Assertion: opal's host rock | /r/HasProperty | ironstone
Facets:
value: usually
type: DEGREE
Source sentences:
text: Formed in areas of Ironstone, Boulder Opals are created when the host rock (Ironstone) forms with/as part of the opal when the gem is formed in cracks/voids within the host rock.
text: Formed in areas of Ironstone, Boulder Opals are created when the host rock (Ironstone) forms with/as part of the opal when the gem is formed in cracks/voids within the host rock.
text: Boulder opals are cut with the natural host rock, ironstone, on the back.
text: Matrix Opal - Precious Opal interspersed within a host rock, usually ironstone or sandstone, where the Opal occurs as a network of veins or an infilling of pore spaces; usually displays “pinfire” color in the natural state.
text: Matrix Opal - Precious Opal interspersed within a host rock, usually ironstone or sandstone, where the Opal occurs as a network of veins or an infilling of pore spaces; usually displays “pinfire” color in the natural state.