- 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
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
C19: from Piedmont in Italy