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Gregoryite

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John W. Gregory
Formula:
(Na2,K2,Ca)CO3
View Commodity Page:
Colour:
Brown, milky white.
Crystal System:
Hexagonal
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.


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Classification of GregoryiteHide

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 GregoryiteHide

Colour:
Brown, milky white.

Chemical Properties of GregoryiteHide

Formula:
(Na2,K2,Ca)CO3
IMA Formula:
Na2CO3

Crystallography of GregoryiteHide

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

Type Occurrence of GregoryiteHide

Synonyms of GregoryiteHide

Other Language Names for GregoryiteHide

German:Gregoryit
Spanish:Gregoryita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Nyerereite5 photos of Gregoryite associated with Nyerereite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

5.AA.05ZabuyeliteLi2CO3Mon. 2/m : B2/b
5.AA.10NatriteNa2CO3Mon.
5.AA.15NahcoliteNaHCO3Mon. 2/m
5.AA.20KaliciniteKHCO3Mon. 2/m
5.AA.25Teschemacherite(NH4)HCO3Orth. mmm (2/m 2/m 2/m) : Pccn
5.AA.30WegscheideriteNa5H3(CO3)4Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

14.1.2.1VateriteCaCO3Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc

Other InformationHide

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 petrologyHide

An essential component of rock names highlighted in red, an accessory component in rock names highlighted in green.

References for GregoryiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 GregoryiteHide

Localities for GregoryiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
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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