IS 15807 1 2021 Methods of petrographic analysis of
METHODS OFPETROGRAPHIC ANALYSIS OF LIGNITE PART 1 DEFINITION OFTERMSRELATING TO PETROGRAPHIC ANALYSIS OF LIGNITE I SCOPE accumulation of partly decomposed plant debris 2 REFERENCE 3 DEFINITIONS NOTE Thisstandard is neither intended to be a comprehensive glossary of lignite petrographic terminology nor does it extend complete information to allow recognition of all the lignite