Gypsum: Difference atween revisions
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s Revertit edit o 196.207.88.110, chynged back tae last version bi AmaryllisGardener Tag: Rowback |
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{{Infobox mineral |
{{Infobox mineral |
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| name = Gypsum |
| name = Gypsum |
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| category = [[Sulfate |
| category = [[Sulfate minerals]] |
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| boxwidth = |
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| fracture = Conchoidal on {100}, splintery parallel tae [001] |
| fracture = Conchoidal on {100}, splintery parallel tae [001] |
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| tenacity = Flexible, inelastic. |
| tenacity = Flexible, inelastic. |
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| mohs = 1.5–2 (definin |
| mohs = 1.5–2 (definin mineral for 2) |
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| luster = Vitreous tae silky, pearly, or waxy |
| luster = Vitreous tae silky, pearly, or waxy |
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| refractive = n<sub>α</sub> = 1.519–1.521<br/> n<sub>β</sub> = 1.522–1.523<br/> n<sub>γ</sub> = 1.529–1.530 |
| refractive = n<sub>α</sub> = 1.519–1.521<br/> n<sub>β</sub> = 1.522–1.523<br/> n<sub>γ</sub> = 1.529–1.530 |
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| references = <ref>[http://rruff.geo.arizona.edu/doclib/hom/gypsum.pdf Gypsum in Handbook of Mineralogy]</ref><ref>[http://www.mindat.org/min-1784.html Gypsum at Mindat]</ref><ref name=Cornelis>Cornelis Klein and Cornelius S. Hurlbut, Jr., 1985, ''Manual of Mineralogy'', John Wiley, 20th ed., pp. 352–353, ISBN 0-471-80580-7</ref> |
| references = <ref>[http://rruff.geo.arizona.edu/doclib/hom/gypsum.pdf Gypsum in Handbook of Mineralogy]</ref><ref>[http://www.mindat.org/min-1784.html Gypsum at Mindat]</ref><ref name=Cornelis>Cornelis Klein and Cornelius S. Hurlbut, Jr., 1985, ''Manual of Mineralogy'', John Wiley, 20th ed., pp. 352–353, ISBN 0-471-80580-7</ref> |
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| var1 = Satin spar|var1text = Pearly, fibrous masses |
| var1 = Satin spar|var1text = Pearly, fibrous masses |
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| var2 = [[Selenite ( |
| var2 = [[Selenite (mineral)|Selenite]]|var2text = Transparent and bladed crystals |
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| var3 = [[Alabast]]|var3text = Fine-grained, slightly colored |
| var3 = [[Alabast]]|var3text = Fine-grained, slightly colored |
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'''Gypsum''' is a very saft [[sulfate |
'''Gypsum''' is a very saft [[sulfate mineral]] componed o [[calcium sulfate]] [[dihydrate]], wi the [[chemical formula]] CaSO<sub>4</sub>·2H<sub>2</sub>O.<ref name=Cornelis/> It can be uised as a [[fertilizer]], is the main constituent in mony furms o [[plaister]] an is widely mined. A very fine-grained white or lichtly tinted variety o gypsum, cried [[alabast]], haes been uised for [[sculpture]] bi mony culturs includin [[Auncient Egyp]], [[Mesopotamie]] an the [[Nottingham alabast]]s o medieval Ingland. It is the definition o a hairdness o 2 on the [[Mohs scale o mineral hardness]]. It furms as an [[evaporite]] mineral an as a hydration product o [[anhydrite]]. |
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==References== |
==References== |
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{{Reflist}} |
{{Reflist}} |
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[[Category:Calcium |
[[Category:Calcium minerals]] |
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[[Category:Sulphate |
[[Category:Sulphate minerals]] |
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[[Category:Sedimentary rocks]] |
[[Category:Sedimentary rocks]] |
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[[Category:Evaporite]] |
[[Category:Evaporite]] |
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[[Category:Alchemical substances]] |
[[Category:Alchemical substances]] |
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[[Category:Monoclinic |
[[Category:Monoclinic minerals]] |
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Latest reveesion aes o 15:18, 11 September 2020
| Gypsum | |
|---|---|
 Fibrous gypsum selenite shawin its translucent property. | |
| General | |
| Category | Sulfate minerals |
| Formula (repeatin unit) | CaSO4·2H2O |
| Strunz clessification | 07.CD.40 |
| Creestal seestem | Monoclinic 2/m – Prismatic |
| Space group | Monoclinic 2/m |
| Unit cell | a = 5.679(5) Å, b = 15.202(14) Å, c = 6.522(6) Å; β = 118.43°; Z=4 |
| Identification | |
| Colour | Colourless tae white; mey be yellae, tan, blue, pink, broun, reiddish brown or gray due tae impurities |
| Creestal habit | Massive, flat. Elangatit an generally prismatic crystals |
| Twinnin | Very common on {110} |
| Cleavage | Perfect on {010}, distinct on {100} |
| Fractur | Conchoidal on {100}, splintery parallel tae [001] |
| Tenacity | Flexible, inelastic. |
| Mohs scale haurdness | 1.5–2 (definin mineral for 2) |
| Skinkle | Vitreous tae silky, pearly, or waxy |
| Streak | White |
| Diaphaneity | Transparent tae translucent |
| Speceefic gravity | 2.31–2.33 |
| Optical properties | Biaxial (+) |
| Refractive index | nα = 1.519–1.521 nβ = 1.522–1.523 nγ = 1.529–1.530 |
| Birefringence | δ = 0.010 |
| Pleochroism | None |
| 2V angle | 58° |
| Fusibility | 5 |
| Solubility | Het, dilute HCl |
| References | [1][2][3] |
| Major varieties | |
| Satin spar | Pearly, fibrous masses |
| Selenite | Transparent and bladed crystals |
| Alabast | Fine-grained, slightly colored |
Gypsum is a very saft sulfate mineral componed o calcium sulfate dihydrate, wi the chemical formula CaSO4·2H2O.[3] It can be uised as a fertilizer, is the main constituent in mony furms o plaister an is widely mined. A very fine-grained white or lichtly tinted variety o gypsum, cried alabast, haes been uised for sculpture bi mony culturs includin Auncient Egyp, Mesopotamie an the Nottingham alabasts o medieval Ingland. It is the definition o a hairdness o 2 on the Mohs scale o mineral hardness. It furms as an evaporite mineral an as a hydration product o anhydrite.
References
[eedit | eedit soorce]- ↑ Gypsum in Handbook of Mineralogy
- ↑ Gypsum at Mindat
- ↑ a b Cornelis Klein and Cornelius S. Hurlbut, Jr., 1985, Manual of Mineralogy, John Wiley, 20th ed., pp. 352–353, ISBN 0-471-80580-7