Feldspar
Feldspar is the versatile mineral found in the earth's crust in more quantities than any other mineral. The usage of this mineral is extensive and wide and only recently it is being used as a gemstone.
Feldspar
Chemical composition -- A family of complex aluminosilicates that are the most common minerals in the Earth's crust.
Color -- a wide range of colors.
Feldspar
Chem:
KAlSi3O8 - Orthoclase
KAlSi3O8 - Microcline
NaAlSi3O8- CaAl2Si2O8 - Plagioclase ...
Feldspar
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FELDSPAR
Overview: The name "feldspar" comes from "field stone", because when feldspar weathers, it releases large amounts of plant nutrients, such as potassium, which enrich the soil.
The feldspar group has nine species; there are varieties within some of the species, and there are also intergrowth of species resulting from the unmixing of solid solutions. All of these species, varieties, and intergrowths can be gemstones.
The name feldspar comes from the German feldt spat, meaning “field stone,' because when feldspar weathers, it releases plant nutrients, such as potassium, which enrich soil.
Just the facts ...
The Naming of Feldspar Gems
The naming of feldspar gems, including moonstone, labradorite, and amazonite gem stones, sometimes incorrectly named a jade ...
The feldspars are a group of related minerals which, as a group are the most abundant minerals in the earth's crust. However, only a tiny percentage of the feldspars fall in the "gem quality" range.
Sunstone is a variety of Labradorite feldspar that generally shows an opaque "schiller" effect where the metallic inclusions reflect light in a blaze of color. However, it can also come in clear stones which are suitable for faceting.
Feldspar is a ubiquitous mineral that, usually in the form of small grains, makes up 50-60% of the content of the rocks of the Earth's crust.
Feldspar
A large group of minerals that is found in a wide area of the earth, but only a few of its members are suitable for gemstones.
Feldspars are divided into several series: ...
Feldspar: A family of minerals which are all silicates of alumina with either potash, soda, or lime.
FELDSPAR
Feldspars are a family of minerals that include moonstone (adularia), amazonite, sunstone, and labradorite.
FETISH ...
Feldspar
Group of rock forming minerals that are important in the formation of many rocks. All feldspars are types of aluminium silicate, with potassium, calcium, sodium or barium. Varieties include sunstone, moonstone, labradorite and amazonite.
feldspar Number six on the Mohs hardness scale. A group of crystalline structures that are all aluminum silicates with at least one other mineral included such as potassium, sodium, calcium or barium.
About Feldspar
Feldspar is the commonest mineral in the Earth's crust, but identifying it can be tricky.
Gallery of Feldspars
Get to know this family of common minerals.
Feldspar is the name given to a group of common rock-forming Minerals. Feldspars occur as compact Minerals, as veins, and are present in many types of metamorphic and sedimentary rock. Moonstone is a Feldspar.
Fire ...
Feldspar takes a number of forms (moonstone is one) In general, it helps one to detach from old ways of doing things, thus permitting creativity to flower. It also assists in self-awareness and self-love.
Feldspar - in a cuttable grade that could be called moonstone.
Gahnite - as crystalline specimens were reported by D.O.T personnel during the blasting, though positive identification has not been made to date.
Feldspar is a very large mineral group that plays an important role in the formation of rocks. Andesine, labradorite, moonstone, and sunstone are examples of gemstones that belong to this group.
Figaro-link chain ...
Feldspar: A family of minerals that includes amazonite, moonstone and sunstone.
Ferrer's Emerald: An imitation emerald made of glass.
Festoon: A necklace usually short in length that has dangles.
A feldspar named after the blue-white sheen inherent, which can also produce moonstone cats' eye. 6-6 1/2 on the hardness scale. Cut in cabochon, always.
Mother's Ring: ...
The feldspar crystals have a propensity for multiple and complex twinning and is probably the orthoclase member of this silicate mineral group.
Aventurine Feldspar is also called Sunstone. This gemstone varies from golden to orange to red-brown, and can be transparent or translucent.
aventurine feldspar
Aventurine feldspar is also called Sunstone (a variety of oligoclase). This gemstone varies from golden to orange to red-brown, and can be transparent or translucent.
Plagioclase Feldspar Group
The Plagioclase series is a group of related feldspar minerals that basically have the same formula but vary in their percentage of sodium and calcium.
A variety of feldspar known as the rainbow moonstone is also found in India and Madagascar. In a rainbow moonstone, the adularescent sheen ranges from pink to purple to blue to peach to yellow. A single rainbow moonstone may exhibit all these colours.
Aventurine Feldspar: See Sunstone.
Aventurine Glass: A shimmering glass containing tiny copper flakes invented in Venice, Italy, around 1700.
Titanite with feldspar and epidote (6.3 x x 2.2 x 1.9 cm), from Capelinha, Minas Gerais Province, Brazil. This specimen, from the Martin Zinn Collection, features twin crystals with great luster. Price: $3,200. (Photo: John McLean) ...
Orthoclase (aka feldspar) in an igneous rock forming tectosilicate (silicate) mineral and is a key component in granite.
An opaque form of feldspar
Amber
The fossilized resin of prehistoric pine trees which ranges in color from golden to orange-red ...
See Feldspar
Aegirine ... See Acmite
African Jade ... Massive green Grossular Garnet Agalmatolite ... See Pyrophyllite, Pinite, Talc Agate ... See quartz .. Chalcedony .. Banded Quartz
Agatized Wood...
Amazonite:An iridescent light to blue green variety of feldspar, often mottled or striated, and named for the Amazon River (although it isn't found there).
early twentieth century A Jour Open setting that leaves the pavilion facets open to the light Alloy A mixture of two or more metals Aluminum A silver white metal that is lightweight and malleable Amazonite An opaque form of feldspar ...
A form of feldspar that displays brilliant and colorful shimmers and flashes of light when viewed in the right direction. First discovered in Labrador, Canada. Can be light grey or nearly black.
Amazonite A green or blue-green member of the Feldspar clan. Inspires truth, sincerity, honor, self-love, communication, eloquence, integrity, trust, clairvoyance, clarity, prophecy and openness.
This brilliantly iridescent material is regarded as the world's most beautiful form of labradorite (a variety of plagioclase feldspar). Specifically, "spectrolite" is a trade name for high-grade labradorite found only in Finland.
These include quartz (SiO2), the minerals of the feldspar group (orthoclase, K(AlSi3O8), albite Na(AlSi3O8), and anorthite (Ca(Al2Si2O8)) and muscovite mica (KAl2(AlSi3O10)(OH)2).
Moonstone belongs to the large mineral family of feldspars. It is an opalescent stone which can range from colorless to blue, peach, green, pink, yellow, brown or gray with a silvery scheen.
Schiller - An irridescent luster, as in some feldspars (Labradorite)
Schistose - Thinly layered, as in schist rocks.
Sectile - Capable of being cut with a knife (Acanthite) ...
Basic igneous rocks (BIR) include basalts, dolerites, gabbros, kimberlites, and peridotites, and abundant minerals in such rocks include olivine, pyroxenes, Ca-feldspar (plagioclase), amphiboles, and biotite.
Adularescence is caused by the layer effect due to presence of tiny inclusions of another feldspar in the host material.
Moonstone is a member of the large feldspar family of minerals which includes about two-thirds of all stones on earth. It has a hardness of 6-6.
Labradorite (a variety of plagioclase feldspar) is a fairly abundant grayish mineral that has brilliant flashes of color (usually green, blue or red) after it is polished (called labradorescence). The crystals are transparent to translucent.
Moonstone is the best known gem variety of orthoclase feldspar, being potassium aluminium silicate. It is usually polished as a cabochon, and is often carved with a moon face.
Quartz is silicon dioxide, SiO2, the second most common mineral in the crust of the earth (less common than feldspar).
Amazonite is a gem variety of microcline feldspar and is usually polished as a cabochon. It displays a schiller of light which is caused by inclusions.
Variety of Quartz or Feldspar Mineral that is flecked with particles of hematite and mica that cause a shiny iridescence
Color: Green, orange, brown, yellow, blue, or gray
Transparency: Translucent to opaque
Hardness: 6.5 ...
The stone belongs to the plagioclase feldspar group, which is a series of mixtures of sodium and calcium aluminum silicates. It was discovered in 1940 during World War II by accident.
Labradorite is a smoky gray stone that is plagioclase feldspar. It is found in the U.S, Canada, Mexico, Ukraine, and Australia. A metallic rainbow reflection is seen from different angles.
Moonstone (orthoclase) is a semi-translucent stone that is made of albite and orthoclase feldspar. It is usually whitish-blue, but can be colorless, yellow, orange, gray, or even reddish. Moonstone is usually set as a cabochon.
This enchanting gemstone belongs to the large mineral group of the feldspars, of which almost two thirds of all the rocks on Earth consist.
Labradorite A variety of feldspar which has a varied display of colors suggestive of the northern lights. Although it has a dirty grey colour in the rough, cut stones aquire a metallic lustre and a beautiful sheen at the right angle.
Another related feldspar variety is known as rainbow moonstone. In this variety of labradorite feldspar, the sheen is a variety of rainbow hues.
Fine moonstone is quite rare and becoming rarer. It is mined in Sri Lanka and Southen India.
Amazonite is a gem variety of microcline feldspar. It displays a schiller of light which is caused by . Amazonite varies from bright verdigris green to a bluish green and is mined in the United States, Brazil, Zimbabwe, Russia, Australia and Namibia.
Howlite Earrings with Gray Feldspar
by RoughMagicCreations
Feldspar
A group of common rock-forming minerals that have a vitreous lustre, and are usually white or nearly white, flesh-red, bluish, or greenish in colour.
Moonstone is the most valuable variety of feldspar with an iridescent sheen known as adularescence. Moonstone's characteristic shimmer is caused by the intergrowth of two different types of feldspar with different refractive indexes.
A variety of feldspar. Exhibits flashing. Helps balance systems of the body. Stabilizes emotional states, helps to release stress and tension. Stone of the Goddess, aid to travelers. Creates joy and peace in our homes.
The colored stripes are microcline and the white or clear stripes are feldspars. If there is more feldspar than microcline it is called antiperthite. Found in the U.S.A.,Brazil, India, China, Namibia, and Russia.
 See also: Stone, Mineral, Color, Crystal, Gemstone
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