What is the streak of epidote?
Geologyone direction Cleavage Hardness Name Cleavage Hardness Name Perfect in one direction 6 to 7 ZOISITE (Epidote Group) Ca2Al3(SiO4)3(OH) Perfect in one direction 6½ to 7 SILLIMANITE Al2SiO5 Cleavage Hardness Name How many directions of cleavage does epidote have? one direction Cleavage Hardness Name Cleavage Hardness Name Perfect in one direction 6 to 7 ZOISITE
What are the most common felsic minerals?
GeologyThe most common felsic rock is granite. Common felsic minerals include quartz, muscovite, orthoclase, and the sodium-rich plagioclase feldspars (albite-rich). What are common felsic minerals? Common felsic minerals include quartz, muscovite mica, and the orthoclase feldspars. The most common felsic rock is granite, which represents the purified end product of the earth’s internal differentiation process.
What are the three main causes of plate tectonics?
GeologyWhat are three causes of plate movement? Mantle dynamics, gravity, and Earth’s rotation taken altogether causes the plate movements. However, convectional currents are the general thought for the motion. What is the main cause of plate tectonics on Earth? The force that causes most of the plate movement is thermal convection, where heat from the
What are the common rock forming minerals?
GeologyThe rock-forming minerals are: feldspars, quartz, amphiboles, micas, olivine, garnet, calcite, pyroxenes. Minerals occurring within a rock in small quantities are referred to as “accessory minerals”. Which is the most common rock forming mineral? silicates The most common rock-forming minerals are silicates (see Vol. IVA: Mineral Classes: Silicates), but they also include oxides, hydroxides, sulfides,
What is the use of siltstone?
GeologySiltstone Uses It is rarely mining for use as a construction material or manufacturing feedstock. The pore spaces of siltstone serve as good aquifer. It is rarely porous enough or extensive enough to serve as an oil or gas reservoir. Its main use is as a low-quality fill when better materials are not locally available.
When and how do earthquakes occur?
GeologyThe tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth’s crust and cause the shaking that we feel. When and where do earthquakes usually occur?
Is Yellowstone about to explode?
GeologyAlthough another catastrophic eruption at Yellowstone is possible, scientists are not convinced that one will ever happen. The rhyolite magma chamber beneath Yellowstone is only 5-15% molten (the rest is solidified but still hot), so it is unclear if there is even enough magma beneath the caldera to feed an eruption. Is Yellowstone going to
What happened Cenozoic Era?
GeologyLife during the Cenozoic Era The Cenozoic era is also known as the Age of Mammals because the extinction of many groups of giant mammals, allowing smaller species to thrive and diversify because their predators no longer existed. What events happened during Cenozoic Era? What major events happened in the Cenozoic Era? Cenozoic Era major
What is a plate science?
GeologyWhat is a plates in science? A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest. What is
Which type of foliation does phyllite have?
GeologyPhyllite has good fissility (a tendency to split into sheets). Phyllites are usually black to gray or light greenish gray in color. The foliation is commonly crinkled or wavy in appearance. Does phyllite have foliation? Phyllite is a foliated metamorphic rock rich in tiny sheets of sericite mica. It presents gradation in degree of metamorphism