piemontite Min.
(ˈpiːmɒntaɪt)
[ad. G. piemontit (G. A. Kenngott Das Mohs'sche Mineralsystem (1853) 75), f. Piedmont (It. Piemonte, lit. Mountain-foot), its locality + -ite 2 b.]
A brownish red or reddish black silicate of aluminium, iron, manganese, and calcium, resembling epidote; often called manganese epidote. Also called piedmontite.
Adopted in place of piedmontite as more in accord with the original Ger. spelling and with European practice.
| 1892 E. S. Dana Dana's Syst. Min. (ed. 6) 1125/3 (Index), Piedmontite 521. Piemontite, 521. 1950 Årsbok Sveriges Geologiska Undersökning XLIV. ii. 15 In some parts of the limestone,..crystalline masses of piemontite appear in zones measuring many meters in thickness. 1956 Mineral Mag. XXXI. 241 The piemontite from the schist is granular in form, ruby red, and has pearly lustre. 1971 Ibid. XXXVIII. 104 Recommendations of the Commission [on New Minerals and Mineral Names of the International Mineralogical Association] on minerals for which more than one name is in common use... Piemontite, not piedmontite. 1973 Canad. Jrnl. Earth Sci. X. 1401/1 Most piemontites are the product of metasomatic or low-grade regional metamorphism of manganiferous rocks. |