The Marble Institute of America has developed four classifications for marble. This classification system is based on how sound the material is. A class A marble would be the the most sound where as a class D marble is very weak. The following is a brief description of the classifications.
Class A: Sound marble with uniform and favorable working qualities. Class B: Similar in character to class A, but working qualities less favorable; occasional natural faults; limited amount of filling needed. Class C: Uncertain variation in working qualities; geological flaws, voids, veins and lines of separation common. Class D: Similar to class
CAUTION this classification system only applies to marble. Do not use this system to classify granite.
Article ID: 437
Created: January 20, 2022
Last Updated: January 20, 2022
Author: Pam Freitag
Online URL: https://sr-manual.com/kb/article/i-have-been-told-that-i-have-a-class-d-marble-which-is-very-brittle-what-does-this-mean-437.html