One of the mysteries of the English language finally explained.
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.’
- ‘Since the formation of piemontite is dependant of a high concentration of manganese it is commonly found together with other manganese minerals.’
- ‘Piemontite has beautiful, high-order interference colors.’
- ‘He reported that material previously said to be piemontite was actually a manganan epidote.’
- ‘The limit of piemontite solid solubility is found near p=1.9 at the above conditions.’
Late 19th century: from Italian Piemonte (see Piedmont) + -ite.
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