Selenite (mineral) - Wikipedia
The main distinguishing characteristics of crystalline gypsum are its softness (hardness 2 on Mohs scale, soft enough to scratch with a fingernail) and its three unequal cleavages. [4][5] Other distinguishing characteristics include its crystal habits, pearly lustre, easy fusibility with loss of water, and solubility in hot dilute hydrochloric a...
Selenite | Properties, Formation, Occurrence» Geology Science
2024年3月6日 · What is the hardness of selenite? Selenite has a relatively low hardness of around 2 on the Mohs scale. It is quite soft and can be easily scratched with a fingernail or a copper penny. Is selenite soluble in water? Yes, selenite is soluble in water.
Gypsum, selenite: The mineral gypsum information and pictures
Detailed description, properties, and locality information guide about the mineral gypsum (selenite).
Gypsum Mineral | Uses and Properties - Geology.com
Selenite Gypsum: Selenite, a variety of gypsum from Penfield, New York. Specimen is approximately 2-1/2 inches (6.4 centimeters) across.
Gypsum Mineral Data
From the Greek, gyps meaning "burned" mineral. Selenite from the Greek in allusion to its pearly luster (moon light) on cleavage fragments. Comments: Bladed rosettes of gypsum. Location: unknown. Scale: Specimen size 6 cm. Comments: Pencil-sized acicular crystals of gypsum. Location: Naica, Chihuahua, S.A., Mexico. Scale: Specimen size 5 cm.
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, in which case it is commonly called "satin spar".
Gypsum (selenite) - Ohio Department of Natural Resources
Gypsum (selenite, CaSO 4 •2H 2 O) is a soft, colorless, transparent mineral that occurs in prismatic crystals found in gypsum beds. Crystallization: Monoclinic; prismatic; 2/m Habit: Commonly well crystallized, prismatic or tabular; may form rosettes; also commonly massive.
Gypsum: Mineral information, data and localities. - mindat.org
Found as massive material (including the alabaster variety), clear crystals (the selenite variety) and as parallel fibrous aggregates (the satin spar variety). Typically occurs as colourless to white, transparent crystals, thick tabular to lenticular, sometimes prismatic. May dehydrate to the hemihydrate bassanite at elevated temperatures.
Gypsum | Common Minerals
Gypsum is a very soft mineral that is easily identified by its hardness, cleavage, and solubility in water. Typically clear to white, gypsum may be colored reddish to brown or yellow if impurities are present. Most gypsum occurs in its massive form, as layers of rock that often intercalate layers of shale, limestone, or dolostone.
Gypsum Selenite - Celestial Earth Minerals
Selenite is transparent to translucent with a hardness of 1.5-2.0, perfect cleavage in one direction, vitreous to pearly luster, and a specific gravity of 2.3-2.4. It occurs mainly in chemical-sedimentary, marine-evaporite formations of sandstone, limestone, or rock salt.