Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous name is from the Ancient Greek for "straight fracture," because its two cleavage planes are at right angles to each other. It is a type of potassium feldspar, also known as gem known as moonstone (see below) is largely composed of orthoclase.
Perthite is used to describe an intergrowth of two feldspars: a host grain of potassiumrich alkali feldspar (near Kfeldspar, KAlSi 3 O 8, in composition) includes exsolved lamellae or irregular intergrowths of sodic alkali feldspar (near albite, NaAlSi 3 O 8, in composition).Typically the host grain is orthoclase or microcline, and the lamellae are albite.
Complete online glossary of rocks, minerals, and gemstones.
List. Sorted by name; initial letter means Igneous, Sedimentary or Metamorphic rocks.. A I Andesite – an intermediate volcanic rock M Anthracite – a form of hard coal B S Banded iron formation – a fine grained chemical sedimentary rock composed of iron oxide minerals S Bauxite – the main ore of is mostly aluminium oxide. I Basalt – grey/black finegrained rock from lava ...
What is Granite? Granite is a lightcolored igneous rock with grains large enough to be visible with the unaided eye. It forms from the slow crystallization of magma below Earth's surface. Granite is composed mainly of quartz and feldspar with minor amounts of mica, amphiboles, and other mineral composition usually gives granite a red, pink, gray, or white color with dark mineral ...
About 200 minerals are called the rockforming minerals. These are the minerals that are listed and described below. More than % of the Earth's crust is composed of these minerals. This list of minerals and specific articles about each mineral species are all focused on minerals as they naturally occur within rocks and sediments.
Rock type is usually defined as a particular kind of rock having a specific set of characteristics types are specific assemblages of minerals (most rocks are composed of minerals).
Devils Head Pegmatite Mining District, Douglas Co., Colorado, USA : Devils Head is a prominent peak in the Rampart Range. It is easily reached from Sedalia on State Highway 85 via Highway 67 (Jarre Canyon Road) and Rampart Range road; the distance from Sedalia ...
Igneous rocks are those that form via the process of melting and cooling. If they erupt from volcanoes onto the surface as lava, they are called extrusive contrast, Intrusive rocks are formed from magma that cools underground. If the intrusive rock cooled underground but near the surface, it is called subvolcanic or hypabyssal, and often has visible, but tiny mineral grains.
Plutonic rocks are igneous rocks that are formed deep under the Earth's surface and have a coarse grain size. They can be separated into acidic, basic and ultrabasic types, according to their mineral and chemical composition.
LithiumCaesiumTantalum Projects. The Pioneer Dome Project is a highly prospective area of land with multicommodity potential, strategically located in Western Australia's Eastern Goldfields, approximately 130 km south of Kalgoorlie and 200 km north of the Port of Esperance.
A variety of K Feldspar A more ordered lowtemperature variety of Orthoclase or partially disordered localities should be verified because the adularia structural state is nearly equally represented by microcline and orthoclase specimens.
Orthoclase as a Feldspar Mineral. Orthoclase is a member of the alkali feldspar series. The alkali feldspars include albite (NaAlSi 3 O 8), anorthoclase ((Na,K)AlSi 3 O 8), sanidine ((K,Na)AlSi 3 O 8), orthoclase (KAlSi 3 O 8), and microcline (KAlSi 3 O 8).. These feldspar minerals form a solid solution series between NaAlSi 3 O 8 and KAlSi 3 O minerals in that series crystallize from ...
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