Caoxite Mineral Data

Caoxite Mineral Data

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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 - PinacoidalH-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

Diaphaniety:

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= -0.632 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2702,KPDmeas= 0.276,KC= 0.1655

Optical Data:

Biaxial (-), a=1.483, b=1.516, g=1.533, bire=0.0500

Calculated Properties of Caoxite

Electron Density:

r_electron=1.95 gm/cc
note: r_Caoxite=1.89 gm/cc.

Fermion Index

Fermion Index = 0.00204
Boson Index = 0.99796

Photoelectric:

PE_Caoxite= 2.85 barns/electron
U=PE_Caoxite x r_electron= 5.57 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Caoxite is Not Radioactive

Caoxite Classification

Dana Class:

50.1.2.2 (50)Salts of Organic Acids

(50.1)(Oxalates)

(50.1.2)Dana Group

50.1.2.1 Weddellite Ca(C2O4)·2(H2O) I 4/m 4/m

50.1.2.2 Caoxite ! Ca(C2O4)·3(H2O) P1 1

Strunz Class:

IX/A.01-25 IX - Organic compunds

IX/A - Oxalates. Salts from organic acids. [C2O4]2- arranged after increasing cation size

IX/A.01 - Whewellite - Wheatleyite series

IX/A.01-05 Natroxalate! Na2C2O4 P 2₁/a 2/m

IX/A.01-10 Whewellite Ca(C2O4)·(H2O) P 2₁/n 2/m

IX/A.01-20 Weddellite Ca(C2O4)·2(H2O) I 4/m 4/m

IX/A.01-25 Caoxite Ca(C2O4)·3(H2O) P1 1

IX/A.01-28 Novgorodovaite! Ca2(C2O4)Cl2·2(H2O) I2/m 2/m

IX/A.01-30 Oxammite (NH4)2(C2O4)·(H2O) P 2₁2₁2 2 2 2

IX/A.01-40 Glushinskite Mg(C2O4)·2(H2O) C 2/c 2/m

IX/A.01-50 Humboldtine Fe(C2O4)·2(H2O) I2/a 2/m

IX/A.01-55 Lindbergite! Mn(C2O4)·2(H2O) C 2/c 2/m

IX/A.01-60 Minguzzite K3Fe(C2O4)3·3(H2O) P 2₁/c 2/m

IX/A.01-70 Zhemchuzhnikovite NaMg(Al,Fe)(C2O4)3·8(H2O) Unk Trig

IX/A.01-80 Stepanovite NaMgFe(C2O4)3·8-9(H2O) Unk Trig

IX/A.01-90 Moolooite Cu(C2O4)·n(H2O)(n<1) Unk Ortho

IX/A.01-100 Wheatleyite Na2Cu(C2O4)2·2(H2O) P1 1

IX/A.01-110 Coskrenite-(Ce)! (Ce,Nd,La)2(SO4)2(C2O4)·8(H2O) C 2/c 2/m

IX/A.01-120 Levinsonite-(Y)! (Y,Nd,La)Al(SO4)2(C2O4)·12(H2O) P 2/n 2/m

IX/A.01-130 Zugshunstite-(Ce)! (Ce,Nd,La)Al(SO4)2(C2O4)·8(H2O) C 2/c 2/m

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 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Caoxite

Ca(C2O4)·3(H2O)
Dana No: 50.1.2.2 Strunz No: IX/A.01-25
Locality:

Notes: