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About AcetamideHide

Colourless, grey
Vitreous, Greasy
1 - 1½
Crystal System:
Named for the chemical compound it represents: Acetic acid amide. Acetamide is the common short name (trivial name) of this compound.
Naturally occurring acetamide (acetic acid amide).

Classification of AcetamideHide

Approval Year:

A : Salts of organic acids
A : Formates, Acetates, etc.

4 : Miscellaneous

32 :

Physical Properties of AcetamideHide

Vitreous, Greasy
Colourless, grey
grey if included with carbonaceous material
1 - 1½ on Mohs scale

Optical Data of AcetamideHide

Uniaxial (-)
RI values:
nω = 1.495 nε = 1.460
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:

Chemical Properties of AcetamideHide


Crystallography of AcetamideHide

Crystal System:
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
Cell Parameters:
a = 11.44 Å, c = 13.5 Å
a:c = 1 : 1.18
Unit Cell V:
1,530.09 ų (Calculated from Unit Cell)
Crystals are prismatic, to 5 mm, with prominent {1120}; as small stalactites and in granular aggregates.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0009394AcetamideDenne W A, Small R W H (1971) A refinement of the structure of rhombohedral acetamide Acta Crystallographica B27 1094-10981971synthetic0293
0019020AcetamideJeffrey G A, Ruble J R, McMullan R K, DeFrees D J, Binkley J S, Pople J A (1980) Neutron diffraction at 23 K and ab initio molecular-orbital studies of molecular structure of acetamide Acta Crystallographica B36 2292-22991980synthetic023
CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

Powder Diffraction Data:
5.7 Å(100)
3.98 Å(90)
3.83 Å(10)
3.54 Å(90)
3.32 Å(30)
2.86 Å(80)
2.17 Å(10)

Geological EnvironmentHide

Geological Setting:
In burning waste coal heaps, formed between 50 degrees C and 150 degrees C. Also at At Shamokin, near Burnside, Northumberland Co., Pennsylvania, USA.

Type Occurrence of AcetamideHide

Place of Conservation of Type Material:
Mining Museum, St. Petersburg Mining Institute, St. Petersberg, Russia;
A.E.Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia
Geological Setting of Type Material:
In waste piles of a coal shaft. A seasonal mineral, appearing only in periods of dry weather.
Srebrodol’skii B I (1975) Acetamide CH3CONH2 - a new mineral. Zapiski Vsesoyuznogo Mineralogicheskogo Obshchestva 104, issue 3, 326-328

Synonyms of AcetamideHide

Other Language Names for AcetamideHide

Related Minerals - Nickel-Strunz GroupingHide

10.AA.10DashkovaiteMg(HCOO)2 · 2H2OMon. 2/m : P21/b
10.AA.25CalclaciteCa(CH3COO)Cl · 5H2OMon. 2/m : P21/b
10.AA.30PaceiteCaCu(CH3COO)4 · 6H2OTet.
10.AA.35HoganiteCu(CH3COO)2 · H2OMon. 2/m : B2/b

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

32.1EvenkiteC21H44Orth. mmm (2/m 2/m 2/m) : Pbcm
32.3SimonelliteC19H24Orth. mmm (2/m 2/m 2/m) : Pnna
32.6CarpathiteC24H12Mon. 2/m : P21/b
32.7RefikiteC20H32O2Orth. 2 2 2 : P21 21 2
32.10KladnoiteC6H4(CO)2NHMon. 2/m
32.13UreaCO(NH2)2Tet. 4 2m : P4 21m
32.15AbelsoniteNi(C31H32N4)Tric. 1 : P1

Other InformationHide

Melting point: 81°C
Boiling point: 221°C (at 1.013 bar)
Acetamide is readily soluble in water (solubility: 2 g/ml at ambient temperature). Taste very bitter; volatilises on exposure to air and sunlight.
Decomposes to ammonium acetate in contact with acids or alkali.
Health Risks:
Acetamide is classified as a potentially carcinogenic substance. It also is a mild irritant.
Industrial Uses:
In the past, acetamide was used as a plasticiser and as a stabiliser. Molten acetamide was frequently used as a solvent in chemical synthesis. It also acts as a solubiliser; its mere addition renders many sparingly soluble compounds more soluble in water.

References for AcetamideHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Srebrodol'skii, B.I. (1975) Acetamide - a new mineral. Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva: 104(3): 326-328.
Fleischer, M., Chao, G.Y., Mandarino, J.A. (1976) New mineral names. American Mineralogist: 61: 338-341.
Windholz, M., Budavari, S., Blumetti, R.F., Otterbein, E.S., editors (1983) The Merck Index, 10th ed., Merck & Co., Inc., Rahway (NJ, USA).
Srebrodol'skii, B.I. (1986) Phases of mineral formation on spoil heaps of coal mines. Doklady Acad. Nauk SSSR: 290: 1730174.
Denne, W.A., Small, R.W.H. (1971) A refinement of the structure of rhombohedral acetamide. Acta Crystallographica: B27: 1094-1098.
Wong, M.W., Wiberg, K.B. (1992) Structure of acetamide: Planar or nonplanar? Journal of Physical Chemistry: 96: 668-671.
Jeffrey G A, Ruble J R, McMullan R K, DeFrees D J, Binkley J S, Pople J A (1980) Neutron diffraction at 23 K and ab initio molecular-orbital studies of molecular structure of acetamide. Acta Crystallographica B36, 2292-2299

Internet Links for AcetamideHide

Localities for AcetamideHide

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

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
  • Silesian Voivodeship
    • Wodzisław County
      • Radlin
Łukasz Kruszewski (2012) Unique chloride assemblage of exhalative origin from burning coal-mining dump in Radlin (Rybnik Coal Area, S Poland). Mineralogical Society of Poland Special Papers 40; Kruszewski, Ł., Fabiańska, M.J., Segit, T., Kusy, D., Motyliński, R., Ciesielczuk, J., Deput, E., (2019): Carbon-nitrogen compounds, alcohols, mercaptans, monoterpenes, acetates, aldehydes, ketones, SF6, PH3, and other fire gases in coal-mining waste heaps of Upper Silesian Coal Basin (Poland) – a re-investigation by means of in situ FTIR external database approach. Science of The Total Environment (in press)
Ukraine (TL)
  • Lviv Oblast
    • L'viv-Volynskii Coal Basin (L'vov-Volynskii Coal Basin)
      • Chervonograd
[ZVMO 104 (1975), 326; Clark, 1993 - "Hey's Mineral Index, 3rd Edition"]; Pekov, I. (1998) Minerals First discovered on the territory of the former Soviet Union 369p. Ocean Pictures, Moscow
  • Pennsylvania
    • Northumberland Co.
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