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Auto-imported from derpibooru.org (1009089)
Upvotes at import: 93 | Stars at import: 63
Posted previously at: 2015-10-24T20:39:53 | Posted previously by: A Sad Pony
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.
Upvotes at import: 93 | Stars at import: 63
Posted previously at: 2015-10-24T20:39:53 | Posted previously by: A Sad Pony
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