Siderite with Calcite from Dalnegorsk, Russia DS2570 mounted which is the phenomenon that

which is the phenomenon that produces the ethereal play-of-color when light interacts with the microscopic layers of feldspar within the stone

which was thought to form fibrous structures within the quartz

It is a basic carbonate and has been known since ancient times with Pliny the Elder calling it "kuanos"

Light: 5W RGB color changing LED with 5 diodes

Siderite with Calcite from Dalnegorsk, Russia DS2570 mounted which is the phenomenon thatSiderite 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