Relating to or describing a crystal form having seven and six faces; combining heptahedral and hexahedral characteristics.
From Greek 'hepta' (seven) + 'hexa' (six) + 'hedron' (face) + '-al'. A specialized crystallographic term used in mineralogy.
Minerals sometimes grow with combined crystal faces—a heptahexahedral crystal might display seven faces on one zone and six on another, creating beautiful asymmetric gemstones that collectors treasure!
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