orthoclase feldspar microcline

  • ORTHOCLASE (Potasium Aluminum Silicate)

    Orthoclase is a polymorph of other minerals that share the same chemistry, but have different crystal structures. If positive identification between these minerals can not be made by field methods, then the specimen may simply be referred to as a potassium feldspar or K-spar.Plagioclase feldspars lack potassium, are light colored and are usually striated.

  • Microcline | Geology Page

    Jun 07, 2014 · Microcline (KAlSi 3 O 8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase.

  • Microcline Mineral Physical - Optical Properties, Uses ...

    Microcline is one of the most common feldspar minerals. It can be colorless, white, cream to pale yellow, salmon pink to red, or bright green to blue-green. Microcline forms short prismatic or tabular crystals that are often of considerable size: single crystals can weigh several tons and reach yards in length.

  • Feldspar

    Common alkali feldspars are orthoclase, microcline, adularia, and sanidine. Plagioclase feldspars are albite, oligoclase, andesine, labradorite, bytownite, and anorthite. This rock sample (alkali feldspar syenite) does not contain much more than red-colored alkali feldspar.

  • Feldspar Value, Price, and Jewelry Information ...

    Moonstone is an orthoclase feldspar and amazonite is microcline. All other feldspars are in the plagioclase series. Exceptions: Moonstone is usually an orthoclase feldspar, but occasionally it is a labradorite. The RI will easily separate them.. Labradorite is the most common faceted feldspar. Exception: Sunstone can be labradorite or oligoclase.

  • Orthoclase - NOVA Mineralogy

    Orthoclase is frequently known as potassium feldspar or K-spar, and is easily distinguished from the plagioclase feldspars in hand sample by its lack of striations. In thin section, alkali feldspar grains often look like they're sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the alkali feldspar .

  • Microcline - Sandatlas

    Microcline is a very common rock-forming mineral. It belongs to the feldspar group. It is one of three K-feldspars (K means Potassium). The other two are orthoclase and sanidine. The chemical formula of K-feldspars: KAlSi 3 O 8, but they usually contain sodium as well which replaces potassium. Microcline with perthitic exsolution.

  • Microcline - NOVA Mineralogy

    "Tartan plaid" or "plaid" twinning is a combination of albite and pericline twinning. It is the dead giveaway of microcline. In thin section, alkali feldspar grains often look like they're sprinkled with dirt (PPL) or tiny confetti (XPL). You can find the explanation on the alkali feldspar page. Physical Properties Chemical formula KAlSi3O8 Class Tectosilicate … Continue ...

  • Microcline: Mineral information, data and localities.

    Name given in 1830 by Johann Friedrich August Breithaupt to a reddish to brownish feldspar from Arendal, Norway, and a feldspar with bluish schiller from Stavern (formerly Fredrichsvärn), Norway, from the Greek μικρός (little) and κλινειν (to incline), in allusion to .

  • Orthoclase vs Plagioclase - What's the difference? | WikiDiff

    As nouns the difference between orthoclase and plagioclase is that orthoclase is (mineralogy) potassium]] aluminum silicate, kalsi3[[oxygen|o8, a common feldspar of igneous, plutonic, and metamorphic rocks orthoclase is the main feldspar of pegmatite occurrences, where it is most commonly flesh-colored orthoclase is used in the ceramic and glass industries and as a decorative .

  • Alkali Feldspar GeosecMIA - GEOSEC Slides

    Alkali Feldspar (Click PPL image to show labels) Orthoclase in a granite from Fionnphort, Isle of Mull. Large orthoclase (alkali feldspar) crystal with string perthite .

  • Microcline | Gem5

    Microcline is a silicate of potassium and aluminum, and an alkali member of the feldspar group. It is the phase of this compound that is stable at low temperature. The feldspars are major constituents of the rocks on the earth's crust and comprise some of...

  • Feldspar minerals make up over 50% of Earth's crust.

    Crushed and powdered feldspar are important raw materials for the manufacture of plate glass, container glass, ceramic products, paints, plastics and many other products. Varieties of orthoclase, labradorite, oligoclase, microcline and other feldspar minerals have been .

  • MICROCLINE Facts & Information

    Adularia is an unusual gem variety of the potassium feldspar orthoclase. It exhibits an iridescence most commonly known as moonstone (also known as adularescence), which is due to diffused light reflection from microscopic parallel intergrowths of albite and orthoclase. Index of microcline information topics


    unaltered orthoclase to places where all orthoclase is completely inverted to microcline. Complete gradations occur, however, in some Precambrian granulites, but in these rocks deformation and shifting to lower grade metamorphic conditions (lower T-P) likely aids the total inversion of orthoclase to microcline (Eskola, 1952).

  • Orthoclase - Wikipedia

    Orthoclase, or orthoclase feldspar (endmember formula K Al Si 3 O 8), is an important tectosilicate mineral which forms igneous rock. The 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 K-feldspar.

  • Orthoclase | mineral | Britannica

    The feldspar minerals are mixtures of sodium, potassium, and calcium aluminosilicates, and any feldspar may be classed by its percentage of each of these three pure compounds, called end-members. Orthoclase is the potassium-bearing end-member of the system; its symbol is Or.

  • Microcline - Handbook of Mineralogy · PDF file

    Microcline KAlSi3O8 °c 20 1M i nera lD t Pub sh g, v o . Crystal Data: Triclinic. Point Group: 1: Prismatic crystals elongated along [001] or [100], perhaps the largest of any species, to 50 m and 13,500 t.

  • Microcline: The feldspar mineral Microcline information ...

    Microcline is polymorphous with Orthoclase and Sanidine.These three minerals form the Potassium Feldspar group.They are almost identical in physical properties, and sometimes it is impossible to distinguish one another without x-ray analysis.

  • Microcline – Geology Today

    Varieties : When colored a deep green, microcline is given the name amazonite shown in Figure 5 (refer also to Plate 8.3). Related Minerals : Related minerals include the other KAlSi3O8 poly-morphs, orthoclase, microcline, adularia, and perthite (see orthoclase), and the plagioclase feldspar series.

  • Orthoclase

    The differences between these minerals are minor in hand samples. Microcline tends to be deeper-colored and is the only one that can be, but is not always, a blue-green color (amazonite). Orthoclase does not show the lamellar twinning that is common in microcline and is occassionally present as striations on cleavage surfaces.

  • * Orthoclase feldspar (Jewelry) - Definition,meaning ...

    Orthoclase Feldspar Information Orthoclase Feldspar is considered as one of the most well-known minerals, and exists in several stone environments. It is a type of polymorphous specifically, Sanidine and Microcline. These minerals were originated from the Potassium Feldspar group.

  • Orthoclase Mineral Data

    Excalibur Mineral Corp. Google Search for Orthoclase Exceptional Minerals Google Search for Orthoclase John Betts Fine Minerals Search for Orthoclase McDougall Minerals Google Search for Orthoclase Mineral News Website Link Rock and Mineral Shows Google Search for Orthoclase Weinrich Minerals, Inc. Google Search for Orthoclase. Ask about ...

  • Microcline | Geology Wiki | Fandom

    Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar stable at yet higher ...

  • Feldspar

    Microcline is a triclinic K-feldspar and has a characteristic cross-hatched tartan pattern of twinning seen with a petrographic microscope. Orthoclase and sanidine are both optically monoclinic K-feldspars, but differ in acute angle between the optic axes (can be determined with a petrographic microscope).

  • Microcline | Definition of Microcline at Dictionary

    Microcline definition, a mineral of the feldspar group, potassium aluminum silicate, KAlSi3O8, identical in composition with orthoclase but having triclinic instead of monoclinic crystals, used in .

  • Feldspar | Minerals Education Coalition

    The minerals included in this group are the orthoclase, microcline and plagioclase feldspars. Relation to Mining. The top states producing feldspar are North Carolina, ia, California, Oklahoma, Idaho, Georgia and South Dakota, in descending order of estimated tonnage. Feldspar processors reported co-product recovery of mica and silica sand.

  • K-Feldspar - University of Glasgow

    Structural varieties: Sanidine, Orthoclase, Microcline. Mixed K-Na compositions unmix into two feldspars during slow cooling = Perthite (Microperthite = K-feldspar host with plagioclase exsolution lamellae only visible with a microscope) K-feldspar (with plagioclase inclusion) in Granite and simple twinning

  • Gallery of Feldspars - ThoughtCo

    Feldspars are a group of closely related minerals that together make up the majority of the Earth's crust. All of them have a hardness of 6 on the Mohs scale, so any glassy mineral that's softer than quartz and cannot be scratched with a knife is very likely to be a feldspar.

  • Orthoclase | Gem5

    Orthoclase mineral is a silicate of potassium and aluminum, belonging to the Feldspar group. It has the same composition as microcline, but is stable at slightly higher temperatures. It occurs as prismatic, sometimes flat-sided crystals, but in rocks it ...

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