Assertion: opal | /r/CapableOf | form within infillings of pores or holes
Facets:
Source sentences:
text: Matrix Opals are silicified sandstone or ironstone which has opal forming within infillings of pores or holes or between grains of the host rock.
text: Matrix Opals are silicified sandstone or ironstone which has opal forming within infillings of pores or holes or between grains of the host rock.