M.J. Hibbard

Beryl

Beryl   Be₃Al₂Si₆O₁₈    Hexagonal
o Granitic pegmatite environment. (chapter 11)
- Aquamarine beryl (vitreous light bluish green) associated with muscovite (lower right). Hexagonal prisms with hexagonal dipyramid and basal pinacoid terminations. Longest crystal is 3.5 cm. Espirito Santo, Minas Gerais, Brazil. Specimen provided by H. Gordon.

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