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Apophylite is a group of hydrous phyllosilicate minerals known for their glassy luster, pyramid or tabular crystal shapes, and tendency to flake apart when heated. Environment: Forms in cavities of basalt and other volcanic or igneous rocks, frequently alongside zeolite minerals like stilbite. Stilbite -Crystal Structure: Monoclinic, often forming tabular crystals with distinct bowtie or butterfly aggregates.