Fe mg and ca and higher amounts up to 10 k na and

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Fe, Mg, and Ca, and higher amounts (up to 10%) K, Na and dissolved gasses (2-5%) Texture and Compositions Igneous rocks subdivided (named) based on texture(big/small, glass, or holes in the  rock) and composition (what minerals found in rock?) Texture and composition tell story of how these rocks are formed Texture of the Igneous rocks—phaneritic, aphanitic, porphyritic, glassy and vesicular Phaneritic—minerals are macroscopic in size, takes time for crystals to grow, texture  indicates slow cooling of magma Aphanitic—minerals are microscopic in size, texture indicates fast cooling of magma Porphyritic—mixed texture with macroscopic crystals embedded in matrix of microscopic  crystal, (looks like big chunks of minerals with fine grained material around them)  indicates a mixed cooling history for magma, slow then fast cooling Glassy—looks like glass, shiny and very smooth, can’t see any crystals, not even under  high magnification—indicates near instantaneous cooling Vesicular—igneous rocks with vesicles, vesicles are holes, usually spherical to tubular  to oval in shape, indicates gages escaped when the magma solidified Composition of igneous rocks determined by minerals present—mafic, felsic, and  intermediate.
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