Assertion: black tourmaline | /r/AtLocation | addition
Facets:
value: to cassiterite
type: LOCATION
Source sentences:
text: The early history of the mineral schorl shows that the name "schorl" was in use prior to 1400 because a village known today as Zschorlau (in Saxony, Germany) was then named "Schorl" (or minor variants of this name), and the village had a nearby tin mine where, in addition to cassiterite, black tourmaline was found.