Assertion: calcite's crystal | /r/AtLocation | considerable numbers
Facets:
value: at wheal wrey in cornwall
type: LOCATION
value: formerly
type: TEMPORAL
value: of cleator moor in cumberland
type: LOCATION
Source sentences:
text: Fine crystals of prismatic habit twinned according to this law were formerly found in considerable numbers at Wheal Wrey in Cornwall, and of scalenohedral habit at Eyam in Derbyshire and Cleator Moor in Cumberland; those from the last two localities are known as "butterfly twins" or "heart-shaped twins" (fig.