Nyerereite Mineral Data

General Nyerereite Information

Chemical Formula:

Na2Ca(CO3)2

Composition:

Molecular Weight = 206.08 gm

Sodium 22.31 % Na 30.08 % Na₂O

Calcium 19.45 % Ca 27.21 % CaO

Carbon 11.66 % C 42.71 % CO₂

Oxygen 46.58 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂Ca(CO₃)₂

Environment:

Major constituent in carbonatite lavas. Dimorphous with zemkorite.

IMA Status:

Approved IMA 1963

Locality:

Mt. Oldoinyo Lengai, Tanzania. Link to MinDat.org Location Data.

Name Origin:

Named after the president of Tanzania, Julius K. Nyerere (1922-).

Name Pronunciation:

Nyerereite + Pronunciation

Synonym:

IMA1963-014

Nyerereite Image

Images:

Nyerereite Gregoryite

Comments: Sodium (nyereteite) and potassium (gregoryite) carbonates, not stable in normal atmosphere, collected molten from the volcano and maintained in inert argon atmosphere.
Location: Ol Doinyo Lengai Vulkan, Maasai Steppe, East Africa Rift Valley, Tanzania. See Link. Scale: Rock size 2 cm.
© Richard Dale / Dale Minerals

Nyerereite Crystallography

Axial Ratios:

a:b:c =0.5725:1:1.4465

Cell Dimensions:

a = 5.044, b = 8.809, c = 12.743, Z = 4; V = 566.20 Den(Calc)= 2.42

Crystal System:

Orthorhombic - Pyramidal H-M Symbol (mm2) Space Group: C mc2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.046(1), 2.07(0.9), 2.16(0.9),2.54(0.9), 6.377(0.9), 4.385(0.9), 2.2(0.8), 2.58(0.8),

Physical Properties of Nyerereite

Color:

Colorless.

Density:

2.541

Diaphaneity:

Transparent

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Habit:

Twinning Common - Crystals are usually twinned.

Streak:

white

Optical Properties of Nyerereite

Gladstone-Dale:

CI meas= -0.013 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.063 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2174,KPDmeas= 0.207,KC= 0.2044
Ncalc = 1.49 - 1.52

Optical Data:

Biaxial (-), a=1.511, b=1.533, g=1.534, bire=0.0230, 2V(Calc)=22, 2V(Meas)=29.

Calculated Properties of Nyerereite

Electron Density:

Bulk Density (Electron Density)=2.52 gm/cc
note: Specific Gravity of Nyerereite =2.54 gm/cc.

Fermion Index:

Fermion Index = 0.0017684043
Boson Index = 0.9982315957

Photoelectric:

PE_Nyerereite= 2.90 barns/electron
U=PE_Nyerereite x rElectron Density= 7.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nyerereite is Not Radioactive

Nyerereite Classification

Dana Class:

14.03.04.01 (14)Anhydrous Carbonates

(14.03)with Compound Formula A+2 B++ (CO3)2

(14.03.04)Dana Group

14.03.04.01 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

Strunz Class:

05.AC.10 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AC -Alkali and alkali-earth carbonates

05.AC.10 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

05.AC.10 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

05.AC.10 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

Other Nyerereite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Nyerereite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - WWW-MINCRYST

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Nyerereite

Na2Ca(CO3)2
Dana No: 14.03.04.01 Strunz No: 05.AC.10
Locality:

Notes:

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