Spherulite - Geometric Forms

Geometric Forms

As illustrated in the entry on granophyre, crystals of quartz and feldspar can crystallize in intricate intergrowths with geometric forms, sufficiently coarse to be easily distinguishable by means of the microscope. Often the quartz or the feldspar of the intergrowth extinguishes simultaneously with a crystal of either of these minerals lying in the center of the aggregate. These intergrowths crystallize from a melt, not in the solid state.

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