On January 29, 1773, in Gernrode, Friedrich Mohs, geologist and mineralogist, was born.

On this day (January 29), 1773, in Gernrode, present-day Germany, Friedrich Mohs, a geologist and mineralogist, was born.
Carl Friedrich Christian Mohs was educated at the University of Halle and the Freiburg im Breisgau academy of mines, then spent a long period in Austria studying of mineralogy, becoming professor of the discipline at Graz in 1812. In 1818 he was appointed professor of mineralogy at the Freiburg mining academy. In 1826 he moved to teach in Vienna where he was additionally appointed superintendent of the imperial cabinet .
His most important work is the Treatise on Mineralogy (Grundriß der Mineralogie, 1825) and he is remembered for the creation of the Mohs scale of hardness still used for minerals.
On this scale, the relative hardness of minerals is ranked in increasing order of hardness based on ten common minerals: talc, gypsum, calcite, fluorite, apatite, orthoclase, quartz, topaz, corundum, and diamond .
Mohs defined the hardness of a mineral as the resistance of a mineral to being scratched. His Mohs Scale is one of the methods used to define the hardness of minerals, and is based on the principle that one substance can scratch softer ones, but not vice versa.
Mohs chose 10 minerals, assigning them a number comparable to hardness, and forming an increasing scale in which 1 (talc) was scratched by all the others, and 10 (diamond) could scratch all of them, but it was not scratched by any of the others on the scale. Thus each mineral scratches those below it on the scale, and is scratched by those above it.
As a curiosity to comment that a diamond is known as the hardest natural substance on Earth. It has a perfect score of 10 on the Mohs scale of mineral hardness. This means that a diamond can only be scratched by another diamond.
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- Hi Friedrich, what are you doing?
- Hi, I'm trying to assess a mineral hardness system
- how interesting
- do you want to try it?
-ok
- stand there
- here?
-if
- what now?
- you'll see
- AAAYYYYY! But what are you doing, miserable?
- I have thrown a mineral at your head and based on your response I can say that it has a hardness of 4 on the Friderich scale
- but what a brute you are
- do you like it?
- looks like a crap system to me
- really?
- I think you should improve it
- oops
- before someone slaps you a couple times
- okay, okay...

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