Para-alumohydrocalcite
A valid IMA mineral species
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About Para-alumohydrocalcite
Formula:
CaAl2(CO3)2(OH)4 · 6H2O
Colour:
White
Hardness:
1½ - 2
Specific Gravity:
2.0
Name:
Named for the relation to alumohydrocalcite.
Related to alumohydrocalcite.
The crystal structure and the correct stoichiometry are unknown. Kolitsch (2018) measured a Ca:Al ratio of about 1:1.2, unlike the ratio in the originally proposed formula (1:2).
The crystal structure and the correct stoichiometry are unknown. Kolitsch (2018) measured a Ca:Al ratio of about 1:1.2, unlike the ratio in the originally proposed formula (1:2).
Unique Identifiers
Mindat ID:
3078
Long-form identifier:
mindat:1:1:3078:2
GUID
(UUID V4):
(UUID V4):
d344a867-7404-4256-919f-3b95683381cf
IMA Classification of Para-alumohydrocalcite
Approved
Classification of Para-alumohydrocalcite
5.DB.05
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
16b.2.3.2
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
2 : AmBn(XO3)pZqxH2O & with (m+n):p = 3:2
16b : HYDRATED CARBONATES CONTAINING HYDROXYL OR HALOGEN
2 : AmBn(XO3)pZq
11.7.8
11 : Carbonates
7 : Carbonates of Al
11 : Carbonates
7 : Carbonates of Al
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 |
---|---|---|
Pahcal | 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 Para-alumohydrocalcite
Optical Data of Para-alumohydrocalcite
Type:
Biaxial (-)
RI values:
nα = 1.473 nβ = 1.492 nγ = 1.502
2V:
Measured: 69° , Calculated: 70°
Max Birefringence:
δ = 0.029
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:
none
Chemistry of Para-alumohydrocalcite
Mindat Formula:
CaAl2(CO3)2(OH)4 · 6H2O
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.90 Å | (100) |
6.20 Å | (30) |
4.04 Å | (20) |
3.90 Å | (25) |
3.32 Å | (28) |
2.68 Å | (24) |
2.64 Å | (32) |
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] |
Type Occurrence of Para-alumohydrocalcite
Co-Type Localities:
General Appearance of Type Material:
radially fibrous
Place of Conservation of Type Material:
A.E. Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia, 81064.
Reference:
Srebrodol’skii, B.I. (1977) Paraalumohydrocalcite – a new mineral. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 106: 336-337.
Synonyms of Para-alumohydrocalcite
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 | 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 | Kochsándorite | CaAl2(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 |
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 Para-alumohydrocalcite
mindat.org URL:
https://www.mindat.org/min-3078.html
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References for Para-alumohydrocalcite
Reference List:
Localities for Para-alumohydrocalcite
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.
Austria | |
| Kolitsch (2018) |
Germany | |
| Blass |
Romania | |
| Kristály et al. (2009) |
Russia (TL) | |
| Pekov (1998) |
Turkmenistan (TL) | |
| Pekov (1998) |
UK | |
| Alabaster (1990) +1 other reference |
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Şaru Dornei, Suceava County, Romania