Assertion: boulder opal | /r/HasProperty | opal
Facets:
value: often
type: TEMPORAL
value: in australia
type: LOCATION
value: basically
type: DEGREE
Source sentences:
text: Boulder Opals are basically Opals found in the Australian state of Queensland where precious Opal material is still connected to the rock in which it formed – most often ironstone and sometimes sandstone.
text: In Australia, boulder opal is often called "Type 2 Opal".
text: Boulder opals (opals in concretionary ironstone) are mined in Queensland from numerous localities in a zone extending from the Eulo and Cunnamulla district in the south and northwest for a distance of over 700 km to Kynuna in the north.