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

Classification of Caoxite


A : Salts of organic acids
B : Oxalates URL:
Please feel free to link to this page.

Type Occurrence of Caoxite

Physical Properties of Caoxite

Hardness (Mohs):
2 - 2½

Crystallography of Caoxite

Crystal System:
X-Ray Powder Diffraction Data:
7.92 (m)
5.26 (m)
5.52 (vs)
4.99 (m)
3.643 (m)
2.834 (s)
2.758 (m)

Optical Data of Caoxite

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 Caoxite

Ca(C2O4) · 3H2O
All elements listed in formula:

Relationship of Caoxite to other Species

10.AB.05HumboldtineFe2+(C2O4) · 2H2O
10.AB.05LindbergiteMn2+(C2O4) · 2H2O
10.AB.10GlushinskiteMg(C2O4) · 2H2O
10.AB.15MoolooiteCu(C2O4) · 0.4H2O
10.AB.20StepanoviteNaMgFe3+(C2O4)3 · 8-9H2O
10.AB.25MinguzziteK3Fe3+(C2O4)3 · 3H2O
10.AB.30WheatleyiteNa2Cu(C2O4)2 · 2H2O
10.AB.35ZhemchuzhnikoviteNaMg(Fe3+,Al)(C2O4)3 · 8H2O
10.AB.40WeddelliteCa(C2O4) · 2H2O
10.AB.45WhewelliteCa(C2O4) · H2O
10.AB.55Oxammite(NH4)2(C2O4) · H2O
10.AB.65Coskrenite-(Ce)(Ce,Nd,La)2(C2O4)(SO4)2 · 12H2O
10.AB.70Levinsonite-(Y)(Y,Nd,La)Al(C2O4)(SO4)2 · 12H2O
10.AB.75Zugshunstite-(Ce)(Ce,Nd,La)Al(C2O4)(SO4)2 · 12H2O
10.AB.80NovgorodovaiteCa2(C2O4)Cl2 · 2H2O

Other Names for Caoxite

Name in Other Languages:

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.

References for Caoxite

Reference List:
Mineralogical Record: 29: 234.

Neues Jahrbuch für Mineralogie, Monatshefte (1997): 1997(2): 84-96.

Internet Links for Caoxite

Localities for Caoxite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Italy (TL)
  • Liguria
    • La Spezia Province
      • Vara Valley
        • Borghetto Vara
[MinRec 32:211]
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