Which of the following is not an allotropic variety of coal?

diamond
graphite
fullerene
anthracite
An allotropy is a phenomenon of appearing, in the same state of aggregation, of all sorts varieties of the same chemical element, differing in physical properties and chemical. Coal is appearing mainly in the form of diamond, graphite, fullerene and graphene. Anthracite is simply a variety of the hard bituminous coal.
Paweł Kołodziejczyk
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Answers by country

diamond
graphite
fullerene
anthracite
answers
flagGhana
6%
0%
20%
73%
15
flagMalaysia
18%
0%
18%
62%
16
flagRomania
0%
0%
45%
54%
11
flagIndia
10%
11%
24%
52%
418
flagAustralia
12%
10%
27%
49%
55
flagGreece
7%
0%
46%
46%
13
flagthe United Kingdom
14%
9%
34%
40%
135
flagSingapore
6%
20%
33%
40%
15
flagPoland
11%
10%
40%
37%
6587
flagSwitzerland
20%
12%
25%
37%
24
flagUnknown
6%
20%
36%
33%
30
flagthe Netherlands
8%
16%
41%
33%
12
flagPakistan
14%
16%
37%
31%
48
flagthe Philippines
21%
15%
32%
30%
46
flagCanada
15%
12%
42%
30%
33
flagthe United States
16%
23%
32%
27%
452
flagGermany
14%
15%
46%
22%
178
flagNigeria
25%
17%
41%
16%
56
flagAustria
17%
10%
57%
14%
28
flagUkraine
33%
40%
20%
6%
15