Aloe petricola Pole-Evans, Trans. Roy. Soc. South Africa 5: 707 1917.;
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Northern Provinces as per POWO;
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Pictures taken on 26th Dec,14 at a plant nursery.
Is it Aloe vera or a Cultivar?
One more that looks close is Aloe vryheidensis. Please check.
I think more closer to Aloe petricola as suggested by … as per
http://pza.sanbi.org/aloe-petricola
https://worldofsucculents.com/aloe-petricola-stone-aloe/
https://garden.org/plants/view/116687/Stone-Aloe-Aloe-petricola/
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References:
POWO Catalogue of Life The Plant List Ver.1.1 WCSP IPNI
http://pza.sanbi.org/aloe-petricola
https://worldofsucculents.com/aloe-petricola-stone-aloe/
https://garden.org/plants/view/116687/Stone-Aloe-Aloe-petricola/