Urea Mineral Data

General Urea Information

Chemical Formula:

CO(NH2)2

Composition:

Molecular Weight = 60.06 gm

Hydrogen 6.71 % H

Carbon 20.00 % C

Nitrogen 46.65 % N

Oxygen 26.64 % O

______

100.00 %

Empirical Formula:

CO(NH₂)₂

Environment:

Derived from bat guano and urine, stable only under very arid conditions.

IMA Status:

Approved IMA 1973

Locality:

Toppin Hill, near Lake Rason, about 320 km northeast of Kalgoorlie, and in Wilgie Mia Cave, Western Australia. Link to MinDat.org Location Data.

Name Origin:

From the Greek for urine, in which urea was first found.

Name Pronunciation:

Urea

Synonym:

ICSD 29364

PDF 28-2015

Urea Image

Images:

Urea

Comments: SEM image of tetragonal prismatic crystals of urea.
Location: Ghar al Hibashi Harrat Nawasif/Al Buqum, Kingdom of Saudi Arabia. Scale: See Image.
© Saudi Geological Survey

Urea Crystallography

Axial Ratios:

a:c = 1:0.83262

Cell Dimensions:

a = 5.646, c = 4.701, Z = 2; V = 149.86 Den(Calc)= 1.33

Crystal System:

Tetragonal - ScalenohedralH-M Symbol (4 2m) Space Group: P 42₁m

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

By Intensity(I/I_o): 3.98(1), 3.04(0.3), 3.61(0.2),

Crystal Structure:

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Guth H , Heger G , Klein S , Treutmann W , Scheringer C , Zeitschrift fur Kristallographie , 153 (1980) p.237-254, Strukturverfeinerung von harnstoff mit neutronenbeugungsdaten bei, 60, 123, 293 K und X-N- und X-X (1s2)-synthesen bei etwa 100 K, Sample: T = 60 K

Physical Properties of Urea

Color:

Light brown, Light yellow.

Density:

1.33

Streak:

yellow white

Optical Properties of Urea

Optical Data:

Uniaxial (+), w=1.484, e=1.603, bire=0.1190.

Calculated Properties of Urea

Electron Density:

Bulk Density (Electron Density)=1.42 gm/cc
note: Specific Gravity of Urea =1.33 gm/cc.

Fermion Index:

Fermion Index = 0.46
Boson Index = 0.54

Photoelectric:

PE_Urea= 0.26 barns/electron
U=PE_Urea x rElectron Density= 0.37 barns/cc.

Radioactivity:

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

Urea Classification

Dana Class:

50.04.06.01 (50)Salts of Organic Acids

(50.04)with miscellaneous formulae

(50.04.06)Dana Group

50.04.06.01 Urea CO(NH2)2 P 42₁m 4 2m

Strunz Class:

10.CA.35 10 - ORGANIC COMPOUNDS

10.C - Miscellaneous Organic Minerals

10.CA -Miscellaneous Organic Materials

10.CA.35 Urea CO(NH2)2 P 42₁m 4 2m

Other Urea Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

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

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Ask about Urea here :
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Print or Cut-and-Paste your Urea Specimen Label here :

Urea

CO(NH2)2
Dana No: 50.04.06.01 Strunz No: 10.CA.35
Locality:

Notes: