Siderite with Calcite from Dalnegorsk, Russia DS2570 meteorite picture sandstone exhibits a hardness

picture sandstone exhibits a hardness ranging from 6 to 7 on the Mohs scale

and it's commonly found in pegmatites

which rivals the finest opals

Owyhee Blue Opal is a specific type of opal that is found in the Owyhee region of eastern Oregon

Siderite with Calcite from Dalnegorsk, Russia DS2570 meteorite picture sandstone exhibits a hardnessSiderite with Calcite from Dalnegorsk, Russia Approx. Dimensions: 3x2x2. 5 inches Approx. Weight: 178 grams Locality: Nikolaevskiy Mine, Dalnegorsk, Russia Siderite with calcite specimens from Russia, specifically the renowned Nikolaevskiy Mine in Dalnegorsk, Primorsky Krai, are highly prized for their unique, often spherical, and complex, multi generational crystalline structures. These, mineral specimens from the Nikolaevskiy Mine in Dalnegorsk