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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 – Hot Dry Rock
Hot Dry Rock Hot crystalline rock with essentially no porosity and lacking producible hot water. Geothermal production from hot dry rock reservoirs is the primary goal of EGS (enhanced geothermal system) research in which cold water is injected and hot fluid is...
Word of the Week – Hydraulic Fracture
Hydraulic Fracture A rock-hosted tensile fracture that is created by injection of fluid under high pressure.
Word of the Week – Hydraulic Gradient
Hydraulic Gradient The slope on the water table which promotes horizontal fluid flow in permeable rock units.