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.
Read more about this topic: Spherulite
Other articles related to "geometric, geometric form, forms, geometric forms":
... The arabesques and geometric patterns of Islamic art are often said to arise from the Islamic view of the world ... is generally discouraged, which explains the preference for merely geometric patterns ... In the first mode, each repeating geometric form has a built-in symbolism ascribed to it ...
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