gypsum fibrous crystals

Another variety is a compact fibrous aggregate called satin spar . This variety has a very satin like look that gives a play of light up and down the fibrous crystals. A fine grained massive material is called alabaster and is an ornamental stone used in fine carvings for centuries, even eons. Gypsum is a very common mineral in sedimentary environments. It is found as massive material, clear crystals and parallel fibrous variety . Gypsum is very soft and very difficult to facet because of its perfect cleavage, therefore faceted stones are quite rare.

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Gypsum Mineral Data

Fibrous - Thin, elongated fractures produced by crystal forms or intersecting cleavages (e.g. asbestos). Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals. Habit: Massive - Fibrous - Distinctly fibrous fine-grained forms. Habit: Tabular - Form dimensions are thin in one direction. Hardness: 2 - Gypsum : Luminescence:

One of the most celebrated occurrences, the "Cave of the Crystals" in Naica, Chihuahua, Mexico contains gigantic selenite crystals. The largest found so far measures 39' x 13' and weighs 55 tons. Giant gypsum (selenite) crystals in the "Cave of the Crystals" in Naica, Chihuahua, Mexico. Note the person for scale.

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, with the chemical formula CaSO42H2O. Selenite contains no significant selenium, the similarity of the names

28.11.2019Crystals of gypsum, when occurring in clay, may enclose much muddy matter; in other cases a large proportion of sand may be mechanically entangled in the crystals without serious disturbance of form; whilst certain crystals occasionally enclose cavities with liquid and an air-bubble. Gypsum not infrequently becomes fibrous. This variety occurs in veins, often running through

Sep 20, 2011Measuring Gypsum Normal Growth Rates at Different Temperatures. The proposed mechanism for the formation of Naica megacrystals implies that the driving force for crystallization had to remain relatively constant over time: If supersaturation increased significantly many more crystals would have nucleated and if supersaturation dropped significantly then growth would have simply stopped.

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A striking, purple variety of quartz which is best known for occurring in large, crystal encrusted geodes mined in Brazil and Uruguay. While quartz itself is clear, amethyst gets its purple color from naturally irradiated iron inclusions within the quartz crystals.The more low level irradiation it has been exposed to (over millions of years) the darker the color.

ROCK GYPSUM. Rock gypsum is a chemical precipitate formed by the evaporation of cencentrated solutions such as seawater. It ranges in texture from massive/granular to fibrous depending on the size and shape of the gypsum crystals. Sediment type: chemical; Composition: gypsum; Grain Size: varible, commonly fibrous or granular and medium to fine

Dec 10, 2015Gypsum crystals are affected by the environment they grow in. The finer the soil, the more clear the crystals. The crystals found on the Great Salt Plains are chocolate brown in color due to the presence of iron oxide in the soil, and because these crystals form in wet soil, sand and clay particles are included within the crystal.

Welcome to the Home of Crystalline Phoenix Selenite Crystal. Crystalline Phoenix LLC is the legal custodian and caretaker of the Crystalline Phoenix, a massive, solid vein containing thousands of tons of selenite crystal, which is visible on the surface for over 100 yards.The selenite crystal deposit was laid down over 250 million years ago in a complex array of interlocking, massive

Feb 04, 2018Mineral Specimens and Crystals You can see thousands of crystals, gems and mineral specimens direct from the mines around the globe! Museum quality display specimens, large decorator mineral specimens polished quartz crystals of all sizes are being displayed for sale.. When you visit mineralminers, you're guaranteed to find Collector Quality Crystals At Miners' Prices!

Gypsum flowers most often exhibit simple twinning (known as contact twins); where parallel, long, needle-like crystals, sometimes having severe curves and bends, will frequently form "ram's horns", fishtail, arrow/spear-head, and swallowtail twins. Selenite crystals can also exhibit "arrow/spear-head" as well as "duck-bill

These formations are composed of aggregates of crystals which are fibrous or filament-like in nature. Most typically they are gypsum, but can be composed of a variety of other mineral salts like epsomite or halite. In form they are generally classified into four subtypes: hair, cotton, rope, and snow.

Habits: tabular, bladed or blocked crystals. Pinacoid faces may be present. Long thin crystals like those found in satin spar gypsum may show its flexible tenacity with curves. Twinning is also possible. Other habits can include massive, granular, earthy, and fibrous.


Microscopically, the gypsum bed is composed principally of small anhedral crystals of gypsum, ranging in diameter from 0.01 to 2.0 mm. Buff to gray shale and grains of calcite are present along some crystal boundaries. Selenite crystals having a maximum dimension of about 5 mm are relatively common in the upper and lower parts of the bed.

Bundles of fibrous crystals (size ranging from 1 to 30 μm) were observed in the black shale samples (Figs. 5a and 5c). Fibrous pseudo-hexagonal gypsum crystals were also observed in the thin siliceous phosphorite beds . Crystal clusters displayed flower-like shapes of ~40 μm.

While quartz typically forms prismatic (elongate, prism-like) crystals, in tiger's eye the original fibrous habit of crocidolite is preserved. The names of crystal habits are derived from: Predominant crystal faces (prism - prismatic, pyramid - pyramidal and pinacoid - platy). Crystal forms

Gypsum is composed of hydrated calcium sulphate and takes many forms, occurring as tabular, bladed and diamond shaped crystals. it also occurs in fibrous form, and in compact, granular masses, and as rosette shaped aggregates with included grains of sand. Gypsum varies from colourless to white, gray, yellowish, reddish, greenish, and brown.

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About Natural Gypsum. Gypsum is part of the same family as Selenite, Satin Spar and Desert Rose (Gypsum is the fibrous form). Gypsum is said to bring good luck and helps fertility and bones. Apparently it is thrown into the air by Aboriginal tribes during rain making ceremonies. Keep Gypsum away from water/moisture, as it will dissolve when wet.

Found as both massive material, including the alabaster variety; and clear crystals, the selenite variety; and, parallel fibrous, the satin spar variety. Typically colourless to white, transparent crystals, thick tabular to lenticular, sometimes prismatic.

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, in which case it is commonly called satin spar.

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