spherulite
spherulite (adj. spherulitic) A spherical to ellipsoidal aggregate of radiating, fibrous crystals, usually quartz and alkali feldspar, found in glassy or felsitic, aphanitic groundmasses of igneous rocks. Spherulites range in diameter from less than 1 mm to about 1 m and are formed by the devitrification of quenched glassy igneous rocks which are usually silicic in composition.
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Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Quartzite , quartzite A metamorphic rock composed mainly of quartz and usually formed by the metamorphism of quartz sandstones. If deformation has accompanied me… Aphanitic , Aphanitic
Crystalline rocks with mineral grains that cannot be distinguished from one another without magnification have an aphanitic igneous texture… Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… Rock , rock1 / räk/ • n. 1. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underly… Metamorphic Rocks , Metamorphic rock is rock that has changed from one type of rock into another. The word metamorphic (from Greek) means “of changing form.” Metamorphic…
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spherulite