Macdonaldite
Chemical compound
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Macdonaldite is a rare barium silicate mineral with a chemical formula of BaCa₄Si₁₆O₃₆(OH)₂·10H₂O. Macdonaldite was first described in 1965 and named for Gordon A. Macdonald an American volcanologist at the University of Hawaii.
Macdonaldite... Wikipedia
Crystal system: Orthorhombic
Color: Colorless, white
Crystal class: Dipyramidal (mmm); H-M symbol: (2/m 2/m 2/m)
Crystal habit: Acicular also fibrous, in radiating aggregates; granular
Formula (repeating unit): BaCa4Si16O36(OH)2·10H2O
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