A brown or black mineral of the epidote group consisting of a silicate of calcium, aluminum, iron, and manganese.
- It forms a series with clinozoisite and, together with a group of other minerals including zoisite, the allanites, and piemontite, is a dominant member of the epidote group.
- He reported that material previously said to be piemontite was actually a manganan epidote.
- Since the formation of piemontite is dependant of a high concentration of manganese it is commonly found together with other manganese minerals.
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