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Urea Mineral Data
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General Urea Information
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 Chemical Formula: |
CO(NH2)2 |
| Composition: |
Molecular Weight = 60.06 gm |
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Hydrogen 6.71 % H |
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Carbon 20.00 % C |
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Nitrogen 46.65 % N |
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Oxygen 26.64 % O |
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______ |
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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 |
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PDF 28-2015 |
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Urea Image |
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Images:
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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 |
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Urea Crystallography
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| 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 - Scalenohedral H-M Symbol (4 2m) Space Group: P 421m |
| X Ray Diffraction: |
By Intensity(I/Io): 3.98(1), 3.04(0.3), 3.61(0.2), |
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Physical Properties of Urea
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| Color: |
Light brown, Light yellow. |
| Density: |
1.33 |
| Streak: |
yellow white |
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Optical Properties of Urea
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| Optical Data: |
Uniaxial (+), w=1.484, e=1.603, bire=0.1190. |
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Calculated Properties of Urea
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| Electron Density: |
Bulk Density (Electron Density)=1.42 gm/cc
note: Specific Gravity of Urea =1.33 gm/cc.
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| Fermion Index: |
Fermion Index = 0.46
Boson Index = 0.54 |
| Photoelectric: |
PEUrea = 0.26 barns/electron
U=PEUrea x rElectron Density= 0.37 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Urea is Not Radioactive |
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Urea Classification
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| Dana Class: |
50.04.06.01 (50)Salts of Organic Acids |
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(50.04)with miscellaneous formulae |
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(50.04.06)Dana Group |
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50.04.06.01 Urea CO(NH2)2 P 421m 4 2m |
| Strunz Class: |
10.CA.35 10 - ORGANIC COMPOUNDS |
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10.C - Miscellaneous Organic Minerals |
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10.CA -Miscellaneous Organic Materials |
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10.CA.35 Urea CO(NH2)2 P 421m 4 2m |
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Other Urea Information
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| 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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Print or Cut-and-Paste your Urea Specimen Label here :
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Urea
CO(NH2)2
Dana No: 50.04.06.01 Strunz No: 10.CA.35
Locality:
Notes:
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