I do not mean a rock that is sparkly (hematite) or a rock with inclusions or intrusions. There is a scientific word for the sparkly bits in rocks, or a rock that has sparkles or small crystals. I learned it a few years ago in science but I cant remember it for the life of me. Help!
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They could be phenocrysts.
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pitholiths or phenocrysts or whatever the mineral is... probably mica or hematite or another metallic mineral
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in most cases it's a mineral called mica
http://en.wikipedia.org/wiki/Mica
http://en.wikipedia.org/wiki/Mica
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Mica