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rasberry mica schist from Utah.   Primary minerals in schist is quartz, micas and amphiboles.

rasberry mica schist from Utah. Primary minerals in schist is quartz, micas and amphiboles.

Igneous rocks formed from lava flows of the Archaean era (>2,700 million years ago) are often found to contain disequilibrium-textured crystals characterized by spherulitic, branching or dendritic morphologies that occur in layers near the flow surface.

Igneous rocks formed from lava flows of the Archaean era (>2,700 million years ago) are often found to contain disequilibrium-textured crystals characterized by spherulitic, branching or dendritic morphologies that occur in layers near the flow surface.

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