The rarest gemstone in the world is considered to be ... of 5.5. It formed deep underground in a pegmatite — an igneous rock. Its chemical formula is Bi³⁺Sb⁵⁺O₄ with traces of tantalum.

Large crystals found in geodes and other rocks are relatively rare. Pink ChalcedonyA pink chalcedony shows off its beauty. Chalcedonies include many types of cryptocrystalline quartz gems and ...

The world's rarest gemstone is made of kyawthuite ... Investigations revealed that it likely formed deep underground in a ...

Whether you're really into rocks or just quartz-curious, Kansas City has a source for the minerals, crystals and fossils you ...

PT Rocks and Gems, which offers crystals, stones, jewelry and decor, has opened in the Crossroads Center Mall. Owner Phil ...

PT Rocks and Gems, which offers crystals, stones, jewelry and decor, has opened in the Crossroads Center Mall. Owner Phil Barrett operated a seasonal booth at the mall and visited statewide events ...