Matrix Opal Classification
Brown With Seams Of Play-Of-Color
Precious Opal In Matrix, Natural Opal Type 3
Appearance, RI and fluorescence
Yowah opal is a boulder matrix opal that is cut to display the small seams mixed through out the ironstone. Mainside: boulder matrix opal from Queensland, Australia. Honduras opal: comes from Honduras and has a basalt matrix. Louisiana opal: has a quartzite matrix. Indonesian opal: has dark brown basalt matrix that appears black.