tourmalinization
tourmalinization A pneumatolytic (see PNEUMATOLYSIS) modification of a pre-existing igneous rock in which boron-rich, late-stage fluids react with the mineral assemblage of the primary rock (usually granite), eventually producing a rock consisting of tourmaline and quartz. Intermediate stages in the process, showing alkali feldspar partly replaced by rosettes of tourmaline, are commonly preserved in granites. Luxullianite, found at Luxulyan, Cornwall, is a fine example.
More From encyclopedia.com
Trachyte , trachyte Fine-grained volcanic rock of the alkaline series of intermediate rocks. Trachyte is the volcanic equivalent of syenite.
trachyte gritty vol… Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… 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… Country Rock , Country rock
The term country rock refers to a body of rock that receives or hosts an intrusion of a viscous geologic material. Intrusions into count… 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… Basic Rock , basic rock Rock with a relatively high concentration of iron, magnesium, and calcium, and with 45–53% of silica by weight. Examples include gabbro, w…
You Might Also Like
NEARBY TERMS
tourmalinization