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Whewellite Mineral Data + |
General Whewellite Information |
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| Ca(C2O4)·(H2O) | |||
| 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 | |||
| CaC2O4·(H2O) | |||
| 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 | |||
| Valid Species (Pre-IMA) 1852 | |||
| 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. | |||
| Named after the British mineralogist, crystallographer and natural philosopher William Whewell (1794-1866), professor of mineralogy at Cambridge. | |||
| Calcium Oxalate | |||
| ICSD 30782 | |||
| PDF 20-231 | |||
Whewellite Image | |||
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Whewellite Crystallography |
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| a:b:c =0.431:1:0.6875 | |||
| a = 6.276, b = 14.561, c = 10.012, Z = 8; beta = 107.083° V = 874.58 Den(Calc)= 2.22 | |||
| Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 21/n | |||
| By Intensity(I/Io): 3.65(1), 5.93(1), 2.968(0.8), | |||
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Physical Properties of Whewellite |
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| [101] Good, [010] Good, [110] Good | |||
| Brownish, Colorless, Gray, Yellow, Yellow brown. | |||
| 2.21 - 2.23, Average = 2.21 | |||
| Transparent to translucent | |||
| Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments. | |||
| Granular - Generally occurs as anhedral to subhedral crystals in matrix. | |||
| Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). | |||
| Tabular - Form dimensions are thin in one direction. | |||
| 2.5-3 - Finger Nail-Calcite | |||
| Fluorescent. | |||
| Vitreous - Pearly | |||
| white | |||
Optical Properties of Whewellite |
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| CI meas= -1.077 (Poor) - where the CI = (1-KPDmeas/KC) CI calc= -1.077 (Poor) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2545,KPDmeas= 0.2545,KC= 0.1225 |
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| Biaxial (+), a=1.49, b=1.555, g=1.65, bire=0.1600, 2V(Calc)=84, 2V(Meas)=80. Dispersion none. | |||
| colorless. | |||
| colorless. | |||
| colorless. | |||
Calculated Properties of Whewellite |
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relectron=2.25 gm/cc |
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| Fermion Index = 0.00244 Boson Index = 0.99756 |
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PEWhewellite = 3.53 barns/electron |
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| GRapi = 0 (Gamma Ray American Petroleum Institute Units) Whewellite is Not Radioactive |
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Whewellite Classification |
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| 50.1.1.1 (50)Salts of Organic Acids | |||
| (50.1)(Oxalates) | |||
| (50.1.1)Dana Group | |||
| IX/A.01-10 IX - Organic compunds | |||
| IX/A - Oxalates. Salts from organic acids. [C2O4]2- arranged after increasing cation size | |||
| IX/A.01 - Whewellite - Wheatleyite series | |||
Other Whewellite Information |
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| NAME( Lapis) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) | |||
| Links to other databases for Whewellite : 1 -Am. Min. Crystal Structure Database 2 - Amethyst Galleries' Mineral Gallery 3 - Applied Mineralogy 4 -Athena 5 - Crocoite.com Mineral Locations 6 - EUROmin Project 7 -Google Images 8 -Google Scholar 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST 16 -École des Mines de Paris Search for Whewellite using: Visit our Advertisers for Whewellite : Translate Whewellite Mineral Data : Ask about Whewellite here : Print or Cut-and-Paste your Whewellite Specimen Label here :
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