Gregoryite
A valid IMA mineral species
This page is currently not sponsored. Click here to sponsor this page.
About Gregoryite
John W. Gregory
Formula:
(Na2,K2,Ca)CO3
Colour:
Brown, milky white.
Specific Gravity:
2.27 (Calculated)
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.
Compare UM1995-02-CO:BaCaClFKMgNaSr.
May occur as fluid inclusions in chromite (Potapov et al., 2022).
May occur as fluid inclusions in chromite (Potapov et al., 2022).
Unique Identifiers
Mindat ID:
6979
Long-form identifier:
mindat:1:1:6979:9
Similar Names
| Gregorite (of Adam) | A synonym of Bismutite |
| Gregorite (of Paris) | A synonym of 'Iron(III)-bearing Ilmenite' |
IMA Classification of Gregoryite
Approved
IMA Formula:
Na2CO3
Approval year:
1981
Classification of Gregoryite
5.AA.10
5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
A : Alkali carbonates
5 : CARBONATES (NITRATES)
A : Carbonates without additional anions, without H2O
A : Alkali carbonates
14.1.2.2
14 : ANHYDROUS NORMAL CARBONATES
1 : A(XO3)
14 : ANHYDROUS NORMAL CARBONATES
1 : A(XO3)
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Ggy | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Gregoryite
Transparency:
Transparent, Translucent
Colour:
Brown, milky white.
Density:
2.27 g/cm3 (Calculated)
Chemistry of Gregoryite
Mindat Formula:
(Na2,K2,Ca)CO3
Element Weights:
Crystallography of Gregoryite
Crystal System:
Hexagonal
Class (H-M):
6mm - Dihexagonal Pyramidal
Space Group:
P63mc
Cell Parameters:
a = 5.215 Å, c = 6.584 Å
Ratio:
a:c = 1 : 1.263
Unit Cell V:
155.07 ų (Calculated from Unit Cell)
Z:
2
Morphology:
minute imperfect rounded crystals.
Comment:
synthetic
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 2.66 Å | (100) |
| 2.61 Å | (75) |
| 3.29 Å | (40) |
| 2.137 Å | (40) |
| 1.863 Å | (30) |
| 3.72 Å | (27) |
| 1.707 Å | (8) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 36 : Carbonatites, kimberlites, and related igneous rocks |
Type Occurrence of Gregoryite
Geological Setting of Type Material:
lengaite carbonatite lava.
Associated Minerals at Type Locality:
Synonyms of Gregoryite
Other Language Names for Gregoryite
Common Associates
Associations Based on Photo Data:
| 5 photos of Gregoryite associated with Nyerereite | Na2Ca(CO3)2 |
Related Minerals - Strunz-mindat Grouping
| 5.AA.05 | Zabuyelite | Li2CO3 |
| 5.AA.10 | Natrite | Na2CO3 |
| 5.AA.15 | Nahcolite | NaHCO3 |
| 5.AA.20 | Kalicinite | KHCO3 |
| 5.AA.25 | Teschemacherite | (NH4)HCO3 |
| 5.AA.30 | Wegscheiderite | Na5H3(CO3)4 |
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 rock names highlighted in red, an accessory component in rock names highlighted in green.
Internet Links for Gregoryite
mindat.org URL:
https://www.mindat.org/min-6979.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Gregoryite
Reference List:
Gittins, J., McKie, D. (1980) Alkalic carbonatite magmas: Oldoinyo Lengai and its wider applicability. Lithos, 13 (2) 213-215 doi:10.1016/0024-4937(80)90021-3
Fleischer, Michael, Chao, George Y., Francis, Carl A. (1981) New Mineral Names. American Mineralogist, 66 (7-8) 878-879
Localities for Gregoryite
Showing 8 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Angola | |
| Castellano Calvo A et al. (2014) |
Brazil | |
| Guarino (2010) |
Canada | |
| Abersteiner et al. (2018) |
Russia | |
| Golovin et al. (2023) |
| Potapov et al. (2022) |
South Africa | |
| Giuliani et al. (2012) +2 other references |
| Abersteiner et al. (2024) |
Tanzania (TL) | |
| Lithos 13 (1980) +5 other references |
Quick NavTopAbout GregoryiteUnique IdentifiersSimilar NamesIMA Classification Classification Mineral SymbolsPhysical Properties Chemistry Crystallography X-Ray Powder DiffractionGeological EnvironmentType Occurrence SynonymsOther LanguagesCommon AssociatesStrunz-MindatOther InformationGregoryite in petrologyInternet Links References Localities Locality List
Ol Doinyo Lengai, Ngorongoro District, Arusha region, Tanzania