Nyerereite Mineral Data

Nyerereite Mineral Data +

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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-).

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 - PyramidalH-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),

Crystal Structure:

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McKie D , Frankis E J , Zeitschrift fur Kristallographie , 145 (1977) p.73-95, Nyerereite: A new volcanic carbonate mineral from Oldoinyo Lengai, Tanzania, Note: low-temperature polymorph that inverted from the high-temperature polymorph, Note: only half of the O atoms have been located, Locality: Oldoinyo Lengai, Tanzania

View Additional jPOWD Structure files for Nyerereite
[1]

Physical Properties of Nyerereite

Color:

Colorless.

Density:

2.541

Diaphaniety:

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

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:

r_electron=2.52 gm/cc
note: r_Nyerereite=2.54 gm/cc.

Fermion Index

Fermion Index = 0.00176
Boson Index = 0.99824

Photoelectric:

PE_Nyerereite= 2.90 barns/electron
U=PE_Nyerereite x r_electron= 7.29 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nyerereite is Not Radioactive

Nyerereite Classification

Dana Class:

14.3.4.1 (14)Anhydrous Carbonates

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

(14.3.4)Dana Group

14.3.4.1 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

Strunz Class:

V/B.05-20 V - Nitrates, Carbonates and Borates

V/B - Waterfree carbonates [CO3]2- without unfamiliar anions

V/B.05 - Eitelie - Shortite - Carbocernaite series

V/B.05-10 Eitelite Na2Mg(CO3)2 R 3 3

V/B.05-20 Nyerereite Na2Ca(CO3)2 C mc2₁ mm2

V/B.05-30 Natrofairchildite Na2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-40 Gregoryite (Na2,K2,Ca)CO3 P 6₃mc 6mm

V/B.05-50 Fairchildite K2Ca(CO3)2 P 6₃/mmc 6/m 2/m 2/m

V/B.05-55 Zemkorite (Na,K)2Ca(CO3)2 P 6₃/mmc, P 6₃mc, P 6₂c- Hex

V/B.05-60 Butschliite K2Ca(CO3)2 R 3m 3 2/m

V/B.05-70 Shortite Na2Ca2(CO3)3 Amm2 mm2

V/B.05-80 Sahamalite-(Ce) (Mg,Fe)Ce2(CO3)4 P 2₁/a 2/m

V/B.05-90 Remondite-(Ce) Na3(Ce,La,Ca,Na,Sr)3(CO3)5 P 2₁ 2

V/B.05-92 Remondite-(La)! Na3(La,Ce,Ca)3(CO3)5 P 2₁ 2

V/B.05-95 Petersenite-(Ce) (Na,Ca)4(Ce,La,Nd)2(CO3)5 P 2₁ 2

V/B.05-98 Calcioburbankite Na3(Ca,REE,Sr)3(CO3)5 P 6₃mc 6mm

V/B.05-100 Burbankite (Na,Ca)3(Sr,Ba,Ce)3(CO3)5 P 6₃/mmc 6/m 2/m 2/m

V/B.05-110 Khanneshite (NaCa)3(Ba,Sr,Ce,Ca)3(CO3)5 P 6₃mc 6mm

V/B.05-120 Carbocernaite (Ca,Na)(Sr,Ce,Ba)(CO3)2 P mc2₁ mm2

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Nyerereite

Na2Ca(CO3)2
Dana No: 14.3.4.1 Strunz No: V/B.05-20
Locality:

Notes: