A rock or stone that is primarily composed of diallage mineral, often used as a decorative or ornamental stone.
From diallage + -ite (suffix meaning rock or mineral composed of). The -ite suffix in mineralogy and geology indicates a specific type of rock made of the preceding mineral.
Diallagite is basically 'diallage rock'—when diallage is the main mineral in a stone, geologists call it diallagite, and because of its beautiful iridescent sheen, it's sometimes cut and polished for decorative uses.
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