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Champions of Equestria

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Description

Kinda sorta requested by a Background Pony.
 
The joke is that corundum is 9 on the Mohs hardness scale of minerals while quartz is only 7.

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Source

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Hydis

The hardness scale was created by geologist Friedrich Mohs. Seems they couldn’t come up with any horse puns. Have there been any other instances where the name of a human got into the show?
That One Guy

That… is actually a pretty intelligent joke. Maud is climbing my ladder of favoritism.  
(For those who don’t know, Mohs Hardness scale is how they test the hardness of rocks.)
Background Pony #9A45
You did it! Yay!
 
So is Maud making a funny about school being hard, or just stating a fact she learned?