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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.

Tags
safe2276569 screencap294905 apple bloom64808 applejack213558 big macintosh35866 granny smith6250 maud pie15854 pinkie pie272816 earth pony635905 pony1940688 hearthbreakers1325 animated133577 chest878 discovery family1136 discovery family logo11828 geology37 male520358 saddle bag8481 snow20597 stallion186077 subtitles2552 trunk130
Source

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