Mosasaurs are an extinct group of large marine reptiles. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meus...

Galena from Krushev Dol Mine, Madan District, Rhodope Mountains, Bulgaria Bright metallic galena crystals with mirror-like surface luster with mino...

Beautiful top quality hand-polished natural Imperial Rhodonite egg from Madagascar. It has an amazing pattern with vibrant hues of pink and red.  ...

Top quality, center-of-a-choice petrified wood egg from Madagascar. This incredible specimen is hand-polished and formed to an egg shape. It has an...

Top quality, center-of-a-choice petrified wood egg from Madagascar. This incredible specimen is hand-polished and formed to an egg shape. It has an...

Top quality, center-of-a-choice petrified wood egg from Madagascar. This incredible specimen is hand-polished and formed to an egg shape. It has an...

Top quality, center-of-a-choice petrified wood egg from Madagascar. This incredible specimen is hand-polished and formed to an egg shape. It has an...

This egg-shaped specimen of top-quality petrified wood is beautifully hand-polished and displays remarkable hues of brown, yellow, and orange in it...

Top quality, center-of-a-choice petrified wood egg from Madagascar. This incredible specimen is hand-polished and formed to an egg shape. It has an...

Translucent cubic purple fluorite crystals overgrown on top of a cluster of metallic luster sphalerite crystals. The fluorite surfaces are composed...

Red Quartz Hematite crystal cluster from Izizauen Alnif, Tarhbalt, Morocco. New 2014 find of lustrous brick red hematite included quartz crystal cl...

From Chenzhou Prefecture, Hunan Province, China Translucent pale-pink crystals of sharp flattened rhombohedral manganoan calcite in parallel format...

From Chenzhou Prefecture, Hunan Province, China Translucent pale-pink crystals of sharp flattened rhombohedral manganoan calcite in parallel format...

From Chenzhou Prefecture, Hunan Province, China Translucent pale-pink crystals of sharp flattened rhombohedral manganoan calcite in parallel format...

From Guilin Prefecture, Guangxi Zhuang Autonomous Region, China Aesthetic stalactitic formation of translucent tanish-orange scalenohedral calcite ...

From San Eugenio, Artigas Dept., Uruguay Large 7'' scalenohedral crystal of calcite on amethyst matrix accented by isolated cluster of colorless qu...

Beautiful specimen from Piedra Parada, Las Vigas de Ramirez, Veracruz, Mexico. Several purple amethyst quartz crystals on matrix with epidote micro...

Beautiful specimen from Piedra Parada, Las Vigas de Ramirez, Veracruz, Mexico. Many amethyst quartz crystals on matrix. The color varies from pink-...

Beautiful specimen from Piedra Parada, Las Vigas de Ramirez, Veracruz, Mexico. Lustrous deep-purple transparent amethyst quartz crystals surrounded...

From Mibladen, Atlas Mountains, Khénifra Province, Morocco  Here is an exceptional world class specimen of a cluster of hexagonal crystals of brigh...

From Mibladen, Atlas Mountains, Khénifra Province, Morocco  Here is an exceptional world class specimen of a cluster of hexagonal crystals of dark ...

From Mibladen, Atlas Mountains, Khénifra Province, Morocco  Here is an exceptional world class specimen of a cluster of hexagonal crystals of dark ...

Superb specimen of translucent red-brown Chocolate heulandite in a doube terminated wheat sheave aggregates with lustrous crystal faces on chalcedo...

Superb water-clear wedge-shaped barite crystals covering one face of tan-colored matrix. The barite crystals formed over botryoidal black oxide min...