apophyllite crystals from poona, india. it refers to a specific group of phyllosilicates

abstract antimony apophyllite beautiful beauty close closeup cluster copper crystal crystalline crystallized crystals cube cubic detail elegant fibrous fine formation gem gemmology gemstone geologists geology isolated macro material mineral mineralogy natural nature organic pattern phyllosilicates precious prism quartz raw rock sample semiprecious shape sharp specimen stone sulfosalt surface texture unique