Caoxite Mineral Data
General Caoxite Information
Chemical Formula:
Ca(C2O4)•3(H2O)
Composition:
Molecular Weight = 182.14 gm
Calcium 22.00 % Ca 30.79 % CaO
Hydrogen 3.32 % H 29.67 % H2 O
Carbon 13.19 % C 39.54 % C2 O3
Oxygen 61.49 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
CaC2 O4 •3(H2 O)
Environment:
In open fractures (up to 0.5 mm wide) cutting manganese and barium rich mineralized metacherts.
IMA Status:
Approved IMA 1997 (Dana # Added)
Locality:
The Cerchiara mine, near Faggiona, Val di Vara, La Spezia, eastern Liguria, Italy. Link to MinDat.org Location Data.
Name Origin:
For the acronym of "Centennial Anniversary Of X-rays" and also for Calcium Oxalate.
Synonym:
ICSD 77096
IMA1996-012
PDF 20-232
Caoxite Image
Images:
Caoxite
Comments: Colorless to white crystals of caoxite on matrix.
Location: Cerchiara Mine, Faggiona, Vara valley, La Spezia province, Liguria, Italy.
Scale: Picture size 1.2 mm.
© Thomas Witzke / Abraxas-Verlag
Caoxite Crystallography
Axial Ratios:
a:b:c =0.8469:1:1.1802
Cell Dimensions:
a = 6.076, b = 7.174, c = 8.467, Z = 2; alpha = 76.65°, beta = 70.85°, gamma = 70.917° V = 320.58 Den(Calc)= 1.89
Crystal System:
Triclinic - Pinacoidal H-M Symbol ( 1 ) Space Group: P1
X Ray Diffraction:
By Intensity(I/Io ): 5.52(1),
Physical Properties of Caoxite
Cleavage:
{010} Good
Color:
Colorless.
Density:
1.85
Diaphaneity:
Transparent
Fracture:
Brittle - Uneven - Very brittle fracture producing uneven fragments.
Habit:
Spherical - Spherical, rounded aggregates.
Habit:
Tabular - Form dimensions are thin in one direction.
Hardness:
2-2.5 - Gypsum-Finger Nail
Luster:
Vitreous (Glassy)
Streak:
white
Optical Properties of Caoxite
Gladstone-Dale:
CI meas = -0.667 (Poor) - where the CI = (1-KPDmeas /KC ) CI calc = -0.667 (Poor) - where the CI = (1-KPDcalc /KC )
KPDcalc = 0.276,KPDmeas = 0.276,KC = 0.1655 Ncalc = 1.31
Optical Data:
Biaxial (-), a=1.483, b=1.516, g=1.533, bire=0.0500
Calculated Properties of Caoxite
Electron Density:
Bulk Density (Electron Density)=1.91 gm/cc note: Specific Gravity of Caoxite =1.85 gm/cc.
Fermion Index:
Fermion Index = 0.0020479048 Boson Index = 0.9979520952
Photoelectric:
PECaoxite = 2.85 barns/electronU=PECaoxite x r Electron Density= 5.45 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Caoxite is Not Radioactive
Caoxite Classification
Dana Class:
50.01.02.02 (50) Salts of Organic Acids
(50.01) (Oxalates)
(50.01.02) Weddellite Group
50.01.02.01 Weddellite Ca(C2O4)•2(H2O) I 4/m 4/m
50.01.02.02 Caoxite ! Ca(C2O4)•3(H2O) P1 1
Strunz Class:
10.AB.50 10 - ORGANIC COMPOUNDS
10.A - Salts of Organic Acids
10.AB -Oxalates
10.AB.50 Caoxite ! Ca(C2O4)•3(H2O) P1 1
Other Caoxite Information
References:
NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p185,1998) OPTIC PROP.(MinRec)
See Also:
Links to other databases for Caoxite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info
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Print or Cut-and-Paste your Caoxite Specimen Label here :
Caoxite
Ca(C2O4)•3(H2O)
Dana No: 50.01.02.02 Strunz No: 10.AB.50
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