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Gregoryite

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John W. Gregory
Formula:
Na2CO3
System:
Hexagonal
Colour:
Brown, milky white.
Name:
Named in 1980 by J. Gittins and D. McKie in honor of John Walter Gregory (27 January 1864, Bow, London, England – 2 June 1932, Megantoni Rapids, Urubamba River, Peru), British explorer and geologist, professor at the University of Melbourne, Melbourne, Australia and University of Glasgow, Glasgow, Scotland. He performed important work on glacial geology and also on the volcanism and structure of the East African Rift system. The Gregory Rift in the Great Rift Valley is also named in his honor.
This page provides mineralogical data about Gregoryite.


Classification of Gregoryite

Approved
5.AA.10

5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
A : Alkali carbonates
14.1.2.2

14 : ANHYDROUS NORMAL CARBONATES
1 : A(XO3)

Physical Properties of Gregoryite

Colour:
Brown, milky white.

Chemical Properties of Gregoryite

IMA Formula:
Na2CO3
Elements listed in formula:

Crystallography of Gregoryite

Crystal System:
Hexagonal
Cell Parameters:
a = 5.21Å, c = 6.58Å
Ratio:
a:c = 1 : 1.263
Unit Cell Volume:
V 154.68 ų (Calculated from Unit Cell)

Type Occurrence of Gregoryite

Relationship of Gregoryite to other Species

5.AA.05ZabuyeliteLi2CO3
5.AA.10NatriteNa2CO3
5.AA.15NahcoliteNaHCO3
5.AA.20KaliciniteKHCO3
5.AA.25Teschemacherite(NH4)HCO3
5.AA.30WegscheideriteNa5H3(CO3)4

Other Names for Gregoryite

Name in Other Languages:
German:Gregoryit
Spanish:Gregoryita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Gregoryite in petrology

An essential component of (items highlighted in red)
Common component of (items highlighted in red)

References for Gregoryite

Reference List:
Gittins, J., McKie, D. (1980) Alkalic carbonatite magmas: Oldoinyo Lengai and its wider applicability. Lithos: 13: 213-215.

Fleischer, M., Chao, G.Y., Francis, C.A. (1981) New mineral names. American Mineralogist: 66: 878-879.

Church, A.A., Jones, A.P. (1995) Silicate-carbonate immiscibility at Oldoinyo Lengai. Journal of Petrology: 36: 869-889.

Jambor, J.L., Pertsev, N.N., Roberts, A.C. (1996) New mineral names. American Mineralogist: 81: 516-520.

Zaitsev, A.N., Keller, J., Spratt, J., Jeffries, T.E., Sharygin, V.V. (2008) Chemical composition of nyerereite and gregoryite from natrocarbonatites of Oldoinyo Lengai volcano, Tanzania. Zapiski Rossiiskogo Mineralogicheskogo Obshchetstva: 137: 101-111.

Internet Links for Gregoryite

mindat.org URL:
https://www.mindat.org/min-6979.html
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Localities for Gregoryite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Tanzania (TL)
 
  • Arusha Region
Lithos 13 (1980), 213; American Mineralogist, 66, pp. 879 (1981); Mineralogical Magazine 1997 61 : 779-789; Zaitsev, A. N., & Keller, J. (2006). Mineralogical and chemical transformation of Oldoinyo Lengai natrocarbonatites, Tanzania. Lithos, 91(1), 191-207.; Mitchell, R. H. (1997). Carbonate-carbonate immiscibility, neighborite and potassium iron sulphide in Oldoinyo Lengai natrocarbonatite. Mineralogical Magazine, 61(6), 779-789.; Mattsson, H. B., & Reusser, E. (2010). Mineralogical and geochemical characterization of ashes from an early phase of the explosive September 2007 eruption of Oldoinyo Lengai (Tanzania). Journal of African Earth Sciences, 58(5), 752-763.; Victoria Sekisova, Victor Victorovich Sharygin, A. N. Zaitsev, Stanislav Strekopytov (2015) Liquid Immiscibility Геология и геофизика, 2015, т. 56, № 12, с. 2173—2197
Mineral and/or Locality  
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