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A mineral group, 2[KFCa4 (Si8 O20 ).8H2 O] (fluorapophyllite) with F replaced by (OH) (hydroxyapophyllite) and K replaced by Na (natroapophyllite); occurs in square micaceous crystals as secondary minerals in cavities in igneous rocks. Syn: fisheye stone
Source: Dictionary of Mining, Mineral, and Related Terms

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