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About CaoxiteHide

Ca(C2O4) · 3H2O
2 - 2½
Specific Gravity:
1.87 (Calculated)
Crystal System:
For the acronym of "Centennial Anniversary Of X-rays" and also for Calcium Oxalate.
This page provides mineralogical data about Caoxite.

Classification of CaoxiteHide

First published:

A : Salts of organic acids
B : Oxalates

Physical Properties of CaoxiteHide

2 - 2½ on Mohs scale
1.87 g/cm3 (Calculated)

Optical Data of CaoxiteHide

Biaxial (-)
RI values:
nα = 1.483 nβ = 1.516 nγ = 1.533
Max Birefringence:
δ = 0.050
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
relatively strong

Chemical Properties of CaoxiteHide

Ca(C2O4) · 3H2O

Crystallography of CaoxiteHide

Crystal System:

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0014895CaoxiteBasso 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 84-961997Cerchiara mine, Val di Vara, northern Apennines, Italy0293
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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)

Type Occurrence of CaoxiteHide

General Appearance of Type Material:
spherulitic and isolated aggregates, up to 0.5 mm across, consisting of colorless, stocky
Place of Conservation of Type Material:
Sezione di Mineralogia, Dipartimento di Scienze della Terra, Universita di Genova, Italy.
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 CaoxiteHide

Other Language Names for CaoxiteHide


Related Minerals - Nickel-Strunz GroupingHide

10.AB.Deveroite-(Ce)Ce2(C2O4)3 · 10H2OMon. 2/m : P21/b
10.AB.XFalottaiteMnC2O4 · 3H2OOrth.
10.AB.Uroxite [(UO2)2(C2O4)(OH)2(H2O)2] · H2OMon. 2/m : P21/b
10.AB.05HumboldtineFe2+(C2O4) · 2H2OMon. 2/m
10.AB.05LindbergiteMn2+(C2O4) · 2H2OMon. 2/m
10.AB.10GlushinskiteMg(C2O4) · 2H2OMon.
10.AB.15MoolooiteCu(C2O4) · 0.4H2OOrth.
10.AB.20StepanoviteNaMgFe3+(C2O4)3 · 8-9H2OTrig. 3m : P3c1
10.AB.25MinguzziteK3Fe3+(C2O4)3 · 3H2OMon. 2/m : P21/b
10.AB.30WheatleyiteNa2Cu(C2O4)2 · 2H2OTric.
10.AB.35ZhemchuzhnikoviteNaMgAl(C2O4)3 · 8H2OTrig. 3m : P3c1
10.AB.40WeddelliteCa(C2O4) · (2.5-x)H2OTet. 4/m : I4/m
10.AB.45WhewelliteCa(C2O4) · H2OMon. 2/m : P21/b
10.AB.55Oxammite(NH4)2(C2O4) · H2OOrth. 2 2 2 : P21 21 2
10.AB.65Coskrenite-(Ce)(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2OTric.
10.AB.70Levinsonite-(Y)(Y,Nd,La)Al(C2O4)(SO4)2 · 12H2OMon. 2/m
10.AB.75Zugshunstite-(Ce)(Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2OMon.
10.AB.80NovgorodovaiteCa2(C2O4)Cl2 · 2H2OMon. 2/m

Fluorescence of CaoxiteHide

None observed

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for CaoxiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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.
Jambor, J.L., Grew, E.S., Roberts, A.C. (1998) New mineral names. American Mineralogist: 83: 185-189.
Echigo, T., Kimata, M., Kyono, A., Shimizu, M., Hatta, T. (2005) Re-investigation of the crystal structure of whewellite [Ca(C2O4)·H2O] and the dehydration mechanism of caoxite [Ca(C2O4)·3H2O]. Mineralogical Magazine: 69: 77-88.
Piilonen, P.C., Ercit, T.S. (2005) New mineral names. American Mineralogist: 90: 1466-1469.
Echigo, T., Kimata, M. (2010) Crystal chemistry and genesis of organic minerals: A review of oxalate and polycyclic aromatic hydrocarbon minerals. The Canadian Mineralogist: 48: 1329-1358.
Piro, O.E., Baran, E.J. (2018) Crystal chemistry of organic minerals-salts of organic acids: the synthetic approach. Crystallography Reviews: 24: 149-175.
Mineralogical Record: 29: 234.

Internet Links for CaoxiteHide

Localities for CaoxiteHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
  • Liguria
    • La Spezia Province
      • Borghetto di Vara
[MinRec 32:211]
Mineral and/or Locality  
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