The element fluorine also derives its name from fluorite, a major source of the element. Co-Type Localities: ⓘ Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech …
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Hornblende is a group name used to describe Ferro-hornblende and Magnesio-hornblende, but the term is generally more inclusive for all calcium aluminum amphiboles. (Hornblende is frequently also used to describe any dark, opaque amphibole mineral without individual analysis.) The individual Hornblende minerals appear very similar …
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Clinozoisite is the same as Zoisite but crystallizes in the monoclinic system, which scientifically classifies it as an individual mineral species. Clinozoisite is also almost identical in composition to Epidote but lacks significant iron in its structure.It forms a series with Epidote, and in many cases the actual distinction between these two minerals …
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We strive for accurate content and locality information. If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. If you are requesting a locality be added, please only include significant locality occurences for the mineral.
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Pyrite was once used as a source of sulfur, but is now only a minor ore for both sulfur and iron. Pyrite from some localities is auriferous, and therefore is used as an ore of gold in gold-bearing localities.Pyrite was polished by the Native Americans in the early times and used as mirrors. Today, it is used as an ornamental stone, as well as a very popular …
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Sphalerite is a common mineral, and occurs in many distinct colors and forms. Iron impurities are often present in this mineral, and for this reason it is not commonly transparent. If Sphalerite contains a large amount of iron impurities, it will have a metallic dark gray or black color, which is typical of most sulfide minerals. Sphalerite is one of …
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Boulangerite typically forms in a unique crystal habit of fine acicular crystals that appear as woven, hair-like fibers. The thin fibers, which can be very thick covering an entire specimen, or thinly spaced on a matrix, are often bent or interwoven due to their flexibility.Boulangerite also forms as dense, hairy inclusions within other crystals, especially Calcite and Quartz.
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Large and exceptional delicate masses of Prehnite epimorphs after Laumontite come from the Kandivali Quarry, Mumbai, India. Several new deposits of gemmy Prehnite have been found in China, especially at Qiaojia, Yunnan Province; and at the Hongquizhen Quarry, Meigu, Sichuan Province. In Australia, good Prehnite has come from Prospect and …
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Ask the Chatbot a Question Ask the Chatbot a Question fluorite, common halide mineral, calcium fluoride (CaF 2), which is the principal fluorine mineral.It is usually quite pure, but as much as 20 …
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Fluorite primarily occurs as a pore-filling mineral in carbonate rocks (limestones and dolostones), as low temperature hydrothermal vein deposits associated with lead and silver ores, and less often as an …
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Galena is by far the greatest ore of lead. The extraction process to remove the lead from the sulfur is very simple, thus lead has been extracted from Galena since the earliest times. Galena from certain regions is rich in silver, and some specimens may contain as much as 20 percent silver. Because of this, silver-rich Galena is also an ore of silver. . Another …
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We strive for accurate content and locality information. If you feel any of the content is incorrect, or if you feel we are missing vital locality information, please fill out the form below so we can update the site. If you are requesting a locality be added, please only include significant locality occurences for the mineral.
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Fluorite is a favorite among collectors because of its vast range of colors, making it one of the most colorful minerals in the world. You can find fluorite in deep blue, vivid purple, sunny yellow, crystal …
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Staurolite is best known for its distinctive, cross-shaped penetration twins, where two rectangular crystals intersect each other to form a perfect cross. However, its most common twinning habit is in bisecting crystals with a 60° angle that can appear in the shape of an "x" when the crystals are elongated. Although Staurolite does form in single, non-twinned …
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Detailed description, properties, and locality information guide about the mineral fluorite. Minerals Complete Information Guide to Rocks, Minerals, & Gemstones
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The variation of iron in Pyrrhotite's structure is also responsible for more than one crystal symmetry type, allowing it to form in both hexagonal and monoclinic symmetries. Multiple crystal symmetries should technically classify Pyrrhotite as a mineral group rather than a single mineral, but a sub-classification is rarely made due to polytypes appearing similar …
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Fluorite, also known as fluorspar, is a widely occurring mineral found in various geological settings around the world. It is a colorful and highly valued mineral due to its vibrant fluorescence when exposed to ultraviolet light, which gives it its name. Fluorite has a fascinating range of physical properties and has numerous industrial, scientific, …
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Most Fluorite gemstones are from deeply colored stones, but they can also be cut from the less intense color forms. The most popular color for Fluorite is purple, and deep purple Fluorite can closely resemble Amethyst.Fluorite is often brightly fluorescent in ultraviolet light.In fact, the term fluorescence is derived from Fluorite. Due to the very low …
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Amethyst is a very common mineral and is found worldwide. Only a select few of the most famous localities will be mentioned here. Tall, prismatic, well-shaped crystals are restricted to several Mexican localities: Piedras Parado and Las Vigas de Ramirez, both in Veracruz; and Amatitlan, in Guerro.They occur in elongated crystals that are rarely faceted, since …
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Photos and information about 80 common rock-forming, ore and gemstone minerals from around the world. ... Minerals are materials that meet five requirements. They are: 1) naturally occurring, 2) inorganic, 3) solids, 4) with a definite chemical composition, and, 5) an ordered internal structure. ... Fluorite Fuchsite Galena Garnet Gaspeite Gold ...
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Localities where collection-worthy Gibbsite specimens have been found are very sporadic. The type locality where this mineral was first described is Richmond, Berkshire Co., Massachusetts. An outstanding, aesthetic green botryoidal form resembling Prehnite has been recently described in Xianghualing, Linwu, Hunan Province, China; and a one time …
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Lustrous, doubly terminated, and often stubby crystals come from the Mohawk Valley region of central New York, in an area covered by parts of Herkimer, Montgomery, and Fulton Counties.Quartz crystals from this region are affectionately known as Herkimer Diamonds, and are highly collectible and very popular with both novice and expert collectors. . …
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Thick widespread carbonate rock units of the Upper Mississippi River Valley once hosted large amounts of fluorite. These deposits formed as hydrothermal fluids moved along fractures in the carbonate rock, altering …
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Fluorite is a common mineral for collectors, whether it's just a few tumbled stones or large crystalline specimens that dominate a shelf. The wide range of colors, and ease of working, make it a long-lasting favorite for many of those who collect mineral specimens. There's more to this mineral than meets the eye, however, so let's dive in …
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The name Columbite has been discredited by the IMA, with the more specific designations of Columbite-(Fe) (also known as Ferrocolumbite), and Columbite-(Mn) (also known as Manganocolumbite) being used for this mineral's IMA-accepted nomenclature.Most Columbite specimens are of the Ferrocolumbite; Manganocolumbite is far less common. …
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Scheelite is an important ore mineral, and is well-known among collectors for its distinctly colored crystals associated with brilliant fluorescence.It forms a series with the rarer mineral Powellite, which contains molybdenum in place of the tungsten.Scheelite is named after the Swedish chemist Karl Wilhelm Scheele (1742-1786). Scheele is credited with …
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Among the most noteworthy sources of Elbaite is the state of Minas Gerais, Brazil, where outstanding forms and colors of this beautiful Tourmaline are found in numerous pegmatite localities. Specific famed locality names in Minas Gerais include Aracuai, Barra do Salinas, Conselheiro Pena, Golconda, Governador Valadares, Itambacuri, Ouro Preto, Sao Jose …
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Danburite is known for its distinct, well-formed, and often gemmy crystals. Danburite crystals are sometimes coated or entirely encrusted with drusy Quartz, and the Quartz may occasionally form a pseudomorph, completely replacing the Danburite.Danburite is named after the city of Danbury, Connecticut, where this mineral was first described.
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Rhodochrosite is a very aesthetic and desirable mineral; its deep red and hot pink crystals are highly sought after. Of special note are the beautiful, intensely colored rhombohedral crystals that have come from the Sweet Home Mine in Colorado. This mine provided a fascinating discovery in the 1960's of some of the largest and most stunning …
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Borax occurs in arid regions, forming from evaporation of saline lakes. Borax is also synthetically formed as a by-product of mining operations of borate deposits, and most of the specimens from the famous mine at Boron, California, are formed this way. The first Borax specimens came several dry lake deposits in Tibet. They were shipped in large …
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