Assertion: tourmaline | /r/ObjectUse | used for any mineral
Facets:
value: typically
type: DEGREE
value: the classroom,
type: LOCATION
Source sentences:
text: Because it can be impossible or impractical to determine the chemical composition of a large number of specimens or even a single specimen, the generic name "tourmaline" is typically used for any mineral in the tourmaline group in the field, the classroom, the office, or even in a laboratory.