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Gregoryite

Pictures (2 Images total)

Nyerereit-Gregoryit
Views (File:
1474188746
): 891
Nyerereit-Gregoryit
Nyerereit-Gregoryit als Gemengteile in Karbonatlava; Vulkan Oldoinyo Lengai,Tansania; BB: 4 cm.
Copyright: Rockhounder; Contribution: Rockhounder
Collection: Rockhounder
Location: Tansania/Arusha, Region/Oldoinyo Lengai (Ol Doinyo Lengai) Vulkan
Mineral: Gregoryite
Image: 1474188746
License: Usage for Mineralienatlas project only
Nyerereit-Gregoryit

Nyerereit-Gregoryit als Gemengteile in Karbonatlava; Vulkan Oldoinyo Lengai,Tansania; BB: 4 cm.
Collection: Rockhounder
Copyright: Rockhounder
Contribution: Rockhounder 2016-09-18
Locality: Oldoinyo Lengai (Ol Doinyo Lengai) Vulkan / Arusha, Region / Tansania
Gregoryit, Nyerereit
Views (File:
1634143977
): 240
Gregoryit, Nyerereit
Oldoinyo Lengai, Tansania; Bb 7 mm; Probe in zugeschweißtem Glasröhrchen, da Gregoryit keine Feuchtigkeit verträgt.
Copyright: Guy Heinen; Contribution: guyhein
Collection: Guy Heinen
Location: Tansania/Arusha, Region/Oldoinyo Lengai (Ol Doinyo Lengai) Vulkan
Mineral: Gregoryite, Nyerereite
Image: 1634143977
License: Usage for Mineralienatlas project only
Gregoryit, Nyerereit

Oldoinyo Lengai, Tansania; Bb 7 mm; Probe in zugeschweißtem Glasröhrchen, da Gregoryit keine Feuchtigkeit verträgt.
Collection: Guy Heinen
Copyright: Guy Heinen
Contribution: guyhein 2021-10-13
Locality: Oldoinyo Lengai (Ol Doinyo Lengai) Vulkan / Arusha, Region / Tansania

Collectors Summary

Color weiß
Streak color weiß
Solubility +++ H2O
Crystal System hexagonal, P63mc

Chemism

Chemical formula

(Na2,K2,Ca)CO3

Chemical composition

Calcium, Natrium, Kalium, Kohlenstoff, Sauerstoff

Unit weight: 115.06362024 u; Number of atoms in the formula: 5.9

Info

Empirical formula:

((Na2)0.6(K2)0.3Ca0.1)CO3

Element

Symbol

Weight%

Atoms

Atoms%

Atom weight (u)

Sum weight (u)
Carbon

C

10.44

1

16.95

12.0107800

12.0107800
Oxygen

O

41.71

3

50.85

15.9994300

47.9982900
Sodium

Na

23.98

1.2

20.34

22.9897702

27.5877242
Potassium

K

20.39

0.6

10.17

39.0983100

23.4589860
Calcium

Ca

3.48

0.1

1.69

40.0784000

4.0078400

Analysis wt%

CaO : 9.10, SrO : 0.66, Na2O : 44.87, K2O : 3.95, CO2 : 36.22, SO3 : 4.28, P2O5 : 1.92, F : 0.40, Cl : 0.60 (Ref: Lithos 80)

Strunz 9th edition incl. updates

5.AA.10

5: Carbonate (Carbonate, Nitrate)
A: Carbonate ohne weitere Anionen, ohne H2O
A: Alkali-Carbonate
10:Natrit-Gregoryit-Gruppe

Lapis Classification

V/B.05-040

V: NITRATE, CARBONATE UND BORATE
B: Wasserfreie Carbonate [CO3] 2-, ohne fremde Anionen

Classification by Hölzel

5.AB.340

5: CARBONATES NITRATES ARSENITES SULFITES SELENITES TELLURITES IODATES
A: Carbonates (-Anions -Water)
B: Carbonates: hexagonal or trigonal
3: Other Double Carbonates

Dana 8th edition

14.01.02.02

14: Anhydrous Carbonates
01: Anhydrous Carbonates with Simple Formula A+ CO3
02: Vaterite Group

IMA status

Anerkannt von der CNMNC

Mineral status

anerkanntes Mineral

Optical Properties

Color

weiß

Streak color

weiß

2V angle

Uniaxial

Crystallography

Crystal System

hexagonal

Class (H-M)

6mm

Space Group number

186

Space Group

P63mc

Cell parameters a (Å)

5.22

Cell parameters b (Å)

-

Cell parameters c (Å)

6.58

Cell parameters a/b or c/a

1.261

Cell parameters c/b

-

Cell parameters α

90°

Cell parameters β

90°

Cell parameters γ

120°

Z

2

Volume (ų)

155.274

X-Ray Powder Diffraction

3.72(30),
3.29(40),
2.66(100),
2.61(70),
2.137(40),
1.863(30),
1.707(10),
1.303(10)
XRD chart Gregoryite

Calculated from d-spacing and intensity at 0.1541838 nm (Cu)

Crystals 3D

Open larger view

Physical Properties

Density (g/cm³)

2.27 (berechnet)

2.461 ( ρ calc. Mineralienatlas )

Instability

+++ H2O

(Co-)Type locality

(Co-)Type locality

Tansania/Arusha, Region/Oldoinyo Lengai (Ol Doinyo Lengai) Vulkan

Preface

Author (Name, Year)

Gittins & McKie, 1980

References

Lithos 13 (1980), 213

Other languages

German

Gregoryit

French

Gregoryite

English

Gregoryite

Spanish

Gregoryíta

Russian

Грегориит

Japanese

ｸﾞﾚｺﾞﾘｰ石（混合）

CNMNC (IMA)-Number

IMA 1981-045

CNMNC symbol

Symbol

Ggy

Locations with GPS information

IDs

GUSID (Global unique identifier short form) TnTptAyGHEqRxdkdJflkiw
GUID (Global unique identifier) B4E9744E-860C-4A1C-91C5-D91D25F9648B
Database ID 1451