Olmiite on Calcite

N Chwanning II Mine, Kuruman, Republic of South Africa

Opal (polished)

Jalisco, Mexico

Opal: Rough and Cut

Shoa Province, Ethiopia

Datolite with Quartz

Dalnegorsk, Primorskij Kraj, Russia

Acanthite

Imiter, Atlas Mountains, Morocco

Opal var. Hyalite

San Luis Potosi, Mexico