gypsum fibrous crystals

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Gypsum gemstone information Gemdat

Gypsum is named from Greek "gypsos" plaster, alluding to its practical use. It has been known from antiquity. Gypsum is a very common mineral in sedimentary environments. It is found as massive material (Alabaster), clear crystals (Selenite) and parallel fibrous variety (Satin spar). Gypsum is very soft and very difficult to 

gypsum facts, information, pictures Encyclopedia articles

Gypsum occurs in a number of distinct forms, including a clear, parallelogramshaped crystal (selenite) a white, amorphous form (alabaster, used for ornamental carving) and a fibrous, lustrous form (satin spar, used in jewelry). When ground up and heated to drive off its water, gypsum becomes a powder termed plaster of 

gypsum deposits USGS Publiions Warehouse

A, Fibrous gypsum from a fissure in clay B, Specimen of selenite an inch thick, illustrating transparency and incipient cleavage.. 16. 1. ' HI. A, Aggregate of impure gypsum crystals from gypseous marl bed. B, Spongy gypsum formed as a secondary deposit. 18. IV. A, Massive gypsum showing mottled structure B, 

Gypsum and Halite

Gypsum is readily identified by its softness (a fingernail scratches it). Gypsum comes as clear crystals that display one perfect cleavage (selenite), as blocks of featureless white rock (alabaster), and as silky fibrous blocks (satin spar). Halite (next page) breaks into cubes (three cleavages at right angles) and tastes like table 

Gypsum, selenite: The mineral gypsum information and pictures

Curved Gypsum crystals and Gypsum Flowers exist in the Mammoth Caves of Kentucky, and large crystals of Selenite have come from Hanksville, Wayne Co., Utah. Curved fibrous masses come from Terlingua, Brewster Co., Texas and nice clear crystals are found in New York at Lockport, Niagara Co. and at Kerhonkson, 

Chemical Information Review Document for Synthetic and Naturally

Jan 10, 2006 Naturally Occurring Gypsum. Gypsum is formed as evaporites from marine waters. It occurs in various forms in nature—gypsite (an impure form in the earth), selenite (flattened and twinned crystals and transparent cleavable masses), alabaster (a translucent and fine grain), and satin spar (a silky and fibrous 

Petrography of gypsumbearing facies of the Semantic Scholar

of either nodules of gypsum or isolated lensoidal gypsum crystals that are parallel to bedding planes. (Figs. 6B,C). The nodules are up to 5 mm long, and internally composed by a dark mixture of anhydrite and gypsum that form a massive cryptocrystalline framework. FIBROUS TO ACICULAR GYPSUM. This type of gypsum 

Gypsum Earth Sciences Museum University of Waterloo

Gypsum can be found as thick layers in shale and as attractive crystals. Rock Gypsum soft, granular, white to gray, with 3040% impurities Selenite pure crystalline gypsum found in transparent monoclinic crystals Alabaster white, compact, fine grained variety used for carving Satin Spar fine, translucent fibrous variety 

Gypsum Wikipedia

Gypsum occurs in nature as flattened and often twinned crystals, and transparent, cleavable masses called selenite. Selenite contains no significant selenium rather, both substances were named for the ancient Greek word for the Moon. Selenite may also occur in a silky, fibrous form, 

gypsum Raven Crystals

Nov 11, 2016 SCIENTIFIC: Gypsum occurs in evaporating sea beds. Gypsum has a low solubility so it becomes one of the first minerals to separate and be deposited when the ocean brine evaporates. Gypsum crystallizes in a variety of forms: granular masses, fibrous shapes, and crystals that have prismatic, needlelike, 

gypsum Raven Crystals

Nov 11, 2016 SCIENTIFIC: Gypsum occurs in evaporating sea beds. Gypsum has a low solubility so it becomes one of the first minerals to separate and be deposited when the ocean brine evaporates. Gypsum crystallizes in a variety of forms: granular masses, fibrous shapes, and crystals that have prismatic, needlelike, 

Anhydrite and Gypsum

cleavage surfaces, and its crystals display a variety of forms, the most common being a granular, massive rock known as alabaster. Another type, selenite, is a transparent crystalline material that forms large, welldeveloped crystals. Aggregates of fibrous gypsum form a variety called satin spar. Although associated with 

Gypsum in modern Kamchatka volcanic hot springs and the Lower

Oct 1, 2014 In sediments of the Kamchatka hot springs, we observed prismatic, prismatic pseudohexagonal, fibrous, tubular, lenticular and twinned gypsum crystals, with crystal sizes ranging from <200 nm to >200 μm. The coexistence of diverse crystal habits of gypsum implies a constant interaction between hot 

Gypsum and Halite

Gypsum is readily identified by its softness (a fingernail scratches it). Gypsum comes as clear crystals that display one perfect cleavage (selenite), as blocks of featureless white rock (alabaster), and as silky fibrous blocks (satin spar). Halite (next page) breaks into cubes (three cleavages at right angles) and tastes like table 

Gypsum, selenite: The mineral gypsum information and pictures

Curved Gypsum crystals and Gypsum Flowers exist in the Mammoth Caves of Kentucky, and large crystals of Selenite have come from Hanksville, Wayne Co., Utah. Curved fibrous masses come from Terlingua, Brewster Co., Texas and nice clear crystals are found in New York at Lockport, Niagara Co. and at Kerhonkson, 

Fibrous gypsum and fibrous anhydrite in veins Wiley Online Library

polycrystalline forms, some of which are fibrous. The best known fibrous form is satinspar which consists of aggregates of fibrous gypsum crystals with a distinctive lustre and typical optical characteristics (Raman &. Ramdas, 1954). Satinspar occurs typically in exten sional veins up to several centimetres thick both in.

Fibrous gypsum and fibrous anhydrite in veins Wiley Online Library

polycrystalline forms, some of which are fibrous. The best known fibrous form is satinspar which consists of aggregates of fibrous gypsum crystals with a distinctive lustre and typical optical characteristics (Raman &. Ramdas, 1954). Satinspar occurs typically in exten sional veins up to several centimetres thick both in.

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