- an unusual zeolite, a hydrated barium silicate that types vitreous white monoclinic crystals.
- A hydrous silicate of alumina and baryta, occurring usually in white cruciform crystals; cross-stone.
- A mineral belonging to the zeolite team, generally occurring in cruciform twin crystals which differ in color from white to yellow, purple, or brown. It's a hydrous silicate of aluminum and barium. Sometimes called cross-stone and andreolite.
Synonym for "harmotome"
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