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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 ...
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. ...
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.
Gypsum also occurs in crystal form, with the two most common varieties being large clear crystals that are often termed selenite, and fibrous crystals, known as satin spar. 'Selenite' is the Greek word for moon, and refers to the crystals well-developed pearl-like luster that can reflect a soft moon-like glow.
Gyprex SATINSPAR has a high level of light reflectance and resistance to staining with an attractive smooth satin finish. The gypsum core is recyclable. ... Further Information & Resources. Gyprex SATINSPAR Product Data Sheet. pdf. 128.8 KB. Download. Gyprex SATINSPAR Declaration of Performance. pdf.
★ 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.
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 rock-forming minerals.
Chemical Information Review Document for Synthetic and Naturally Mined Gypsum (Calcium Sulfate Dihydrate) [CAS No. 13397-24-5] ... 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.
It is porous and is therefore easily dyed. The fibrous Satin Spar variety is sometimes cut into cabochons for collectors because of its strong 's eye effect. Fine Gypsum specimens are very popular among mineral collectors, especially the varieties Selenite and Desert Rose.
Gypsum, common sulfate mineral of great commercial importance, composed of hydrated calcium sulfate (CaSO 4 ·2H 2 O). In well-developed 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.
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.
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 fine-grained massive form.
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 .
Mineral Resource Data System (MRDS) Satin Spar Gypsum Mine. Past Producer in Pershing county in Nevada, United States with commodity Gypsum-Anhydrite. Map. XML. JSON. KML. Geologic information. Identification information. Deposit ID: 10296024: MRDS ID: M060423: MAS/MILS ID: 0320270367: Record type: Site: Current site name: Satin Spar Gypsum ...
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 ('s eye effect).
A variety of Calcite The original name Satin Spar referred to a variety of Calcite. Currently 'Satin Spar' is often used to refer to a variety of Gypsum (See Satin Spar Gypsum, so to avoid confusion the original Calcite variety material is listed on this website as Satin Spar Calcite. Visit gemdat for gemological information about Calcite Satin Spar.
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.
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 "'s eye" effect. The noted mineralogist and folklorist George F. Kunz wrote that egg-shaped satin spar cabs from Egypt were sometimes called "Pharaoh's Eggs" and were purported to be ...
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, .
Gypsum occurs in extensive beds associated with other evaporite minerals (e.g., anhydrite and halite), particularly in Permian and Triassic sedimentary formations; it is deposited from ocean brine, followed by anhydrite and halite.It also occurs in considerable quantity in saline lakes and salt pans and is an important constituent of cap rock, an anhydrite-gypsum rock forming a covering on ...
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 ...
Selenite, also known as satin spar, desert rose, or gypsum flower are four crystal structure varieties of the mineral gypsum.These 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 ...
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.
Gypsum (CaSO 4 *2H 2 O) is a soft, water soluble mineral that is processed to make critical building materials especially wallboard. Gypsum is mostly massive (Fig. 1A) but also forms silky satin spar (Fig. 1B). It is sometimes mixed with the related mineral, anhydrite (Fig. 1C).
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