Assertion: talc's property | /r/ObjectUse | used as diagnostic criteria
Facets:
value: for minerals
type: PURPOSE
value: because of incomplete data
type: CAUSE
value: because of natural variation
type: CAUSE
value: rarely
type: DEGREE
Source sentences:
text: Some minerals exhibit electrical properties – for example, quartz is piezoelectric – but electrical properties are rarely used as diagnostic criteria for minerals because of incomplete data and natural variation.