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 % H₂O

Carbon 13.19 % C 39.54 % C₂O₃

Oxygen 61.49 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaC₂O₄•3(H₂O)

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

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 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:

PE_Caoxite= 2.85 barns/electron
U=PE_Caoxite x rElectron 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
Locality:

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