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Urea

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Formula:
CO(NH2)2
Colour:
Colourless, pale yellow, pale brown
Specific Gravity:
1.33
Crystal System:
Tetragonal
Name:
The name is the common trivial name of this compound (derived from Greek "oura", urine). The systematic name is carbonic acid diamide.
Derived from bat guano and urine, stable only under very arid conditions.


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Classification of UreaHide

Approved, 'Grandfathered' (first described prior to 1959)
Approval Year:
1972
First Published:
1973
10.CA.35

10 : ORGANIC COMPOUNDS
C : Miscellaneous Organic Minerals
A : Miscellaneous Organic Minerals
50.4.6.1

50 : ORGANIC COMPOUNDS
4 : Miscellaneous
32.13

32 :

Physical Properties of UreaHide

Transparency:
Translucent
Colour:
Colourless, pale yellow, pale brown
Streak:
yellowish white
Density:
1.33 g/cm3 (Measured)    
Comment:
Sink- float method in Nujol and α-bromonaphthalene.

Optical Data of UreaHide

Type:
Uniaxial (+)
RI values:
nω = 1.484 nε = 1.603
Max Birefringence:
δ = 0.119
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low

Chemical Properties of UreaHide

Formula:
CO(NH2)2

Crystallography of UreaHide

Crystal System:
Tetragonal
Class (H-M):
4 2m - Scalenohedral
Space Group:
P4 21m
Cell Parameters:
a = 5.646(1) Å, c = 4.701(1) Å
Ratio:
a:c = 1 : 0.833
Unit Cell V:
149.86 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of UreaHide

General Appearance of Type Material:
Damp incoherent mass of crystals.
Place of Conservation of Type Material:
Western Australia Museum, Perth, Australia, S4688.
Geological Setting of Type Material:
Cave guano from warm arid environment.
Associated Minerals at Type Locality:

Synonyms of UreaHide

Other Language Names for UreaHide

German:Harnstoff

Related Minerals - Nickel-Strunz GroupingHide

10.CA.Tholins(C,H,N)
10.CA.05RefikiteC20H32O2Orth. 2 2 2 : P21 21 2
10.CA.10FlagstaffiteC10H22O3Orth.
10.CA.15HoeliteC14H8O2Orth.
10.CA.20AbelsoniteNi(C31H32N4)Tric. 1 : P1
10.CA.25KladnoiteC6H4(CO)2NHMon. 2/m
10.CA.30GuanineC5H5N5OMon.
10.CA.30Tinnunculite (of Chesnokov & Shcherbakova)C10H12N8O8Orth.
10.CA.40UriciteC5H4N4O3Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

32.1EvenkiteC21H44Orth. mmm (2/m 2/m 2/m) : Pbcm
32.2FichteliteC19H34Mon.
32.3SimonelliteC19H24Orth. mmm (2/m 2/m 2/m) : Pnna
32.4KratochvíliteC13H10Orth.
32.5IdrialiteC22H14Orth.
32.6CarpathiteC24H12Mon. 2/m : P21/b
32.7RefikiteC20H32O2Orth. 2 2 2 : P21 21 2
32.8FlagstaffiteC10H22O3Orth.
32.9HoeliteC14H8O2Orth.
32.10KladnoiteC6H4(CO)2NHMon. 2/m
32.11AcetamideCH3CONH2Trig. 3m : R3c
32.12GuanineC5H5N5OMon.
32.14UriciteC5H4N4O3Mon.
32.15AbelsoniteNi(C31H32N4)Tric. 1 : P1

Other InformationHide

Special Storage/
Display Requirements:
Stable only under very arid conditions.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for UreaHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Wohler, M.F. (1828) Artificial formation of urea. The Philosophical Magazine: 4: 309-310.
Worsham, J., Levy, H., Peterson, S. (1957) The positions of hydrogen atoms in urea by neutron diffraction. Acta Crystallographica: 10: 319-323.
Bridge, P.J. (1973) Urea, a new mineral, and neotype phosphammite from Western Australia. Mineralogical Magazine: 39: 346–348.
Fleischer, M. (1974) New mineral names. American Mineralogist: 59: 873-875.
Pryor, A.W., Sanger, P.L. (1970) Collection and interpretation of neutron diffraction measurements on urea. Acta Crystallographica: A26: 543-558.
Mullen, H.E (1978) A simple refinement of density distributions of bonding electrons. V. Bond electron density distribution in Urea, CO(NH2)2, at 123 K. Acta Crystallographica: B34: 1624-1627.
Swaminathan, S., Craven, B.M. (1984) The crystal structure and molecular thermal motion of urea at 12, 60 and 123 K from neutron diffraction. Acta Crystallographica: B40: 300-306.
Acta Crystallographica (1999).

Internet Links for UreaHide

Localities for UreaHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia (TL)
 
  • Western Australia
    • Laverton Shire
      • Lake Rason
Mineralogical Magazine (1973): 39: 346-348.
Saudi Arabia
 
  • Mintaqah Makkah
Saudi Geological Survey Open-File Report SGS-OF-2004-12, 68 p.
USA
 
  • Arizona
    • La Paz Co.
      • Buckskin Mts
        • Santa Maria District (Planet District; Swansea District; Bill Williams District)
          • Planet
A.R. Kampf
Mineral and/or Locality  
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