Scale on which topaz is 8

• -- scale of hardness
• Earth science eponym
• ___ scale (hardness measure)
• Hardness scale inventor
• Mineralogist with a namesake scale
• Rock hardness scale
• ___ scale, on which talc is a 1
• Mineral-hardness scale name
• ___ scale of mineral hardness

Wikipedia Word definitions in Wikipedia
Mohs was an automobile make built by the Mohs Seaplane Corporation of Madison, Wisconsin ( United States ). Bruce Mohs, the company founder, built limited-production automobiles on chassis built to custom specifications by the International Harvester Company ...