![](http://www.alamy.com/thumbs/6/2DE96F42-F32A-4FE9-9DD7-13C2C749141D/2RH5EAN.jpg)
Carl Friedrich Mohs 1773-1839 German Chemist Mineralogist
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Keywords: 6, 7, 8, 9, 10, ability, characteristics, classification, corundum, diamond, hardest, hardness, mineral, minerals, mohs, orthoclase, physical, portrait, quartz, scale, scratch, topaz, values