- a mineral, similar to epidote but containing manganese: found in schists and manganese ores.
Origin of piedmontite
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for piedmontite
Historical Examples of piedmontite
Amongst the latter, in Shikoku, there is an extremely interesting rock consisting largely of piedmontite.
- a dark red mineral occurring in metamorphic rocks: a complex hydrated silicate containing calcium, aluminium, iron, and manganese. Formula: Ca 2 (Al,Fe,Mn) 3 (SiO 4) 3 OH
Word Origin for piedmontite
C19: from Piedmont in Italy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012