Wegscheiderite Mineral Data

Wegscheiderite Mineral Data +

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General Wegscheiderite Information

Chemical Formula:

Na5(CO3)(HCO3)3

Composition:

Molecular Weight = 358.01 gm

Sodium 32.11 % Na 43.28 % Na₂O

Hydrogen 0.84 % H 7.55 % H₂O

Carbon 13.42 % C 49.17 % CO₂

Oxygen 53.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₅(CO₃)(HCO₃)₃

IMA Status:

Approved IMA 1962

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 68711

PDF 15-653

Wegscheiderite Image

Images:

Wegscheiderite

Comments: Greasy pale pink translucent platy crystalline wegscheiderite in syenite rock.
Location: Mount Alluaiv, Lovozero Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Wegscheiderite Crystallography

Axial Ratios:

a:b:c =0.6452:1:0.2227

Cell Dimensions:

a = 10.04, b = 15.56, c = 3.466, Z = 2; alpha = 91.917°, beta = 95.817°, gamma = 108.667° V = 510.06 Den(Calc)= 2.33

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.95(1), 2.64(0.6), 3.68(0.6),

Crystal Structure:

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Fernandes N G , Tellgren R , Olovsson I , Acta Crystallographica, Section B , 46 (1990) p.466-474, Structure and electron density of pentasodium trihydrogentetracarbonate, Locality: synthetic, Note: anisotropic displacement factors from ICSD

Physical Properties of Wegscheiderite

Cleavage:

[???] Good

Color:

Colorless.

Density:

2.34

Diaphaniety:

Transparent

Fracture:

Conchoidal - Uneven - Uneven fracture producing small, conchoidal fragments.

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Wegscheiderite

Gladstone-Dale:

CI meas= 0.004 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2117,KPDmeas= 0.2108,KC= 0.2116

Optical Data:

Biaxial (-), a=1.433, b=1.519, g=1.528, bire=0.0950, 2V(Calc)=34, 2V(Meas)=32.4.

Calculated Properties of Wegscheiderite

Electron Density:

r_electron=2.32 gm/cc
note: r_{Wegscheiderite}=2.33 gm/cc.

Fermion Index

Fermion Index = 0.00173
Boson Index = 0.99827

Photoelectric:

PE_{Wegscheiderite}= 0.70 barns/electron
U=PE_{Wegscheiderite} x r_electron= 1.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Wegscheiderite is Not Radioactive

Wegscheiderite Classification

Dana Class:

13.1.6.1 (13)Acid Carbonates

(13.1)with miscellaneous formulae

(13.1.6)Dana Group

13.1.6.1 Wegscheiderite Na5(CO3)(HCO3)3 P1 1

Strunz Class:

V/B.01-60 V - Nitrates, Carbonates and Borates

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

V/B.01 - Zabuyelite - Wegscheiderite series

V/B.01-10 Zabuyelite Li2CO3 C 2/c 2/m

V/B.01-20 Nahcolite NaHCO3 P 2₁/n 2/m

V/B.01-30 Kalicinite KHCO3 P 2₁/a 2/m

V/B.01-40 Teschemacherite (NH4)HCO3 Pccn 2/m 2/m 2/m

V/B.01-50 Natrite Na2CO3 C 2 or Cm Mono

V/B.01-60 Wegscheiderite Na5(CO3)(HCO3)3 P1 1

Other Wegscheiderite Information

References:

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

See Also:

Links to other databases for Wegscheiderite :
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 -École des Mines de Paris

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Wegscheiderite

Na5(CO3)(HCO3)3
Dana No: 13.1.6.1 Strunz No: V/B.01-60
Locality:

Notes: