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This substantial specimen from Gachala, Cundinamarca, Colombia, features an iron cross twin of goethite pseudomorph after pyrite. The pyrite is com...

This substantial specimen from Gachala, Cundinamarca, Colombia, features an iron cross twin of goethite pseudomorph after pyrite. The pyrite is com...

This substantial specimen from Gachala, Cundinamarca, Colombia, features an iron cross twin of goethite pseudomorph after pyrite. The pyrite is com...

From Wulashan Au deposit, Wulashan mining district, Binhe New District, Baotou City (Baotou Prefecture), Inner Mongolia, China. Beautiful specimen ...

Lustrous transparent yellow-brown barite crystals completely covering one side of a double-sided plate of matrix. Yellow-metallic pyrite or chalcop...

Long cluster of large, blocky crystals of yellow-tan barite crystals. The barites are translucent and show internal growth phantoms   Weight: 451.7...

From Nandan County, Hechi, Guangxi, China Complex intersecting formation of lustrous gem translucent golden barite crystals with lustrous faces and...

From Nandan County, Hechi, Guangxi, China   Complex intersecting formation of lustrous gem translucent golden barite crystals with lustrous faces a...

Large, museum-quality, lustrous transparent deep golden calcite with small sphalerite crystal at the base of the crystal. Double terminated scaleno...

Large, museum-quality, lustrous transparent deep golden calcite with small sphalerite crystal at the base of the crystal. Double terminated scaleno...

Lustrous transparent deep golden calcite crystal on matrix. Large double terminated scalenohedral twinned on the C-axis with well defined re-entran...

Large, museum-quality, lustrous transparent deep golden calcite with small sphalerite crystal at the base of the crystal. Double terminated scaleno...

Massive twinned rhombohedral calcite crystals with rich orange to yellow color all throughout. Fully terminated with lustrous crystals faces with s...

From Elk Creek, Meade County, South Dakota Large, museum-quality, lustrous transparent deep golden calcite on matrix. Double terminated scalenohedr...

Lustrous transparent deep golden calcite crystal on matrix. Large double terminated scalenohedral twinned on the C-axis with well defined re-entran...

Lustrous transparent deep golden calcite crystal on matrix. Large double terminated scalenohedral twinned on the C-axis with well defined re-entran...

Lustrous transparent deep golden calcite crystal on matrix. Large double terminated scalenohedral twinned on the C-axis with well defined re-entran...

Lustrous transparent deep golden calcite crystal on matrix. Large double terminated scalenohedral twinned on the C-axis with well defined re-entran...

From Tieshan District, Huangshi Prefecture, Hubei Province, China Lustrous translucent large blocky golden rhombohedral crystals of calcite in a st...

From Elmwood Mine, Carthage, TennesseeSingle double terminated twinned crystal of rich golden calcite on matrix lined with metallic luster sphaleri...

From Elmwood Mine, Carthage, TennesseeLarge aesthetic cluster of highly lustrous black sphalerite crystals on a quartz coated matrix with micro gol...

From Nasik District, Maharashtra, India   Large translucent double penetrating twinned crystals of calcite on translucent to transparent apophyllit...

Large shallow vug with a transparent penetrating twinned golden calcite on druzy chalcedony matrix in stalactitic formations with several isolated ...

From Nasik District, Maharashtra, India Large geode with a transparent penetrating twinned golden calcite on druzy chalcedony matrix in stalactitic...