Is this Cyano?

Nathan73

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Hey guys, noticed a few dark purple spots on one of my rocks, could somebody help identify if it is Cyano or possibly coraline?
thankyou

A4AEC1D0-B377-4DEA-9096-3E2EF1C5E682.jpeg A9CDBABA-50A0-4884-8049-667B1DA70DD6.jpeg
 
Thanks guys, tried to rub some of it off this afternoon and it didn’t budge, so corraline it is
Appreciate all your help cheers :)
 

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