It's very shiny and layered. It has rough texture but spots with smooth red colored pieces.
closed as unclear what you're asking by Spencer, Fred, JeopardyTempest, daniel.neumann, Semidiurnal Simon Oct 22 '18 at 12:21
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That maybe garnet and not gemmy but what is refered to as industrial garnet which is used in abrasives for its hardness. Are there any facets or flats on any side? You can try a hardness test by trying to scratch a metal file or other steel surface with the mineral. If it can scratch steel its a good chance its garnet
This looks like silicon slag, an artificial material and not a rock. The silicon metal is occasionally alloyed with iron, which may explain the red stuff you're seeing - it could be rust.