Kochsándorite
A valid IMA mineral species
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About Kochsándorite
Prof. Sándor Koch
Formula:
CaAl2(CO3)2(OH)4 · H2O
Colour:
Colourless
Lustre:
Vitreous, Silky
Hardness:
2 - 2½
Specific Gravity:
2.486
Crystal System:
Orthorhombic
Member of:
Name:
Named after Sándor Koch (16 August 1896, Cluj-Napoca, Romania - 25 May 1983, Szeged, Hungary), former professor of mineralogy, petrography and geochemistry at the University of Szeged, Hungary. He wrote 'The History of Minerals in Hungary' and 'Minerals of Hungary'. He was the coauthor of the descriptions of fülöppite and mátraite.
Type Locality:
Unique Identifiers
Mindat ID:
27424
Long-form identifier:
mindat:1:1:27424:9
GUID
(UUID V4):
(UUID V4):
2f6beb27-ddc0-40e1-9b37-5c13e8a0fd4f
IMA Classification of Kochsándorite
Classification of Kochsándorite
5.DB.10
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
5 : CARBONATES (NITRATES)
D : Carbonates with additional anions, with H2O
B : With large and medium-sized cations
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 |
|---|---|---|
| Ksd | 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 Kochsándorite
Vitreous, Silky
Transparency:
Transparent
Comment:
Silky in aggregates.
Colour:
Colourless
Comment:
Larger aggregates are white to pale brown.
Streak:
White
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
None observed
Density:
2.486(20) g/cm3 (Measured) 2.514(2) g/cm3 (Calculated)
Optical Data of Kochsándorite
Type:
Biaxial (-)
RI values:
nα = 1.597(3) nγ = 1.603(6)
Max Birefringence:
δ = 0.006
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
Dispersion:
r < v, weak.
Pleochroism:
Non-pleochroic
Comments:
2V could not be measured.
Chemistry of Kochsándorite
Mindat Formula:
CaAl2(CO3)2(OH)4 · H2O
Crystallography of Kochsándorite
Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnma
Cell Parameters:
a = 15.564(6) Å, b = 5.591(4) Å, c = 9.112(4) Å
Ratio:
a:b:c = 2.784 : 1 : 1.63
Unit Cell V:
792.9 ų
Z:
4
Morphology:
Forms, in order of prominence: {100}, {110}, {001} and {010}.
Twinning:
None observed.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.86 Å | (87) |
| 7.78 Å | (62) |
| 5.92 Å | (100) |
| 4.37 Å | (86) |
| 2.957 Å | (48) |
| 2.946 Å | (44) |
| 2.569 Å | (17) |
| 1.902 Å | (26) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 50 : Coal and/or oil shale minerals | <0.36 |
Type Occurrence of Kochsándorite
General Appearance of Type Material:
Spherical aggregates of acicular crystals up to 0.5 mm long, forming strings in massive coal.
Place of Conservation of Type Material:
Hungarian Natural History Museum, Budapest, Hungary, 568/2004.
Herman Otto Museum, Miskolc, Hungary, 2004.72.
Mineral Museum, Lajos Kövecses-Varga-Siofok, Hungary, 12004/1-3.
Herman Otto Museum, Miskolc, Hungary, 2004.72.
Mineral Museum, Lajos Kövecses-Varga-Siofok, Hungary, 12004/1-3.
Geological Setting of Type Material:
Coal mine.
Associated Minerals at Type Locality:
Synonyms of Kochsándorite
Other Language Names for Kochsándorite
German:Kochsandorit
Simplified Chinese:水羟碳钙铝石
Relationship of Kochsándorite to other Species
Member of:
Other Members of this group:
| Alumohydrocalcite | CaAl2(CO3)2(OH)4 · 4H2O | Tric. 1 : P1 |
| Dresserite | BaAl2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) |
| Dundasite | PbAl2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) |
| Grguricite | CaCr2(CO3)2(OH)4 · 4H2O | Tric. 1 : P1 |
| Hydrodresserite | BaAl2(CO3)2(OH)4 · 3H2O | Tric. 1 : P1 |
| Petterdite | PbCr3+2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) |
| Strontiodresserite | SrAl2(CO3)2(OH)4 · H2O | Orth. mmm (2/m 2/m 2/m) |
| Unnamed (Ca-analogue of Petterdite) | CaCr3+2(CO3)2(OH)4 · H2O |
Common Associates
Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 5.DB. | Grguricite | CaCr2(CO3)2(OH)4 · 4H2O |
| 5.DB.05 | Alumohydrocalcite | CaAl2(CO3)2(OH)4 · 4H2O |
| 5.DB.05 | Nasledovite | PbMn3Al4(CO3)4(SO4)O5 · 5H2O |
| 5.DB.05 | Para-alumohydrocalcite | CaAl2(CO3)2(OH)4 · 6H2O |
| 5.DB.05 | UM1977-02-CO:AlCaH | Ca6Al2(CO3)3O6 · 32H2O |
| 5.DB.10 | Dresserite | BaAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Dundasite | PbAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Montroyalite | Sr4Al8(CO3)3(OH,F)26 · 10-11H2O |
| 5.DB.10 | Strontiodresserite | SrAl2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Petterdite | PbCr3+2(CO3)2(OH)4 · H2O |
| 5.DB.10 | Unnamed (Ca-analogue of Petterdite) | CaCr3+2(CO3)2(OH)4 · H2O |
| 5.DB.15 | Hydrodresserite | BaAl2(CO3)2(OH)4 · 3H2O |
| 5.DB.20 | Schuilingite-(Nd) | PbCu(Nd,Gd,Sm,Y)(CO3)3(OH) · 1.5H2O |
| 5.DB.25 | Sergeevite | Ca2Mg11(CO3)9(HCO3)4(OH)4 · 6H2O |
| 5.DB.30 | Szymańskiite | [H3O]+8[Hg2]2+8(Ni,Mg)6[CO3]12(OH)12 · 3H2O |
| 5.DB.35 | Lusernaite-(Y) | Y4Al(CO3)2(OH)10F · 6H2O |
| 5.DB.40 | Putnisite | SrCa4Cr3+8(CO3)8SO4(OH)16 · 23H2O |
Fluorescence of Kochsándorite
Pale yellow under both short and long wave UV.
Other Information
IR Spectrum:
The strongest FTIR absorption bands are at 559, 973, 1361, 1445, 1520, 1574, 1652, 3145, 3452 and 3548 cm–1. The FTIR spectrum is very similar to that of dresserite and strontiodresserite.
Notes:
Dissolves quickly in dilute HCl with effervescence.
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 Kochsándorite
mindat.org URL:
https://www.mindat.org/min-27424.html
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References for Kochsándorite
Localities for Kochsándorite
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.
Greece | |
| Rieck et al. (2018) |
Hungary (TL) | |
| Sajó +1 other reference |
| Geoda/2007/1 +1 other reference |
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Coal Mine, Mány, Bicskei District, Fejér County, Hungary