Kottenheimite
A valid IMA mineral species
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About Kottenheimite
Formula:
Ca 3Si(SO4)2(OH)6 · 12H2O
Colour:
Colorless, white
Lustre:
Vitreous, Silky
Hardness:
2 - 2½
Specific Gravity:
1.92
Crystal System:
Hexagonal
Member of:
Name:
Named for the community Kottenheim, located near Mayen and the Bellerberg volcano, Germany.
Unique Identifiers
Mindat ID:
42534
Long-form identifier:
mindat:1:1:42534:8
GUID
(UUID V4):
(UUID V4):
6960675e-4b0d-4145-9e73-5d4f20591fef
IMA Classification of Kottenheimite
Approved
IMA Formula:
Ca3Si(SO4)2(OH)6 · 12H2O
Approval year:
2011
First published:
2012
Classification of Kottenheimite
7.DG.15
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
D : Sulfates (selenates, etc.) with additional anions, with H2O
G : With large and medium-sized cations; with NO3, CO3, B(OH)4, SiO4 or IO3
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 |
---|---|---|
Khm | 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 Kottenheimite
Vitreous, Silky
Transparency:
Transparent
Comment:
vitreous in separate crystals and silky in aggregates
Colour:
Colorless, white
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
1.92(2) g/cm3 (Measured) 1.93 g/cm3 (Calculated)
Optical Data of Kottenheimite
Type:
Uniaxial (-)
RI values:
nω = 1.490(2) nε = 1.477(2)
Max Birefringence:
δ = 0.013
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:
Moderate
Chemistry of Kottenheimite
Mindat Formula:
Ca 3Si(SO4)2(OH)6 · 12H2O
Crystallography of Kottenheimite
Crystal System:
Hexagonal
Class (H-M):
6/m - Dipyramidal
Space Group:
P63/m
Cell Parameters:
a = 11.1548(3) Å, c = 10.5702(3) Å
Ratio:
a:c = 1 : 0.948
Unit Cell V:
1139.04 ų
Z:
2
Crystal Structure
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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) |
---|---|---|---|---|---|---|---|
0019043 | Kottenheimite | Chukanov N V, Britvin S N, Van K V, Mockel S, Zadov A E (2012) Kottenheimite, Ca3Si(OH)6(SO4)2*12H2O, a new member of the ettringite group from the Eifel area, Germany Rhineland-Palatinate, Germany The Canadian Mineralogist 50 55-63 | 2012 | Bellerberg, near Kottenheim, Eastern Eifel area, | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.72 Å | (100) |
5.590 Å | (69) |
4.645 Å | (26) |
3.840 Å | (54) |
3.455 Å | (21) |
2.751 Å | (34) |
2.536 Å | (27) |
2.185 Å | (30) |
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] | |
47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Kottenheimite
General Appearance of Type Material:
Snow-white radiating and random aggregates of hair-like subparallel clusters to 0.2 mm.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4102/1.
Geological Setting of Type Material:
Late hydrothermal assemblage related to alkali olivine basalt.
Reference:
Chukanov, N.V., Britvin S.N., Van, K.V., Möckel, S., Zadov, A.E. (2012) Kottenheimite, Ca3Si(OH)6(SO4)2·12H2O, a new member of the ettringite group from the Eifel area, Germany. The Canadian Mineralogist: 50: 55-63.
Synonyms of Kottenheimite
Relationship of Kottenheimite to other Species
Member of:
Other Members of this group:
Bentorite | Ca6Cr2(SO4)3(OH)12 · 26H2O | Trig. 3m : P3 1c |
Buryatite | Ca3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2O | Trig. 3m : P3 1c |
Carraraite | Ca3(SO4)[Ge(OH)6](CO3) · 12H2O | Hex. |
Charlesite | Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O | Trig. 3m : P3 1c |
Chiyokoite | Ca3Si(CO3)[B(OH)4]O (OH)5 · 12H2O | Hex. 6 : P63 |
Ettringite | Ca6Al2(SO4)3(OH)12 · 26H2O | Trig. 3m : P3 1c |
Hielscherite | Ca3Si(SO4)(SO3)(OH)6 · 11H2O | Hex. 6 : P63 |
Imayoshiite | Ca3Al(CO3)[B(OH)4](OH)6 · 12H2O | Hex. 6 : P63 |
Jouravskite | Ca3Mn4+(SO4)(CO3)(OH)6 · 12H2O | Hex. 6 : P63 |
Micheelsenite | (Ca2Y)Al(PO3OH)(CO3)(OH)6 · 12H2O | Hex. 6 : P63 |
Siwaqaite | Ca6Al2(CrO4)3(OH)12 · 26H2O | Trig. 3m : P3 1c |
Sturmanite | Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2O | Trig. 3m : P3 1c |
Tatarinovite | Ca3Al(SO4)[B(OH)4](OH)6 · 12H2O | Hex. 6 : P63 |
Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O | Hex. 6 : P63 |
UM2008-07-CO:AlBCaHSSi | Ca6(Al,Si)2(CO3,SO4)2[B(OH)4](OH,O)12 · 26H2O | |
Unnamed (possible Mn(IV) analogue of Sturmanite) | Ca6Mn4+2(SO4)2[B(OH)4](OH)10O2 · nH2O |
Common Associates
Associated Minerals Based on Photo Data:
1 photo of Kottenheimite associated with Åkermanite | Ca2Mg[Si2O7] |
Related Minerals - Strunz-mindat Grouping
7.DG. | Mathesiusite | K5(UO2)4(SO4)4(VO5) · 4H2O |
7.DG.05 | Darapskite | Na3(SO4)(NO3) · H2O |
7.DG.10 | Clinoungemachite | (Na, K, Fe, SO4) |
7.DG.10 | Humberstonite | Na7K3Mg2(SO4)6(NO3)2 · 6H2O |
7.DG.10 | Ungemachite | K3Na8Fe(SO4)6(NO3)2 · 6H2O |
7.DG.15 | Bentorite | Ca6Cr2(SO4)3(OH)12 · 26H2O |
7.DG.15 | Charlesite | Ca6(Al,Si)2(SO4)2[B(OH)4](OH,O)12 · 26H2O |
7.DG.15 | Ettringite | Ca6Al2(SO4)3(OH)12 · 26H2O |
7.DG.15 | Jouravskite | Ca3Mn4+(SO4)(CO3)(OH)6 · 12H2O |
7.DG.15 | Sturmanite | Ca6Fe3+2(SO4)2.5[B(OH)4](OH)12 · 25H2O |
7.DG.15 | Thaumasite | Ca3(SO4)[Si(OH)6](CO3) · 12H2O |
7.DG.15 | Carraraite | Ca3(SO4)[Ge(OH)6](CO3) · 12H2O |
7.DG.15 | Buryatite | Ca3(Si,Fe3+,Al)(SO4)B(OH)4(OH,O)6 · 12H2O |
7.DG.15 | Birunite | Ca18(SiO3)8.5(CO3)8.5SO4 · 15H2O(?) |
7.DG.15 | Hielscherite | Ca3Si(SO4)(SO3)(OH)6 · 11H2O |
7.DG.15 | Imayoshiite | Ca3Al(CO3)[B(OH)4](OH)6 · 12H2O |
7.DG.15 | Tatarinovite | Ca3Al(SO4)[B(OH)4](OH)6 · 12H2O |
7.DG.15 | Siwaqaite | Ca6Al2(CrO4)3(OH)12 · 26H2O |
7.DG.15 | Chiyokoite | Ca3Si(CO3)[B(OH)4]O (OH)5 · 12H2O |
7.DG.20 | Rapidcreekite | Ca2(SO4)(CO3) · 4H2O |
7.DG.25 | Tatarskite | Ca6Mg2(SO4)2(CO3)2(OH)4Cl4 · 7H2O |
7.DG.30 | Nakauriite | Cu8(SO4)4(CO3)(OH)6 · 48H2O |
7.DG.35 | Chessexite | (Na,K)4Ca2(Mg,Zn)3Al8(SO4)10(SiO4)2 · 40H2O |
7.DG.40 | Carlosruizite | K6(Na,K)4Na6Mg10(SeO4)12(IO3)12 · 12H2O |
7.DG.40 | Fuenzalidaite | K6(Na,K)4Na6Mg10(SO4)12(IO3)12 · 12H2O |
7.DG.45 | Chelyabinskite | (Ca,Mg)3(SO4,CO3)2[Si(OH)6] · 9H2O (?) |
7.DG.55 | Ramazzoite | [Mg8Cu12(PO4)(CO3)4(OH)24(H2O)20][(H0.33SO4)3(H2O)36] |
7.DG.60 | Witzkeite | Na4K4Ca(NO3)2(SO4)4 · 2H2O |
Other Information
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 Kottenheimite
mindat.org URL:
https://www.mindat.org/min-42534.html
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References for Kottenheimite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011, CNMNC Newsletter No. 10. Mineralogical Magazine, 75 (5) 2549-2561 doi:10.1180/minmag.2011.075.5.2549
Localities for Kottenheimite
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.
France | |
| publication date: November 2018 +1 other reference |
Germany (TL) | |
| Williams et al. (2011) +2 other references |
Italy | |
| Campostrini et al. (2018) |
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Caspar quarry, Ettringen, Vordereifel, Mayen-Koblenz, Rhineland-Palatinate, Germany