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Gemstones: Facts, photos, and information for over 100 gems.

100+ Gems - Photos of over 100 beautiful gems ranging from the popular to the obscure. All About Diamonds Diamond A collection of photos, articles, facts, maps and graphs about diamonds.

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Interesting Moonstone Facts, History, and Meaning

101 Productions Ltd/Getty Images. Adularescence is the optical phenomenon that causes the extraordinary glow on the surface of moonstone. The light moves across the stone much like moonlight would glide across a large body of calm water. This happens when light reflects off of the thin layers of different feldspar minerals within moonstone.

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Feldspar Distinctions, Characteristics & Identification

Feldspars are hard minerals, all of them with a hardness of 6 on the Mohs scale. This lies between the hardness of a steel knife (5.5) and the hardness of quartz (7). In fact, feldspar is the standard for hardness 6 in the Mohs scale. Feldspars usually are white or nearly white, though they may be clear or light shades of orange or buff.

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Porphyry - Igneous Rocks

Porphyry is an igneous rock that contains larger crystals (phenocrysts) in a fine-grained groundmass. K-feldspar phenocrysts in this sample. Width of view 7 cm. TUG 1608-2807. It seems simple enough but unfortunately there are many different interpretations. Sometimes it is assumed that porphyry is granitic in composition 1 while other sources ...

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Fast Facts about the Colors of Your Granite Countertops

For example, granite with large quantities of potassium feldspar will look pink, while large quantities of amphiboles make it look green. Quartz and feldspar are the predominant minerals in granite, comprising between 20% and 60%, and 10% to 65%, respectively. Other minerals are biotite or muscovite (between 5% and 15%), and amphiboles.

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Feldspar Photos and Premium High Res Pictures - Getty Images

Find the perfect Feldspar stock photos and editorial news pictures from Getty Images. Select from premium Feldspar of the highest quality.

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K-Feldspar: Mineral information, data and localities.

K-Feldspar mineral data, information about K-Feldspar, its properties and worldwide locations. ... Photo Search Photo Galleries Search by Color New Photos Today New Photos Yesterday Members' Photo Galleries Past Photo of the Day Gallery Mineral Photography. K-Feldspar. This page is currently not sponsored. Click here to sponsor this page.

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Interesting facts about quartz | Just Fun Facts

Interesting facts about quartz. Quartz is a widely distributed mineral. It is composed of silicon and oxygen atoms. Quartz is the 2nd most abundant and widely distributed mineral found at Earth 's surface, behind feldspar. It is present and plentiful in all parts of the world; and found is all forms of rock: igneous, metamorphic and sedimentary.

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Labradorite: The feldspar mineral Labradorite information ...

Labradorite is an unusual mineral. It can display a beautiful iridescent play of colors, caused by internal fractures in the mineral that reflect light back and forth, dispersing it into different colors. This effect, known as labradorescence, gives Labradorite its appeal and fame.Specimens sold to collectors are usually polished or sliced by dealers to fully bring out this effect.

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Albite Mineral Information photos and Facts, tungsten ore

Albite Mineral Facts:. Chemical Formula: NaAlSi 3 O 8 The Sodium-aluminum silicate, Silica 68.7%, alumina 19.5%, soda 11.8%. Calcium is usually present in a small amount in the form of the anorthite molecule.. Colors: Colorless, white, gray. Sometimes with a bluish, greyish, reddish, or greenish tinge, The streak nearly colorless or white.

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sodium feldspar | Encyclopedia.com

sodium feldspar See ALKALI FELDSPAR. Source for information on sodium feldspar: A Dictionary of Earth Sciences dictionary.

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27 Types of Igneous Rock [with detailed photos] – Outside ...

This is a phaneritic textured igneous, intrusive rock. It has quite a few similarities to granite. However, it has a higher concentration of plagioclase feldspar when compared to orthoclase feldspar. It is most commonly found in volcanic arcs and also in mountain buildings. It is known to emplace as large sized batholiths in mountain roots.

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Feldspar Statistics and Information - USGS

Feldspars are aluminosilicates containing varying amounts of calcium, potassium, or sodium. In glassmaking, feldspar provides alumina for improving hardness, durability, and resistance to chemical corrosion. In ceramics, feldspar is used as a flux, lowering the vitrifying temperature of a ceramic body during firing and forming a glassy phase.

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Rhyolite Rock | Properties, Composition, Formation, Uses

Rhyolite; Rhyolite is felsic igneous extrusive rock and it is a fine-grained and dominated by quartz (>20%) and alkali feldspar (>35%).Due to the high silica content, rhyolite lava is very viscous.It is often difficult to identify rhyolites without chemical analysis due to their glassy groundmasses. Many rhyolites consist mainly of glass, and are termed obsidian, or are partially devitrified ...

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Gem & Mineral Identification | Treasure Quest Mining

Amazonite – Also called Amazon Stone, this blue-green feldspar variety of microcline is named after the Amazon river and is frequently mined in Brazil. It is a semi-precious gemstone. Amethyst – Known for its regal purple color, this member of the quartz family has long been cherished as a gemstone and frequently worn in jewelry. In Greek ...

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Feldspar gemstone information

Feldspar is derived from German "Feld"- field and "Spath" - a rock that does not contain ore. There are two main subgroups that produce gems: the potassium feldspars and the plagioclases (a series from calcium to sodium feldspars).

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Arkose - Sedimentary Rocks

Arkose is a feldspar-rich sandstone. It is commonly coarse-grained and usually either pink or gray (depending on the color of feldspar). Arkose is a type of sandstone that contains lots of feldspar grains. A sample from the precambrian of Finland found on the northwestern coast of Estonia where it was left by the receding Scandinavian ...

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Sunstone gemstone information

Sunstone is a plagioclase feldspar that has red, more rarely green or blue glitter which is caused by light reflections from tiny hematite or goethite platelets. The name derives from sunstones believed to have been used for navigation in the Middle Ages. Sunstone is …

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orthoclase | mineral | Britannica

orthoclase, common alkali feldspar mineral, a potassium aluminosilicate (KAlSi 3 O 8); it usually occurs as variously coloured, frequently twinned crystals in granite.Orthoclase is used in the manufacture of glass and ceramics; occasionally, transparent crystals are cut as gems. Orthoclase is primarily important as a rock-forming mineral, however, and is abundant in alkali and acidic igneous ...

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Amazonite - Facts, Lore, History, Myths and Pictures

Amazonite Facts, Information and Description: 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. Schiller is a lustrous reflection from planes in a mineral grain and is similar to what is …

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Orthoclase Mineral Information photos and Facts, gems

Orthoclase Mineral Facts: A Potash Feldspar or K-spar. Potassium-aluminium silicate, with Silica 64.7%, alumina 18.4%, potassium 16.9%. Sodium sometimes replaces a portion of the potash. Colors: white, gray, flesh-red, more rarely green. The streak of orthoclase is white. Hardness: 6 to 6.5.

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What Is Moonstone Gemstone | Moonstone Stone – GIA

Moonstone is a variety of the feldspar-group mineral orthoclase. During formation, orthoclase and albite separate into alternating layers. When light falls between these thin layers it is scattered producing the phenomenon called adularescence. Adularescence is the light that appears to billow across a gem. Other feldspar minerals can also show ...

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Mineral Properties, Photos, Uses and Descriptions

Copper is a metal used in coins, electronics, pipes, wiring, motors, alloys and many other products. Uses of Talc. Talc is a soft mineral used in cosmetics, paper, paint, ceramics and many other products. Magnesite. Magnesite is a carbonate mineral used for chemicals, fire …

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Selenite or Satin Spar? - The Citrine Circle

Selenite is the most famous of the two names, but Selenite crystals are actually much rarer than Satin Spar. Selenite forms in large flat, transparent crystals that are often called "plates" or "windows". They have very thin sheets and can flake apart. …

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feldspar | Properties, Uses, Types, & Facts | Britannica

feldspar. See all media. See all facts and data →. feldspar, any of a group of aluminosilicate minerals that contain calcium, sodium, or potassium. Feldspars make up more than half of Earth's crust, and professional literature about them constitutes a large percentage of the literature of mineralogy. Of the more than 3,000 known mineral ...

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Feldspar Group: Mineral information, data and localities.

Feldspar is the name of a group of aluminium silicate minerals and is collectively the most common mineral group found on the surface of the Earth. The major ...

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NC Mineral Resources - An Overview | NC DEQ

Feldspar is used both in the body of the ware and the glaze of ceramics. Mica - Mica mining began on a large scale in western North Carolina about 1868. The area has become the most important producer of mica in the U.S. Sheet mica was the principal product for many years, but other materials have eliminated many of the uses for sheet mica.

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Feldspar Stock Photos and Images. 748 Feldspar pictures ...

Picture by Morphart 1 / 15 A forest with big rocks Stock Photos by colematt 3 / 118 Red granite texture with feldspar, quartz, and mica Stock Photography by jojoo64 0 / 0 raw pink Tourmaline in feldspar on white marble Stock Image by vvoennyy 0 / 0 Feldspar, closeup of the mineral cut out on a white background Stock Photography by Jochen 0 / 0 ...

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Feldspar Photos and Premium High Res Pictures - Getty Images

Browse 219 feldspar stock photos and images available or search for bentonite or bitumen to find more great stock photos and pictures. minerals and their crystalline forms - feldspar stock illustrations. semi-precious gems - feldspar stock pictures, royalty-free photos & images. a woman in platja cap roig- sant antoni de calonge-costa brava ...

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Spectrolite (Labradorite) - Facts, Lore, History, Myths ...

Facts, Information and Description. Spectrolite, the most valued type of labradorite, comes from Finland. The name is derived from Labrador which is the main and original source of the Canadian variety of this feldspar stone. Labradorite is also found in India, Madagascar, Newfoundland, and Russia. A type of translucent feldspar which displays ...

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