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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.The gem known as moonstone (see below) is largely composed of orthoclase.

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 thin section - Tectosilicates - MicROCKScopic

Orthoclase – from Greek for straight and fracture, in reference to the cleavage angle, which is 90°. Feldspar (mineral group name), from Swedish names for field (feldt or falt) and spar (spat), in reference to the spar in tilled fields overlying granite; in German the word became Feldspat.

Orthoclase — Google Arts & Culture

The orthoclase of the alkali feldspar group is the name of an important group of minerals that probably make up 60% of the earth's crust. The feldspars crystallize from magma in both intrusive rocks and in those effusive; They are also present in many types of metamorphic rocks and sedimentary

Orthoclase - Healing Stones, Healing Crystals

ORTHOCLASE HEALING STONES. Useful in meditation. Orthoclase is a mineral that belongs to the family of silicate minerals called feldspar. The deference between the feldspars and the other silicates is that the former contain a mixture of the following chemical elements: Potassium K, Calcium Ca and Sodium Na, in addition to the usual constituents of the quartz based minerals, such as Aluminum ...

Orthoclase thin section - Tectosilicates - MicROCKScopic

Jan 12, 2020· Orthoclase – from Greek for straight and fracture, in reference to the cleavage angle, which is 90°. Feldspar (mineral group name), from Swedish names for field (feldt or falt) and spar (spat), in reference to the spar in tilled fields overlying granite; in German the word became Feldspat.

University of Minnesota's Mineral Pages: Potassium Feldspar

Orthoclase is the most common potassium feldspar, forming the majority of potassium feldspar found in felsic plutonic igneous rocks, some high temperature veins, and higher-grade metamorphic rocks. Sanidine has a less ordered crystal structure than orthoclase and is primarily found in volcanic igneous rocks where magmas cooled more rapidly and ... > *O* Crystals > Orthoclase

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Feldspar Distinctions, Characteristics & Identification

Aug 10, 2019· This mineral is often called potassium feldspar or K-feldspar because potassium always exceeds sodium in its formula. Potassium feldspar comes in three different crystal structures that depend on the temperature it formed at. Microcline is the stable form below about 400 C. Orthoclase and sanidine are stable above 500 C and 900 C, respectively.

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.

Orthoclase Mineral Physical-Optical Properties, Uses ...

An important rock-forming mineral, orthoclase is the potassium-bearing end member of the potassium sodium feldspar solid-solution series. It is a major component of granite its pink crystals give granite its typical color. Crystalline orthoclase can also be white, colorless, cream, pale yellow, or brownish red.

Feldspar - an overview | ScienceDirect Topics

Alkali feldspars have a range of chemical composition and the end members may be written as KAlSi 3 O 8 and NaAlSi 3 O 8. The K-feldspar polymorphs, sanidine, orthoclase, microcline, and adularia have identical chemical compositions. Sanidine is a monoclinic alkali feldspar with small optic axial angle (2V) and commonly occurs in volcanic rocks.

What Are The Uses Of Feldspar? - WorldAtlas

Aug 20, 2019· Alkali feldspars are divided into two groups: the first group is composed of minerals with potassium combined with silicon, sodium, and aluminum, such as orthoclase, sanidine, monoclinic, microcline, and anorthoclase, while the second group consists of minerals in which barium replaces potassium. These include celsian and hyalophane. Uses of ...

Orthoclase Gemstone Information - GemSelect

Oct 14, 2006· Orthoclase is a rare gemstone that belongs to the feldspar group, which also includes moonstone, amazonite, spectrolite and labradorite.Therefore, orthoclase is sometimes also called "K-spar". Orthoclase gemstones are typically champagne yellow, golden yellow or greenish, though they can be other colors.


in orthoclase) or antiperthites (microcline in plagioclase). Feldspars are quite abundant in igneous rocks. The presence or absence of individual feldspar species is an important factor in igneous rock classification. Feldspars are also important constituents of many metamorphic rocks and are found in some sedimentary rocks, especially sandstones.

Orthoclase Value, Price, and Jewelry Information ...

Orthoclase: Is a Variety of: Feldspar: Varieties: Adularia, Moonstone, Sanidine: Stone Sizes To large Heat Sensitivity Yes Identifying Characteristics Centipede inclusions Adularia Formula KAlSi3O8 (Note, this is the same formula as Microcline, but a different crystal system.) ...

Orthoclase Feldspar - Geology

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.. Orthoclase and the sodium-bearing end-member of the system, albite (sodium aluminosilicate; NaAlSi 3 O 8), …

Orthoclase: Mineral information, data and localities.

Although petrologists had used twinning as a method of distinguishing orthoclase from microcline, Wright and Stewart (1958) used the difference in certain d values to calculate a degree of disorder of a sample and thus have a quantitative method to identify the structural state of a potassium feldspar.

Orthoclase: The mineral Orthoclase information and pictures

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

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

Feldspar minerals have very similar structures, chemical compositions, and physical properties. Common feldspars include orthoclase (KAlSi 3 O 8), albite (NaAlSi 3 O 8), and anorthite (CaAl 2 Si 2 O 8). To appreciate the importance of feldspar as a rock-forming mineral, let's …

Orthoclase (Feldspar) - National Gem Lab

Orthoclase is a member of the Potassium Feldspars of the Feldspar Group of minerals that also includes Albite, Amazonite, Andesine, Anorthite, Bytownite, Hyalophane, Labradorite, Moonstone, Oligoclase, Orthoclase, Sanidine and Sunstone. Orthoclase was named for those in 1801 by Rene Just Haüy from the Greek word orthos meaning right in allusion to the cleavage angle.

K-feldspar (orthoclase, microcline ... -

K-feldspar (orthoclase, microcline, sanidine and related varieties) Occurrence. K-feldspar is widespread and common in a wide variety of igneous and metamorphic rocks and in some sedimentary rocks. Its chemistry and atomic arrangement are variable, so optical properties vary as well. The three principle varieties of K-feldspar are microcline ...


The feldspars are divided into 2 broad categories: plagioclase, which contains calcium and sodium; and orthoclase, which contains potassium. The plagioclase feldspars represent the "continuous branch" of Bowen's Reaction Series, and form a complete series between anorthite (the pure calcium member), and albite (the sodium-rich variety).

Orthoclase jewelry | Etsy

Zebradorite wire wrap necklace, orthoclase feldspar stone necklace, wire wrapped jewelry, zebradorite pendant, orthoclase feldspar pendant MoonchildrenBoutique. From shop MoonchildrenBoutique. 5 out of 5 stars (47) 47 reviews $ 38.00 FREE shipping Favorite Add to 30 grams Unakite (Orthoclase and Epidote) Gemstone MIneral Rock Chips ...