Assertion: graphite's form | /r/HasProperty | amorphous
Facets:
value: sometimes
type: TEMPORAL
Source sentences:
text: Other forms of carbon are amorphous they lack a regular structure.
text: Coal, diamond, and graphite are the three allotropic forms in which carbon is found naturally.
text: Other forms—such as carbon black, charcoal, lampblack, coal, and coke—are sometimes called amorphous, but X-ray examination has revealed that these substances do possess a low degree of crystallinity.
text: Yet another form, called amorphous carbon, has no crystalline structure.