A rare mineral or a historical reference to a type of stone, sometimes used in geological classification systems.
The origin is uncertain but may relate to Greek akme (peak or point) or be derived from a proper noun in mineralogy. It appears primarily in 19th-century geological literature.
Many mineral names were created by 19th-century geologists who wanted to honor colleagues or describe crystal shapes—some of these names disappeared as science got better at identifying what minerals actually were.
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