Gregoryite

Gregoryite
General
CategoryCarbonate mineral
Formula
(repeating unit)		(Na2,K2,Ca)CO3
IMA symbolGgy[1]
Strunz classification5.AA.10
Crystal systemHexagonal
Crystal classDihexagonal pyramidal (6mm)
(same H-M symbol)
Space groupP63mc
Unit cella = 5.21
c = 6.58 [Å]; Z = 2
Identification
ColorBrown, milky white
Crystal habitPhenocrysts in carbonatite lava
StreakWhite
DiaphaneityTransparent to translucent
Specific gravity2.27 (calculated)
Optical propertiesUniaxial
SolubilitySoluble in water
References[2][3][4]

Gregoryite is an anhydrous carbonate mineral that is rich in potassium and sodium[5] with the chemical formula (Na2,K2,Ca)CO3.[2][6][7] It is one of the two main ingredients of natrocarbonatite, found naturally in the lava of Ol Doinyo Lengai volcano of Arusha Region, Tanzania, and the other being nyerereite.[8]

Because of its anhydrous nature, gregoryite reacts quickly with the environment, causing the dark lava to be converted to white substance within hours.[5]

Gregoryite was first described in 1980 and named after the British geologist and author John Walter Gregory (1864–1932), who studied the East African Rift Valley.[2][3] It occurs associated with nyerereite, alabandite, halite, sylvite, fluorite and calcite.[4]

References

  1. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b c Mindat.org
  3. ^ a b Webmineral.com
  4. ^ a b "Handbook of Mineralogy" (PDF). Archived from the original (PDF) on 2019-05-08. Retrieved 2011-06-03.
  5. ^ a b "Gregoryite definition". Dictionary of Geology. Retrieved 2011-05-21.
  6. ^ Mitchell, Roger H.; Bruce A. Kjarsgaard (2010). "Experimental Studies of the System Na2CO3–CaCO3–MgF2 at 0·1 GPa: Implications for the Differentiation and Low-temperature Crystallization of Natrocarbonatite". Journal of Petrology. 52 (7–8). Oxford Journals: 1265–1280. doi:10.1093/petrology/egq069.
  7. ^ Hay, Richard L (1989). "Holocene carbonatite-nephelinite tephra deposits of Oldoinyo Lengai, Tanzania". Journal of Volcanology and Geothermal Research. 37 (1). Elsevier (Netherlands): 77–91. Bibcode:1989JVGR...37...77H. doi:10.1016/0377-0273(89)90114-5.[dead link‍]
  8. ^ "World's Coolest Lava is in Africa". Volcano Watch. USGS Hawaiian Volcano Watch. Retrieved 2011-05-21.

Read other articles:

St Peter's Church, Waverton

Church in Cheshire, EnglandSt Peter's Church, WavertonSt Peter's Church, WavertonSt Peter's Church, WavertonLocation in Cheshire53°09′52″N 2°48′23″W / 53.1645°N 2.8065°W / 53.1645; -2.8065OS grid referenceSJ 462,633LocationWaverton, CheshireCountryEnglandDenominationAnglicanWebsiteSt Peter's Church, WavertonHistoryStatusParish churchDedicationSt PeterArchitectureFunctional statusActiveHeritage designationGrade II*Designated1 March 1967Architect(s)John Doug...

 

القطاع البنكي في تونس

اقتصاد تونس دينار تونسي البنك المركزي التونسي الفلاحة في تونس الصناعة في تونس قطاع الخدمات في تونس السياحة في تونس القطاع البنكي في تونس الشركات في تونس الخصخصة في تونس بورصة تونس عدل يوجد في تونس 23 بنكا تجاريا مقيما و8 غير مقيمة إضافة لبنكي أعمال.[1] تاريخ القطاع ترجع ب...

 

Spectacle Island (Port Jackson)

Place in New South Wales, AustraliaSpectacle IslandSydney, New South WalesSpectacle Island (front) and Cockatoo Island (rear), Sydney HarbourSpectacle IslandCoordinates33°50′56″S 151°09′50″E / 33.849°S 151.164°E / -33.849; 151.164Location11 km (7 mi) west of Sydney CBD Localities around Spectacle Island: Sydney Harbour Drummoyne Spectacle Island Cockatoo Island Sydney Harbour Spectacle Island is an island in the Parramatta River and Sydney H...

Park Chul-min

Ini adalah nama Korea; marganya adalah Park. Park Chul-minPark Chul-min pada tahun 2017Lahir18 Januari 1967 (umur 57)Gwangju, Korea SelatanPendidikanUniversitas Chung-Ang - Administrasi BisnisPekerjaanAktorTahun aktif1988-sekarangAgenSSGG CompanyNama KoreaHangul박철민 Hanja朴哲民 Alih AksaraBak Cheol-minMcCune–ReischauerPak Chŏl-min Park Chul-min (lahir 18 Januari 1967) adalah aktor Korea Selatan.[1] Filmografi Film Innocence (2020) Mr. Zoo: The Missing VIP (2020) (...

 

Maury Island hoax

Alleged UFO incident in the United States Artist impression of the Maury Island UFO incident The Maury Island incident refers to claims made by Fred Crisman and Harold Dahl of falling debris and threats by men in black following sightings of unidentified flying objects in the sky over Maury Island in Puget Sound. The pair would later claim the events had occurred on June 21, 1947. Background Main articles: 1947 flying disc craze, Kenneth Arnold UFO sighting, and Flight 105 UFO sighting 1947 ...

 

Perang Salib Baron

Perang Salib BaronBagian dari Perang SalibPeta yang menggambarkan keuntungan yang dibuat oleh perang salibWarna merah: Negara Perang Salib pada tahun 1239; Warna Merah Muda: Wilayah yang diperoleh pada tahun 1239–41Tanggal1239–1241LokasiAkko, Jaffa, Gaza, Tripoli, NablusHasil Kerajaan Yerusalem kembali ke ukuran terbesar sejak tahun 1187Perubahanwilayah Kristen menegosiasikan kembalinya Yerusalem, Ashkelon, Sidon, Tiberias, sebagian besar Galilea,[1] Betlehem, dan NazaretPihak ter...

Sunshine Special (automobile)

Official state car used by Franklin D Roosevelt FDR's 1939 Lincoln K series Presidential Limousine The Sunshine Special is a modified 1939 Lincoln Model K limousine that was used as the official state car by United States presidents Franklin D. Roosevelt and Harry Truman. Said to have been the First Presidential car to acquire its own personality, and most closely associated with FDR,[1] the V12 powered four-door convertible was specifically modified for the president by coachbuilder ...

 

Endometrial hyperplasia

Medical conditionEndometrial hyperplasiaMicrograph showing simple endometrial hyperplasia, where the gland-to-stroma ratio is preserved but the glands have an irregular shape and/or are dilated. Endometrial biopsy. H&E stain.SpecialtyGynaecology  Endometrial hyperplasia is a condition of excessive proliferation of the cells of the endometrium, or inner lining of the uterus. Most cases of endometrial hyperplasia result from high levels of estrogens, combined with insufficient levels o...

 

BBC OS

British news programme BBC OSFinal title card on TV used in 2023.Also known asOutside SourceOutside Source with Ros Atkins (TV) BBC OS (Radio)Created byBBC World NewsPresented byRos AtkinsJames Reynolds (radio)Country of originUnited KingdomOriginal languageEnglishProductionProduction locationsBroadcasting House, Central LondonRunning time90 minutes (TV)120 minutes (radio)Original releaseNetworkWorldwide:BBC World NewsBBC NewsBBC World ServiceUnited States:PBSRelease17 February 2014...

Montferrat (Var)

Pour les articles homonymes, voir Montferrat. Montferrat Hôtel de ville de Montferrat. Héraldique Administration Pays France Région Provence-Alpes-Côte d’Azur Département Var Arrondissement Draguignan Intercommunalité Dracénie Provence Verdon agglomération (ex Communauté d'agglomération dracénoise) Maire Mandat Raymond Gras 2020-2026 Code postal 83131 Code commune 83082 Démographie Populationmunicipale 1 655 hab. (2021 ) Densité 49 hab./km2 Géographie Coordonn�...

 

Otto Kruger

Disambiguazione – Se stai cercando il personaggio fumettistico creato da Sergio Bonelli, vedi Esse-Esse. Otto Kruger Otto Kruger (Toledo, 6 settembre 1885 – Woodland Hills, 6 settembre 1974) è stato un attore statunitense. Indice 1 Biografia 2 Filmografia parziale 2.1 Cinema 2.2 Televisione 3 Doppiatori italiani 4 Altri progetti 5 Collegamenti esterni Biografia Pronipote dell'ex-presidente del Sudafrica Paul Kruger, lavorò nel mondo dello spettacolo sin da bambino, fino al debutto a Br...

 

周處除三害 (電影)

周處除三害The Pig, The Snake and The Pigeon正式版海報基本资料导演黃精甫监制李烈黃江豐動作指導洪昰顥编剧黃精甫主演阮經天袁富華陳以文王淨李李仁謝瓊煖配乐盧律銘林孝親林思妤保卜摄影王金城剪辑黃精甫林雍益制片商一種態度電影股份有限公司片长134分鐘产地 臺灣语言國語粵語台語上映及发行上映日期 2023年10月6日 (2023-10-06)（台灣） 2023年11月2日 (2023-11-02)（香�...

Penghuni Terakhir

Artikel ini tidak memiliki referensi atau sumber tepercaya sehingga isinya tidak bisa dipastikan. Tolong bantu perbaiki artikel ini dengan menambahkan referensi yang layak. Tulisan tanpa sumber dapat dipertanyakan dan dihapus sewaktu-waktu.Cari sumber: Penghuni Terakhir – berita · surat kabar · buku · cendekiawan · JSTOR Penghuni TerakhirLogo Penghuni Terakhir Season 6 Tahun 2011PembuatHelmi YahyaPresenterTina Zakaria musim 1 - 4 Ben Kasyafani musim 5 ...

 

Transport in Glasgow

Overview of transport in Glasgow The Kingston Bridge carries the M8 motorway over the River Clyde in Glasgow city centre. The city of Glasgow, Scotland, has a transport system encompassing air, rail, road and an underground light metro line. Prior to 1962, the city was also served by trams. Commuters travelling into Glasgow from the neighbouring local authorities of North and South Lanarkshire, Renfrewshire, East Renfrewshire, and East and West Dunbartonshire have a major influence on travel ...

 

هيبوكلوريت الصوديوم

هيبوكلوريت الصوديوم هيبوكلوريت الصوديوم هيبوكلوريت الصوديوم هيبوكلوريت الصوديوم الاسم النظامي (IUPAC) هيبوكلوريت الصوديوم أسماء أخرى تحت كلوريت الصوديوم، ماء جافيلAntiforminBleachChloride of sodaIn dilution:Carrel-Dakin solutionModified Dakin's solutionSurgical chlorinated soda solution المعرفات رقم CAS 7681-52-9 Y بوب كيم (PubChem) 23...

Yakima War

19th-century conflict between the United States and the Yakama people Yakima WarPart of the American Indian WarsIllustration of U.S. Army artillerymen in 1855Date1855–1858LocationWashington Territory, United StatesResult United States victoryBelligerents  United States Snoqualmie Yakama Walla Walla Umatilla Nisqually Cayuse Palouse Puyallup KlickitatCommanders and leaders Isaac Stevens Joel Palmer George Wright Chief Patkanim Chief Kamiakin Chief Leschi Chief KanaskatUnits involved 4th...

 

Judas Priest

Judas PriestJudas Priest di panggung pada Moline, Illinois.Informasi latar belakangAsalBirmingham, InggrisGenreHeavy metalTahun aktif1969–sekarangLabelEpic, Columbia, CMC, Koch, RCA, GullArtis terkaitTrapeze, Fight, The Flying Hat Band, Halford, 2wo, Racer X, Iced Earth, Al Atkins, Beyond FearSitus webOfficial websiteAnggotaRob HalfordGlenn TiptonK. K. DowningIan HillScott TravisMantan anggotaSee: Judas Priest mantan anggota Judas Priest adalah salah satu kelompok musik heavy metal paling b...

 

Birdwatching

Amateur observation of birds For other uses, see Birdwatching (disambiguation). Birding and Birdwatchers redirect here. For the hunting of birds, see Fowling. For the capture of birds, see Bird trapping. For the magazine, see Birding (magazine). For the film, see Birdwatchers (film). Three people birdwatching with binoculars Birdwatching, or birding, is the observing of birds, either as a recreational activity or as a form of citizen science. A birdwatcher may observe by using their naked eye...

Echinacea purpurea

Species of flowering plant in the daisy family Asteraceae Purple coneflower redirects here. This common name is sometimes used for other purple flowered plants in the genus Echinacea. Echinacea purpurea At a prairie preserve in southwest Arkansas Conservation status Apparently Secure  (NatureServe)[1] Scientific classification Kingdom: Plantae Clade: Tracheophytes Clade: Angiosperms Clade: Eudicots Clade: Asterids Order: Asterales Family: Asteraceae Genus: Echinacea Species: E.&#...

 

的黎波里

  关于与「的黎波里」標題相近或相同的条目页，請見「的黎波里 (消歧義)」。 的黎波里طرابلس الغربTarabulus al-Gharb最上：That El Emad Towers（英语：That El Emad Towers）；中间：烈士广场；左下：馬爾庫斯·奧列里烏斯拱门；右下：Souq al-Mushir – Tripoli Medina 旗幟的黎波里在利比亚的位置坐标：32°52′31″N 13°11′15″E / 32.87519°N 13.18746°E / 32.87519; 13.18746...