Yesterday I finishing off the Dubliner Brand Cheese I bought one month ago and reviewed here (https://cheeseforum.org/forum/index.php/topic,1864.0.html) and who's cheese making recipe was discussed here (https://cheeseforum.org/forum/index.php/topic,500.0.html).
When cutting I noticed small white specs on the open faces, see picture below. I just went back to the product's website (http://www.kerrygold.com/intl/index.jsp?1nID=93&2nID=98&pID=103&nID=111) which says:
QuoteDubliner may contain naturally occurring calcium lactate crystals which appear as small white particles in the cheese. These crystals are a rich source of calcium.
So these must be the Calcium Lactate Crystals (https://cheeseforum.org/Glossary.htm#Calcium_Lactate_Crystals) that are found in older cheeses, I've just never seen so visible. When eaten, this crystals are like little explosions of taste in your mouth. Interesting that they are only on inside of cheese, not on soft rind.