Koroit Opals normally has good pattern which it is famous for. Koroit opal has mainly deep strong ironstone with magic patterns and inclusions of colour and are also generally larger sized opals. Source your Koroit opals direct from opal miners and opal wholesalers and dealers for your single gem opal or parcel Koroit opals from lightning ridge Australia Koroit opal is home of Koroit Boulder and Matrix opal,close by are the opal mining fields of Jundah and Opalton that also produces matrix opal,some of these thin colour bars can produce beautiful patterns.blackgate opal field has produced some dark stunning matrix opal,also named as aboriginal art opal . polished Conglomerate opal slabs from Koroit make top displays as natural patterns and kernels are unique and interesting.