701(1) nε = 1.707(1)
Max. Birefringence:
δ = 0.006
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
Relative to Canada balsam mounting medium (n ≈ 1.537).
This shows the grain boundary and Becke line effect under plane-polarised
light, based on the contrast between this mineral's average refractive
index and the mounting medium. It does not take into account mineral
colouration.
In focus
Interference Figure:
This shows the idealized uniaxial interference figure - the conoscopic
(convergent-light, Bertrand-lens-in) view, for a grain cut with the optic axis
centred and vertical. The coloured rings are isochromatics, computed with the
same physics as the Michel-Lévy bar above; the dark cross is the isogyre.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
For a genuinely uniaxial mineral viewed this way, that cross stays perfectly stationary if you rotate the stage - unlike a biaxial mineral, where it splits apart on rotation. That invariance is itself the standard diagnostic test for telling uniaxial and biaxial minerals apart at the microscope.
Chemistry of Kemmlitzite
Mindat Formula:
SrAl3(AsO4)(SO4)(OH)6
Element Weights:
Crystallography of Kemmlitzite
Crystal System:
Trigonal
Class (H-M):
3m(32/m) - Hexagonal Scalenohedral
Space Group:
R3m
Setting:
R3m
Cell Parameters:
a = 7.072(1) Å, c = 16.51(1) Å
Ratio:
a:c = 1 : 2.335
Unit Cell V:
715.09 ų (Calculated from Unit Cell)
Z:
3
Comment:
Space Group: by analogy to beudantite
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 5.71 Å | (70) |
| 3.514 Å | (90) |
| 2.959 Å | (100) |
| 2.751 Å | (50) |
| 2.203 Å | (80) |
| 1.903 Å | (90) |
| 1.757 Å | (80) |
| 1.635 Å | (50b) |
| 1.456 Å | (50) |
| 1.292 Å | (60) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47b : [Sulfates and sulfites] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Kemmlitzite
General Appearance of Type Material:
Pseudo-cubic rhombohedral crystals with average rhombohedron edge 0.1-0.15 mm.
Place of Conservation of Type Material:
National Museum, Prague, Czech Republic, 53508.
National School of Mines, Paris, France.
Harvard University, Cambridge, Massachusetts, USA, 109097.
National School of Mines, Paris, France.
Harvard University, Cambridge, Massachusetts, USA, 109097.
Geological Setting of Type Material:
Kaolinized quartz porphyry.
Associated Minerals at Type Locality:
Other Language Names for Kemmlitzite
Relationship of Kemmlitzite to other Species
Member of:
Other Members of Beudantite Group:
| Beudantite | PbFe3+3(AsO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
| Cloudite | BaFe3+3(PO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
| Corkite | PbFe3+3(PO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
| Gallobeudantite | PbGa3(AsO4)(SO4)(OH)6 | Trig. 3m : R3m |
| Hidalgoite | PbAl3(AsO4)(SO4)(OH)6 | Trig. 3m : R3m |
| Hinsdalite | PbAl3(PO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
| Oberwolfachite | SrFe3+3(AsO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
| Slottaite | SrFe3+3(PO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
| Svanbergite | SrAl3(PO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
| 'UM2011-07-POSO:AlBaH' | BaAl3(PO4)(SO4)(OH)6 | |
| 'Unnamed (Fe-analogue of Weilerite and Ba-analogue of Oberwolfachite)' | BaFe3(AsO4)(SO4)(OH)6 | |
| Weilerite | BaAl3(AsO4)(SO4)(OH)6 | Hex. |
| Woodhouseite | CaAl3(PO4)(SO4)(OH)6 | Trig. 3m(32/m) : R3m |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 8.BL. | Kiryuite | NaMnAl(PO4)F3 |
| 8.BL. | Metaheimite | PbCu2(AsO4)(OH)3 |
| 8.BL. | Graulichite-(La) | LaFe3+3(AsO4)2(OH)6 |
| 8.BL. | Cloudite | BaFe3+3(PO4)(SO4)(OH)6 |
| 8.BL. | Oberwolfachite | SrFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL. | Arsenobenauite | SrFe3+3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.05 | Gallobeudantite | PbGa3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Slottaite | SrFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Corkite | PbFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Hidalgoite | PbAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Hinsdalite | PbAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | 'UM2011-07-POSO:AlBaH' | BaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Beudantite | PbFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Weilerite | BaAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| 8.BL.10 | Segnitite | PbFe3+3AsO4(AsO3OH)(OH)6 |
| 8.BL.10 | Arsenogoyazite | SrAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Dussertite | BaFe3+3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Galloplumbogummite | Pb(Ga,Al,Ge)3(PO4)2(OH)6 |
| 8.BL.10 | Stibiosegnitite | Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6 |
| 8.BL.10 va | 'Viséite' | |
| 8.BL.10 | Arsenocrandallite | CaAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Benauite | SrFe3+3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Crandallite | CaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Springcreekite | BaV3+3(PO4)2(OH,H2O)6 |
| 8.BL.10 | Eylettersite | Th0.75Al3(PO4)2(OH)6 |
| 8.BL.10 | Kintoreite | PbFe3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Gorceixite | BaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Goyazite | SrAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.13 | Florencite-(Ce) | CeAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(La) | LaAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Nd) | NdAl3(PO4)2(OH)6 |
| 8.BL.13 | Zaïrite | BiFe3+3(PO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(La) | LaAl3(AsO4)2(OH)6 |
| 8.BL.13 | 'Arsenoflorencite-(Nd)' | NdAl3(AsO4)2(OH)6 |
| 8.BL.13 | 'Unnamed (As-analogue of Zaïrite)' | (Bi,Pb)Fe3+3(AsO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(Ce) | CeAl3(AsO4)2(OH)6 |
| 8.BL.13 | Graulichite-(Ce) | CeFe3+3(AsO4)2(OH)6 |
| 8.BL.13 | 'Arsenowaylandite' | BiAl3(AsO4)2(OH)6 |
| 8.BL.13 | Waylandite | BiAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Sm) | SmAl3(PO4)2(OH)6 |
| 8.BL.15 | Viitaniemiite | Na(Ca,Mn2+)Al(PO4)(F,OH)3 |
| 8.BL.25 | Pattersonite | PbFe3+3(PO4)2(OH)5 · H2O |
Other Information
Notes:
Resistant to mineral acids
Low magnetic susceptibility.
Low magnetic susceptibility.
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 Kemmlitzite
mindat.org URL:
https://www.mindat.org/min-2182.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
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References for Kemmlitzite
Reference List:
Scott, Keith M. (1987) Solid solution in, and classification of, gossan-derived members of the alunite-jarosite family, northwest Queensland, Australia. American Mineralogist, 72 (1-2) 178-187
Jambor, John L. (1999) Nomenclature of the alunite supergroup. The Canadian Mineralogist, 37 (6). 1323-1341
Schwab, R. G., Pimpl, T., Schukow, H., Stolle, A., Breitinger, D. K. (2005) Compounds of the crandallite-type: Synthesis, properties and thermodynamic data of Ca – Sr – Ba – Pb-(arseno)-woodhouseites. Neues Jahrbuch für Mineralogie - Abhandlungen, 181 (3) 207-218 doi:10.1127/0077-7757/2005/0018
Localities for Kemmlitzite
Showing 10 localities.
symbol to view information about a locality.
The 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).
All localities listed without proper references should be considered as questionable.
Czech Republic | |
| Moravec (200) +1 other reference |
| Novák et al. (1998) |
Germany | |
| Aufschluß 76/2 & 88/5 |
| Stefan Wolfsried and Łukasz Kruszewski collections (EDS-analysed by Günter Blass) |
| Hak et al. (1969) +1 other reference |
Greece | |
| SEM-EDS analysed by Chollet Pascal at ... +1 other reference |
Spain | |
| Calvo Rebollar et al. (2022) |
Switzerland | |
| Stalder et al. (1998) |
| Brugger et al. (1997) |
USA | |
| LaBerge et al. (1999) |
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Falotta, Tinizong, Surses, Albula Region, Grisons, Switzerland