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Gneiss
Metamorphic rock that forms under intense pressure and high temperature and that is made of quartz, feldspar, amphibole and mica. Gneiss represents the highest grade of metamorphic rock, which is characterized by alternating bands of dark and light-colored minerals, foliation (i.e., parallel alignment of planar minerals) and tight folding. This rock type is common at mid to deep levels of continental crust.
Geothermal Glossary
Word of the Week – Hydrothermal Eruption
Hydrothermal Eruption Rare explosive discharge of hot water and steam that is powerful enough to excavate a crater and lift rock fragments and its pulverized equivalents into the air to produce an apron deposit around the eruption vent.
Word of the Week – Illite
Illite A potassium-bearing mica-like clay mineral that is a product of hydrothermal alteration. It commonly replaces feldspars and other alumino-silicate minerals and it forms above ~220°C. It also reflects a weakly acidic pH condition in hydrothermal fluids.
Word of the Week – INSAR
INSAR Interferometric synthetic aperture radar is a technique that is deployed from aircraft or satellites in order to generate interferogram images. These are used to interpret surface deformation resulting from natural and human-related activities.