Mineral hardness scale inventor Friedrich
Else clues• ___ scale
• ___ scale (hardness measure)
• ___ scale (mineral hardness measure)
• ___ scale (mineral hardness numbers)
• ___ scale (of hardness)
• ___ scale of mineral hardness
• ___ scale: talc-to-diamond
• -- scale (mineral hardness gauge)
• Assigner of 10 to diamond
• Eponymous German mineralogist
• Eponymous mineralogist
• Eponymous scale developer
• German geologist who gave his name to a hardness scale
• German mineralogist
• German mineralogist Friedrich
• Hardness gauge, the ___ scale
• Hardness scale
• Hardness scale creator
• Hardness scale eponym
• Hardness scale inventor
• Hardness-scale designer
• Hardness-scale name
• Inventor of a mineral hardness scale
• Kind of scale
• Maker of a scale of hardness
• Mineral hardness scale inventor
• Mineral scale
• Mineral scale name
• Mineral-hardness scale
• Mineralogist Friedrich
• Mineralogist with a scale
• Mineralogy hardness scale name
• Mineralogy scale
• Quartz = 7, to him
• Rock hardness scale
• Scale discussed in earth science class
• Scale for minerals
• Scale in which diamond=10
• Scale in which topaz is 8
• Scale on which diamond is 10
• Scale on which diamond rates a 10
• Scale on which this puzzle is based
• Scale that measures hardness
• Scale where gypsum is 2
• Scale where talc rates a 1
• Talc-to-diamond scale
• Topaz = 8, to him