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ISO 7404-4:2025

Coal — Methods for petrographic analysis — Part 4: Method of determining microlithotype, carbominerite and minerite composition ISO 7404-4:2025

Publication date:   Oct 27, 2025

General information

60.60   Standard published   Oct 27, 2025

ISO

ISO/TC 27/SC 5 Methods of analysis

International Standard

73.040   Coals

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Scope

This document specifies a method, using a graticule with 20 crossline intersections, for determining the proportions of microlithotypes, carbominerite and minerite in coals. It applies only to determinations made on polished particulate blocks using reflected white light. Additional blue, blue-violet or UV light excitation for better identification of liptinite in fluorescence can be used especially for low rank coals.

Life cycle

PREVIOUSLY

WITHDRAWN
ISO 7404-4:2017

NOW

PUBLISHED
ISO 7404-4:2025
60.60 Standard published
Oct 27, 2025




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