Saharan gypsum desert rose from Tunisia (length 47 cm)Baryte rose from Cleveland County, Oklahoma (size: 10.2 × 7.1 × 5.5 cm)Large desert rose formation in the Tunisian desert
The rosette crystal habit tends to occur when the crystals form in arid sandy conditions,[1] such as the evaporation of a shallow salt basin. The crystals form a circular array of flat plates, giving the rock a shape similar to a rose blossom. Gypsum roses usually have better defined, sharper edges than baryte roses. Celestine and other bladed evaporite minerals may also form rosette clusters.[1] They can appear either as a single rose-like bloom or as clusters of blooms, typically ranging from pea-sized to 10 centimetres (4 in) in diameter.
The ambient sand that is incorporated into the crystal structure, or otherwise encrusts the crystals, varies with the local environment. If iron oxides are present, the rosettes take on a rusty tone.
The desert rose may also be known by the names: sand rose, Sahara rose, rose rock, selenite rose, gypsum rose and baryte (barite) rose.
Sand roses are found in large numbers in surroundings of the salt lake of Chott el Djerid in South-West Tunisia, as well as the neighboring regions in Algeria and Ghadames, Libya. Local inhabitants extract them and sell them as souvenirs to tourists, creating a sustainable income for the local population. Other sandroses are found elsewhere in the Sahara, but those extracted in the surroundings of the Salt Lake are particularly beautiful because of the high percentage of salt in their composition making them more crystalline and luminous. Others that contain more sand have a rusty tone, hence less brilliant in day or artificial light. Sand roses are also found in the vicinity of Abqaiq, Saudi Arabia.
Oklahomaedit
Rose rock in Oklahoma was formed during the Permian Period, 250 million years ago, when western and central Oklahoma was covered by a shallow sea. As the sea retreated, baryte precipitated out of the water and crystallized around grains of quartz sand. This left behind large formation of reddish sandstone, locally called Garber Sandstone, containing deposits of rose rock.[2][3][4]
The rose rock was selected as the official rock of the US state of Oklahoma in 1968.[2][5]
Sizeedit
Typically, desert roses measure from thirteen to twenty-five mm (1⁄2–1 in) in diameter. The largest recorded by the Oklahoma Geological Survey was 43 cm (17 in) across and 25 cm (10 in) high, weighing 57 kg (125 lb). Clusters of rose rocks up to one metre (39 in) tall and weighing more than 450 kg (1,000 lb) have been found.[6]
^London, David (2022-10-28). "The Barite Roses of Oklahoma: Oklahoma Geological Survey Information Series 13, 2009" (PDF). www.oge.ou.edu. (PDF) from the original on 2021-06-24. Retrieved 2022-10-28.
^Ham, W. E.; Merritt, C. A. (1944). "Barite in Oklahoma - Oklahoma Geological Survey, Circular 23" (PDF). www.ogs.ou.edu. (PDF) from the original on 2021-12-29. Retrieved 2022-10-28.
^"Barite Rose State Rock of Oklahoma" (PDF). www.ogs.ou.edu. 2022-10-28. (PDF) from the original on 2021-09-01. Retrieved 2022-10-28.
^. Oklahoma Tourism & Recreation Department. Archived from the original on 2017-10-30. Retrieved 2014-03-27.
External linksedit
Wikimedia Commons has media related to Desert roses.
desert, rose, crystal, desert, rose, intricate, rose, like, formation, crystal, clusters, gypsum, baryte, which, include, abundant, sand, grains, petals, crystals, flattened, axis, fanning, open, radiating, clusters, saharan, gypsum, desert, rose, from, tunisi. A desert rose is an intricate rose like formation of crystal clusters of gypsum or baryte which include abundant sand grains 1 The petals are crystals flattened on the c axis fanning open in radiating clusters Saharan gypsum desert rose from Tunisia length 47 cm Baryte rose from Cleveland County Oklahoma size 10 2 7 1 5 5 cm Large desert rose formation in the Tunisian desertThe rosette crystal habit tends to occur when the crystals form in arid sandy conditions 1 such as the evaporation of a shallow salt basin The crystals form a circular array of flat plates giving the rock a shape similar to a rose blossom Gypsum roses usually have better defined sharper edges than baryte roses Celestine and other bladed evaporite minerals may also form rosette clusters 1 They can appear either as a single rose like bloom or as clusters of blooms typically ranging from pea sized to 10 centimetres 4 in in diameter The ambient sand that is incorporated into the crystal structure or otherwise encrusts the crystals varies with the local environment If iron oxides are present the rosettes take on a rusty tone The desert rose may also be known by the names sand rose Sahara rose rose rock selenite rose gypsum rose and baryte barite rose Contents 1 Locations 1 1 Sahara 1 2 Oklahoma 2 Size 3 See also 4 References 5 External linksLocations editSahara edit Sand roses are found in large numbers in surroundings of the salt lake of Chott el Djerid in South West Tunisia as well as the neighboring regions in Algeria and Ghadames Libya Local inhabitants extract them and sell them as souvenirs to tourists creating a sustainable income for the local population Other sandroses are found elsewhere in the Sahara but those extracted in the surroundings of the Salt Lake are particularly beautiful because of the high percentage of salt in their composition making them more crystalline and luminous Others that contain more sand have a rusty tone hence less brilliant in day or artificial light Sand roses are also found in the vicinity of Abqaiq Saudi Arabia Oklahoma edit Rose rock in Oklahoma was formed during the Permian Period 250 million years ago when western and central Oklahoma was covered by a shallow sea As the sea retreated baryte precipitated out of the water and crystallized around grains of quartz sand This left behind large formation of reddish sandstone locally called Garber Sandstone containing deposits of rose rock 2 3 4 The rose rock was selected as the official rock of the US state of Oklahoma in 1968 2 5 Size editTypically desert roses measure from thirteen to twenty five mm 1 2 1 in in diameter The largest recorded by the Oklahoma Geological Survey was 43 cm 17 in across and 25 cm 10 in high weighing 57 kg 125 lb Clusters of rose rocks up to one metre 39 in tall and weighing more than 450 kg 1 000 lb have been found 6 See also editNational Museum of QatarReferences edit a b c Desert Rose Mindat org a b ROSE ROCK Oklahoma Historical Society London David 2022 10 28 The Barite Roses of Oklahoma Oklahoma Geological Survey Information Series 13 2009 PDF www oge ou edu Archived PDF from the original on 2021 06 24 Retrieved 2022 10 28 Ham W E Merritt C A 1944 Barite in Oklahoma Oklahoma Geological Survey Circular 23 PDF www ogs ou edu Archived PDF from the original on 2021 12 29 Retrieved 2022 10 28 Barite Rose State Rock of Oklahoma PDF www ogs ou edu 2022 10 28 Archived PDF from the original on 2021 09 01 Retrieved 2022 10 28 Noble is the Rose Rock Capital of the World Oklahoma Tourism amp Recreation Department Archived from the original on 2017 10 30 Retrieved 2014 03 27 External links edit nbsp Wikimedia Commons has media related to Desert roses Timberlake Rose Rock Museum in Noble Oklahoma 3D model of a desert rose Sahara Desert Rose Complete Guide This article about a specific sulfate mineral is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Desert rose crystal amp oldid 1216770837, wikipedia, wiki, book, books, library,
