natural rock specimen of eudialyte, a rarity minor gemstone, in nepheline syenite kola peninsula, on a white

aegirine artifact background bedrock close cluster cobble collection crystal crystalline crystals discovery eudalite eudialyte feldspar gem gemology gemstone geological geology isolated khibiny kola little macro matrix microcline mine mineral mineralogy natural nature nepheline object ore ornamental pebble peninsula raw resource resources rock rough russia specimen stone unprocessed white