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Finish Smooth, unperforated satin finish Mass kg/m2 Product performance Acoustic performance D ncw ... Product Data Sheet ... For a comprehensive and uptodate library of information visit the British Gypsum website at: For information about products supplied by Artex Limited or SaintGobain Isover please see their ...
Gypsum has several variety names that are widely used. Selenite is the colourless and transparent variety that shows a pearl like luster and has been described as having a moon like glow. The word selenite comes from the greek for Moon and means moon rock. Another variety is a compact fibrous aggregate called Satin Spar. This variety has a very ...
British Gypsum Satin Spar (Wipeable) 600 x 600mm Square Edge Ceiling Tiles (10/Box) ... These products often have no performance data associated, especially crucial in terms of ''Reaction to Fire''. Our advice would be, if the price seems too good to be true, there is probably a reason for this. ...
Gypsum is a common hydrated calcium sulphate mineral. Varieties of Gypsum include Satin Spar (fibrous), Selenite (clear crystalline), Alabaster (fine grained) and Desert Rose (brown sand inclusions). Gypsum crystals can form interesting wavy formations. Polished Satin Spar (often incorrectly named Selenite) displays chatoyancy (cat''s eye effect).
Chemical Information Review Document for Synthetic and Naturally Mined Gypsum (Calcium Sulfate Dihydrate) [CAS No. ] ... alabaster (a translucent and fine grain), and satin spar (a silky and fibrous transparent crystal form)—and in various purities. ... Human Data Gypsum is a skin, eye, mucous membrane, and respiratory system irritant.
Selenite, also known as satin spar, desert rose, or gypsum flower are four crystal structure varieties of the mineral four varieties of gypsum may be grouped together and called selenite. All varieties of gypsum, including selenite and alabaster, are composed of calcium sulfate dihydrate (meaning that it has two molecules of water), with the chemical formula CaSO 4 ·2H 2 O ...
A fibrous variety of Gypsum or Calcite and Aragonite. The name originally referred to a variety of Calcite found in "Cumberland, England", but the name was eventually used to cover varieties of Aragonite and Gypsum too, so this name is best used as an adjective in conjunction with a mineral name rather than as a specific variety name of its own see Satin Spar Gypsum and Satin Spar Calcite.
Gypsum, common sulfate mineral of great commercial importance, composed of hydrated calcium sulfate (CaSO 4 ·2H 2 O). In welldeveloped crystals the mineral commonly has been called selenite. The fibrous massive variety has a silky lustre and is called satin spar; it is translucent and opalescent and is valued for ornaments and jewelry.
In modern usage Satin Spar is a compact fibrous variety of Gypsum. It is generally white, silky and translucent with pearly or milky appearance. Satin Spar can be cut into very striking chatoyant cabochons. Historically, the name Satin Spar was first applied to a variety of calcite see Calcite Satin Spar.
Calcite Satin Spar was the first material to be called Satin Spar, a name now associated with a similar variety of gypsum. Calcite Satin Spar is a hard fibrous form of calcite which can take an excellent polish to give a fine satiny finish. It was first found in the last years of the 18th century near Alston in Cumbria, England.
Satin spar gypsum has crystals resembling silky threads closely packed together, splits parallel to the fibers, and is found as fillings in cracks within rocks and as thin layers in shales. Massive microcrystalline gypsum is granular. Gypsum deposits occur deep underground in Illinois, .
Varieties: There are four crystalline varieties of gypsum, which are satin spar, desert rose, gypsum flower, and selenite, all of which can sometimes be grouped together forming selenite. Mineral Group: Gypsum is part of the sulfate group, which is a group of minerals that consist one or more metallic elements and the sulfate ion (SO 4 2). All ...
Interesting Gypsum Facts: The word gypsum is derived from the Greek word gypsos which means chalk or plaster. Gypsum has five basic forms: selenite, satin spar, alabaster, rock gypsum, and gypsite. The most common form of gypsum is rock gypsum. There is a large sand dune in New Mexico made of gypsum .
Varieties: There are four crystalline varieties of gypsum, which are satin spar, desert rose, gypsum flower, and selenite, all of which can sometimes be grouped together forming selenite. Mineral Group: Gypsum is part of the sulfate group, which is a group of minerals that consist one or more metallic elements and the sulfate ion (SO 4 2). All ...
Satin Spar Gypsum: A fibrous variety of Gypsum. See also the main page on Satin Spar. Selenite: The name ''selenite'' is mostly synonymous with gypsum but has been used historically to describe the transparent variety, as opposed to satin spar gypsum for the fibrous variety and alabaster for the finegrained massive form.
Numerous localities worldwide. Naica, Chihuua, Mexico. Link to Location Data. Name Origin: From the Greek, gyps meaning "burned" mineral. Selenite from the Greek in allusion to its pearly luster (moon light) on cleavage fragments. Name Pronunciation: Gypsum : Synonym: Alabaster : ICSD 2057 : PDF 33311 : Satin Spar : Selenite ...
★ Satin spar, which is a variety of gypsum, is sometimes used as an ornamental stone, while alabaster is used primarily for sculpting. ★ Gypsum is used to give color to cosmetics and drugs. It has been permitted to be used as a food additive by the Food and Drug Administration (FDA) of the United States.
Mar 19, 2018· Selenite is a sulfate mineral. It is a form of gypsum, which is mined and applied for various applications such as fertilizer. When gypsum is formed into clear and colorless crystals, it is called as selenite. However, if it forms with a more fibrous texture and is opaque, than it is called as satin spar.
Mineral Resource Data System (MRDS) Satin Spar Gypsum Mine. Past Producer in Pershing county in Nevada, United States with commodity GypsumAnhydrite. Map. XML. JSON. KML. Geologic information. Identification information. Deposit ID: : MRDS ID: M060423: MAS/MILS ID: : Record type: Site: Current site name: Satin Spar Gypsum ...
Satin Spar. This massive, fibrous variety of gypsum can be carved or cabbed. Brown satin spar can make lovely decorative items. Some satin spar cabochons may show very pronounced chatoyancy or a "cat''s eye" effect. The noted mineralogist and folklorist George F. Kunz wrote that eggshaped satin spar cabs from Egypt were sometimes called "Pharaoh''s Eggs" and were purported to be ...
Gypsum Uses. A soft mineral, gypsum occurs in nature in a crystal form and found in large masses called selenite or satin spar. Deposits are found in shale beds and are formed as a byproduct of sulfide oxidation. The mineral is mined all over the world with large domestic deposits found in New York, Michigan, Indiana, Texas and California.
It is porous and is therefore easily dyed. The fibrous Satin Spar variety is sometimes cut into cabochons for collectors because of its strong cat''s eye effect. Fine Gypsum specimens are very popular among mineral collectors, especially the varieties Selenite and Desert Rose.
Gypsum is found as twinned monoclinic crystals, called selenite, or silky fibrous crystals, called satin spar. Massive blocks of finegrain white, translucent gypsum are called alabaster and have been used since ancient times for carved ornamental objects and statuary.
Gypsum: Gypsum mineral information and data. Gypsum Sterling Mine, Visit gemdat for gemological information about Gypsum. Pseudomorphs of Gypsum after an unidentified mineral. ... Gypsum: Satin spar, a fibrous variety of gypsum from Derbyshire, England. Minerals: Information about ore minerals, gem materials and rockforming minerals.
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