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Coral fragments?

It looks like some sort of igneous rock to me with poikilitic plagioclases but I could be wrong! There is one fragment close to the left lower quadrant kind of by the center that is heart shaped and appears to be weather in to be relief, only part that looks fossil like it me… very interesting rock!! I’ll ask one of my professors about it for you

i believe it’s called calligraphy stone. a name applied to various compositions of fossilized shells and sometimes other minerals, including Hematite