M.J. Hibbard

Heulandite

Heulandite   (Ca,Na₂)Al₂Si₇O₁₈6H₂O    Monoclinic
o Low-T hydrothermal (vapor phase) in cavities in basalt. (chapter 12)
- Characteristic coffin-shaped crystal dominated by {010} form is elongate in c-axis direction (2 cm). Bombay, India. Specimen provided by H. Gordon.

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