Ключевые слова: anisotropic, birefringent, bright, calcite, calcium, calcium carbonate, carbonate, clear, close, collection, crystal, crystalline, cube, decorative, gemmology, geology, healing crystals, iceland, iceland crystal, iceland spar, lustrous, macro, material, mineral, natural, nature, object, optical calcite, optics, orange, piece, polarization, raw, rock, rough, sample, shiny, spar, stone, structure, sunrise, sunset, surface cracks, texture, textured, translucent, transparent, unpolished, vitreous, white,