Caoxite
A valid IMA mineral species
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About Caoxite
Formula:
Ca(C2O4) · 3H2O
Colour:
Colorless
Lustre:
Vitreous
Hardness:
2 - 2½
Specific Gravity:
1.87 (Calculated)
Crystal System:
Triclinic
Name:
For the acronym of "Centennial Anniversary Of X-rays" and also for Calcium Oxalate.
This page provides mineralogical data about Caoxite.
Unique Identifiers
Mindat ID:
6845
Long-form identifier:
mindat:1:1:6845:7
GUID
(UUID V4):
(UUID V4):
264a82fb-c868-4d10-8608-2760b1b026ca
IMA Classification of Caoxite
Approved
First published:
1997
Classification of Caoxite
10.AB.50
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
10 : ORGANIC COMPOUNDS
A : Salts of organic acids
B : Oxalates
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 |
---|---|---|
Cao | 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 Caoxite
Vitreous
Transparency:
Transparent
Colour:
Colorless
Streak:
White
Hardness:
2 - 2½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
{010}
{010}
Fracture:
Irregular/Uneven
Density:
1.87 g/cm3 (Calculated)
Optical Data of Caoxite
Type:
Biaxial (-)
RI values:
nα = 1.483(3) nβ = 1.516 nγ = 1.533(3)
2V:
Measured: 70° (2)
Max Birefringence:
δ = 0.050
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:
Low
Dispersion:
relatively strong
Chemistry of Caoxite
Mindat Formula:
Ca(C2O4) · 3H2O
Elements listed:
Crystallography of Caoxite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.097(1) Å, b = 7.145(1) Å, c = 8.434(1) Å
α = 76.54(1)°, β = 70.30(1)°, γ = 70.75(1)°
α = 76.54(1)°, β = 70.30(1)°, γ = 70.75(1)°
Ratio:
a:b:c = 0.853 : 1 : 1.18
Unit Cell V:
323.49 ų (Calculated from Unit Cell)
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) |
---|---|---|---|---|---|---|---|
0014895 | Caoxite | Basso R, Lucchetti G, Zefiro L, Palenzona A (1997) Caoxite, Ca(H2O)3(C2O4), a new mineral from the Cerchiara mine, northern Apennines, Italy Neues Jahrbuch fur Mineralogie, Monatshefte 1997 84-96 | 1997 | Cerchiara mine, Val di Vara, northern Apennines, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
7.92 Å | (m) |
5.26 Å | (m) |
5.52 Å | (vs) |
4.99 Å | (m) |
3.643 Å | (m) |
2.834 Å | (s) |
2.758 Å | (m) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
53 : Other minerals with taphonomic origins | <0.4 |
Type Occurrence of Caoxite
General Appearance of Type Material:
spherulitic and isolated aggregates, up to 0.5 mm across, consisting of colorless, stocky
crystals
crystals
Place of Conservation of Type Material:
Sezione di Mineralogia, Dipartimento di Scienze della Terra, Universita di Genova, Italy.
Geological Setting of Type Material:
veinlets cutting metamorphosed Mn–Ba-rich cherts in an obducted ophiolite.
Associated Minerals at Type Locality:
Reference:
Basso, R., Lucchetti, G., Zefiro, L., Palenzona, A. (1997) Caoxite, Ca(H2O)3(C2O4), a new mineral from the Cerchiara mine, northern Apennines, Italy. Neues Jahrbuch für Mineralogie, Monatshefte: 1997: 84-96.
Synonyms of Caoxite
Other Language Names for Caoxite
Related Minerals - Strunz-mindat Grouping
10.AB. | Deveroite-(Ce) | Ce2(C2O4)3 · 10H2O |
10.AB.X | Falottaite | MnC2O4 · 3H2O |
10.AB. | Uroxite | [(UO2)2(C2O4)(OH)2(H2O)2] · H2O |
10.AB. | Andreybulakhite | Ni(C2O4) · 2H2O |
10.AB. | Edwindavisite | Cu(C2O4)(NH3) |
10.AB.05 | Humboldtine | Fe2+(C2O4) · 2H2O |
10.AB.05 | Lindbergite | Mn2+(C2O4) · 2H2O |
10.AB.05 | Katsarosite | Zn(C2O4) · 2H2O |
10.AB.10 | Glushinskite | Mg(C2O4) · 2H2O |
10.AB.15 | Moolooite | Cu(C2O4) · nH2O |
10.AB.20 | Stepanovite | NaMgFe3+(C2O4)3 · 8-9H2O |
10.AB.25 | Minguzzite | K3Fe3+(C2O4)3 · 3H2O |
10.AB.30 | Wheatleyite | Na2Cu(C2O4)2 · 2H2O |
10.AB.35 | Zhemchuzhnikovite | NaMgAl(C2O4)3 · 8H2O |
10.AB.40 | Weddellite | Ca(C2O4) · (2.5-x)H2O |
10.AB.45 | Whewellite | Ca(C2O4) · H2O |
10.AB.47 | Fiemmeite | Cu2(C2O4)(OH)2 · 2H2O |
10.AB.50 | Middlebackite | Cu2C2O4(OH)2 |
10.AB.52 | Metauroxite | (UO2)2(C2O4)(OH)2(H2O)2 |
10.AB.55 | Oxammite | (NH4)2(C2O4) · H2O |
10.AB.60 | Natroxalate | Na2(C2O4) |
10.AB.60 | Phoxite | (NH4)2Mg2(C2O4)(PO3OH)2(H2O)4 |
10.AB.60 | Carboferriphoxite | [(NH4)K(H2CO3)][Fe3+(HPO4)(H2PO4)(C2O4)] |
10.AB.60 | Ferriphoxite | [(NH4)2K(H2O)][Fe3+(HPO4)2(C2O4)] |
10.AB.65 | Coskrenite-(Ce) | (Ce,Nd,La)2(C2O4)(SO4)2 · 12H2O |
10.AB.70 | Levinsonite-(Y) | (Y,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
10.AB.75 | Zugshunstite-(Ce) | (Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2O |
10.AB.80 | Novgorodovaite | Ca2(C2O4)Cl2 · 2H2O |
Fluorescence of Caoxite
None observed
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 Caoxite
mindat.org URL:
https://www.mindat.org/min-6845.html
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Please feel free to link to this page.
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References for Caoxite
Reference List:
Basso, R., Lucchetti, G., Zefiro, L., Palenzona, A. (1997) Caoxite, Ca(H2O)3(C2O4), a new mineral from the Cerchiara mine, northern Apennines, Italy. Neues Jahrbuch für Mineralogie - Monatshefte, 1997 (2) 84-96 doi:10.1127/njmm/1997/1997/84
Jambor, John L., Grew, Edward S., Roberts, Andrew C. (1998) New mineral names. American Mineralogist, 83. 185-189
Localities for Caoxite
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.
Italy (TL) | |
| The Mineralogical Record: 32: 211. +1 other reference |
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Cerchiara Mine, Borghetto di Vara, La Spezia Province, Liguria, Italy