Wegscheiderite Mineral Data

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

Environment:

Replacement of trona in a lacustrine deposit.

IMA Status:

Approved IMA 1962

Locality:

Perkins Well No. 1, the Perkins Well No. 2, in the Green River Formation about 10 km west, and as large crystals in the Grierson Well No. 1, about 20 km northwest, Sweetwater Co., Utah Link to MinDat.org Location Data.

Name Origin:

Named for Rudolf Franz Johann Wegscheider (1859-1935), Austrian chemist, who first synthesized the compound.

Name Pronunciation:

Wegscheiderite + Pronunciation

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

Diaphaneity:

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= 0.004 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2108,KPDmeas= 0.2108,KC= 0.2116
Ncalc = 1.5

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:

Bulk Density (Electron Density)=2.33 gm/cc
note: Specific Gravity of Wegscheiderite =2.34 gm/cc.

Fermion Index:

Fermion Index = 0.0017348539
Boson Index = 0.9982651461

Photoelectric:

PE_{Wegscheiderite}= 0.70 barns/electron
U=PE_{Wegscheiderite} x rElectron Density= 1.62 barns/cc.

Radioactivity:

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

Wegscheiderite Classification

Dana Class:

13.01.06.01 (13)Acid Carbonates

(13.01)with miscellaneous formulae

(13.01.06)Dana Group

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

Strunz Class:

05.AA.30 05 - CARBONATES (NITRATES)

05.A - Carbonates without additional anions, without H2O

05.AA -Alkali Carbonates

05.AA.30 Wegscheiderite Na5(CO3)(HCO3)3 P1 1

Other Wegscheiderite Information

References:

NAME( AntBidBlaNic3) 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 - 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

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Print or Cut-and-Paste your Wegscheiderite Specimen Label here :

Wegscheiderite

Na5(CO3)(HCO3)3
Dana No: 13.01.06.01 Strunz No: 05.AA.30
Locality:

Notes: