Ключевые слова: assay, chabazite, crystal, crystalline, element, facet, gem, gemstone, geology, industry, maglovec, manufacturing, material, matrix, mined, mineral, mineralogy, mining, natrolite, ore, pebble, petrography, phacolite, rock, science, shiny, slovakia, spherical, stone, structure, textured, translucent, white, zeolite,