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Acetamide

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Formula:
CH3CONH2
System:
Trigonal
Colour:
Colourless, grey
Hardness:
1 - 1½
Name:
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 Acetamide

Approved 1974
10.AA.20

10 : ORGANIC COMPOUNDS
A : Salts of organic acids
A : Formates, Acetates, etc.
50.4.7.1

50 : ORGANIC COMPOUNDS
4 : Miscellaneous
32.11

32 :
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First Recorded Occurrence of Acetamide

Place of Conservation of First Recorded Material:
Mining Museum, St. Petersburg Mining Institute, St. Petersberg, Russia;
A.E.Fersman Mineralogical Museum, Academy of Sciences, Moscow, Russia
Year of Discovery:
1974
Geological Setting of First Recorded Material:
In waste piles of a coal shaft. A seasonal mineral, appearing only in periods of dry weather.

Occurrences of Acetamide

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.

Physical Properties of Acetamide

Vitreous, Greasy
Colour:
Colourless, grey
Comment:
grey if included with carbonaceous material
Streak:
white
Hardness (Mohs):
1 - 1½
Fracture:
Conchoidal

Crystallography of Acetamide

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3c
Cell Parameters:
a = 11.44Å, c = 13.5Å
Ratio:
a:c = 1 : 1.18
Unit Cell Volume:
V 1,530.09 ų (Calculated from Unit Cell)
Z:
18
Morphology:
Crystals are prismatic, to 5 mm, with prominent {1120}; as small stalactites and in granular aggregates.
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.7 (100)
3.98 (90)
3.83 (10)
3.54 (90)
3.32 (30)
2.86 (80)
2.17 (10)
(

Optical Data of Acetamide

Type:
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:
Moderate

Chemical Properties of Acetamide

Formula:
CH3CONH2
Essential elements:
All elements listed in formula:

Relationship of Acetamide to other Species

10.AA.05FormicaiteCa(HCOO)2
10.AA.10DashkovaiteMg(HCOO)2 · 2H2O
10.AA.25CalclaciteCa(CH3COO)Cl · 5H2O
10.AA.30PaceiteCaCu(CH3COO)4 · 6H2O
10.AA.35HoganiteCu(CH3COO)2 · H2O
32.1EvenkiteC21H44
32.2 Fitchtelite
32.3SimonelliteC19H24
32.4KratochvíliteC13H10
32.5IdrialiteC22H14
32.6CarpathiteC24H12
32.7RefikiteC20H32O2
32.8FlagstaffiteC10H22O3
32.9HoeliteC14H8O2
32.10KladnoiteC6H4(CO)2NH
32.12GuanineC5H5N5O
32.13UreaCO(NH2)2
32.14UriciteC5H4N4O3
32.15AbelsoniteNi(C31H32N4)

Other Names for Acetamide

Name in Other Languages:

Other Information

Other Information:
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:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
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 Acetamide

Reference List:
Srebrodol'skii, B.I.:"Acetamide - a new mineral": Zapiski Vserossiyskogo Mineralogicheskogo Obshchestva (1975): 104(3): 326-328; American Mineralogist (1976) 61: 338 (abstract).

Windholz, M., Budavari, S., Blumetti, R.F., and Otterbein, E.S. (eds): The Merck Index, 10th ed., Merck & Co., Inc., Rahway (NJ, USA), 1983.

Srebrodol'skii, B.I. (1986) "Phases of mineral formation on spoil heaps of coal mines": Doklady Acad. Nauk SSSR: 290: 1730174.

Acta Crystallographica (1971) B27: 1094-1098.

Journal of Physical Chemistry (1992) 96: 668.

Internet Links for Acetamide

Localities for Acetamide

(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.
Ukraine
 
  • L'viv Oblast' (Lviv Oblast'; Lwiw 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
Mineral and/or Locality  
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