Whewellite Mineral Data

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General Whewellite Information

Chemical Formula:

Ca(C2O4)•(H2O)

Composition:

Molecular Weight = 146.11 gm

Calcium 27.43 % Ca 38.38 % CaO

Hydrogen 1.38 % H 12.33 % H₂O

Carbon 16.44 % C 49.29 % C₂O₃

Oxygen 54.75 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaC₂O₄•(H₂O)

Environment:

The mineral is deposited from low temperature hydrothermal solutions which have come into contact with carboniferous lithologies, releasing methane, such as in graphitic schists or, primarily, from areas surrounding coa

IMA Status:

Valid Species (Pre-IMA) 1852

Locality:

The classic locality occurs in the anthracite deposits of the Doehlener Basin of Freital and Burgk, where clear crystals of up to 2 cm, mostly twinned, are found in association with ca Link to MinDat.org Location Data.

Name Origin:

Named after the British mineralogist, crystallographer and natural philosopher William Whewell (1794-1866), professor of mineralogy at Cambridge.

Name Pronunciation:

Whewellite + Pronunciation

Synonym:

Calcium Oxalate

ICSD 30782

PDF 20-231

Whewellite Image

Images:

Whewellite

Comments: Colorless, twinned crystal of Whewellite.
Location: Burgk, near Dresden, Saxony, Germany. Scale: Crystal size 7 mm.
© Thomas Witzke / Abraxas-Verlag

Images:

Whewellite

Comments: White crystal of whewellite, perched on a spray of brown calcite crystals.
Location: Shaft 21, Schlema, Hartenstein, Germany. Scale: 7 x 6 x 4 cm.
© Rob Lavinsky

Whewellite Crystallography

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

By Intensity(I/I_o): 3.65(1), 5.93(1), 2.968(0.8),

Forms:

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Forms: ( 0 1 4) ( 0 1 0) ( 1 2 0) ( 1 1 0) ( 1 0 0) ( 0 0 1)

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Crystal Structure:

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Tazzoli V , Domeneghetti M C , American Mineralogist , 65 (1980) p.327-334, The crystal structures of whewellite and weddellite: re-examination and, comparison

Physical Properties of Whewellite

Color:

Brownish, Colorless, Gray, Yellow, Yellow brown.

Optical Properties of Whewellite

Gladstone-Dale:

CI meas= -1.077 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -1.041 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.25,KPDmeas= 0.2545,KC= 0.1225
Ncalc = 1.27 - 1.28

Calculated Properties of Whewellite

Electron Density:

Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Whewellite =2.26 gm/cc.

Fermion Index:

Fermion Index = 0.0024436466
Boson Index = 0.9975563534

Photoelectric:

PE_Whewellite= 3.53 barns/electron
U=PE_Whewellite x rElectron Density= 8.08 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Whewellite is Not Radioactive

Whewellite Classification

Dana Class:

50.01.01.01 (50)Salts of Organic Acids

(50.01)(Oxalates)

(50.01.01)Dana Group

50.01.01.01 Whewellite Ca(C2O4)•(H2O) P 2₁/c 2/m

Strunz Class:

10.AB.45 10 - ORGANIC COMPOUNDS

10.A - Salts of Organic Acids

10.AB -Oxalates

10.AB.45 Whewellite Ca(C2O4)•(H2O) P 2₁/c 2/m

Other Whewellite Information

See Also:

Links to other databases for Whewellite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - QUT Mineral Atlas
15 - Ruff.Info
16 - WWW-MINCRYST

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Ask about Whewellite here :
Ask-A-Mineralogist from the Mineralogical Society of America
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Print or Cut-and-Paste your Whewellite Specimen Label here :

Whewellite

Ca(C2O4)•(H2O)
Dana No: 50.01.01.01 Strunz No: 10.AB.45
Locality:

Notes: