Quartz, var. Herkimer Diamond

Ace of Diamonds Mine, Herkimer County, New York

Heulandite with Stilbite

Jalgon, Maharashtra State, India

Olmiite on matrix

N Chwanning II Mine, Kuruman, Republic of South Africa

Olmiite on Calcite

N Chwanning II Mine, Kuruman, Republic of South Africa

Corundum Var. Sapphire

Balangoda, near Ratnapura, Sabaragamuwa Province, Sri Lanka

Spinel (rough and cut)

Mogok, Sagaing District, Mandalay Division, Burma (Myanmar)