A rare hydrous magnesium silicate mineral, a form of chlorite that crystallizes in the monoclinic system.
Named after James Amedee, or derived from a person's name + -ite (suffix used in mineralogy). The -ite suffix is standard for naming minerals and indicates a rock or mineral.
Minerals named after people show how scientists get immortalized in geology — every time a geologist finds this rare crystal, they're essentially speaking the mineralogist's name who discovered or was honored in its naming.
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