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Comments: Colorful white opal on a sandstone matrix.
Location: Queensland, Australia.
Scale: 9 x 6 x 3 cm.
© Isaias Casanova / IC Minerals
Comments: Section of fossilized tree limb that is now completely replaced by black opal.
Location: Virgin Valley District, Humboldt Co., Nevada, USA.
Scale: 20x13x11 mm.
© John Betts - Fine Minerals
Opal: SiO2·n(H2O) Todorokite: (Na,Ca,K)2(Mn++++,Mn+++)6O12·3-4.5(H2O)
Comments: Dendritic todorokite in white opal.
Location: Brosso Mine, Ivrea, Torino, Piemonte, Italy.
Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species