Weloganite Mineral Data

Weloganite Mineral Data +

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General Weloganite Information

Chemical Formula:

Sr3Na2Zr(CO3)6·3(H2O)

Composition:

Molecular Weight = 814.16 gm

Sodium 5.65 % Na 7.61 % Na₂O

Strontium 32.29 % Sr 38.18 % SrO

Zirconium 11.20 % Zr 15.13 % ZrO₂

Hydrogen 0.74 % H 6.64 % H₂O

Carbon 8.85 % C 32.43 % CO₂

Oxygen 41.27 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Sr₃Na₂Zr(CO₃)₆·3(H₂O)

Environment:

Alkalic sill intruding an Ordovician limestone.

IMA Status:

Approved IMA 1968

Locality:

St. Michel quarry, Montreal Island, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for William E. Logan (1798-1875), first director of the Canadian Geologic Survey.

Synonym:

ICSD 4241

IMA1967-042

PDF 27-790

Weloganite Image

Images:

Weloganite

Comments: Columnar aggregates of Weloganite crystals.
Location: Francon quarry, Montreal, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Images:

Weloganite Hydrodresserite

Comments: White spherical aggregates of hydrodresserite with radiating structure with columnar weloganite.
Location: Francon Quarry, Montreal, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Images:

Weloganite

Comments: Pseudo-hexagonal "stacked" plates of white weloganite with flat pedion termination.
Location: Francon quarry, Montr?al, Jacques Cartier Co., Qu?bec, Canada. Scale: Crystal size 3 mm.
© Tom Loomis / Dakota Matrix

Weloganite Crystallography

Axial Ratios:

a:b:c =1:1:0.7487

Cell Dimensions:

a = 8.988, b = 8.988, c = 6.73, Z = 1; alpha = 102.84°, beta = 116.42°, gamma = 59.99° V = 411.08 Den(Calc)= 3.29

Crystal System:

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

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

By Intensity(I/I_o): 2.817(1), 4.36(0.8), 2.594(0.7),

Crystal Structure:

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Grice J D , Perrault G , The Canadian Mineralogist , 13 (1975) p.209-216, The crystal structure of triclinic weloganite, Note: y-coordinate of Sr2 changed., Locality: St. Michel, Montreal Island, Quebec, Canada

Physical Properties of Weloganite

Cleavage:

[0001] Perfect

Color:

White, Lemon yellow, Amber, Colorless.

Density:

3.22

Diaphaniety:

Transparent to Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Pseudo Hexagonal - Crystals show a hexagonal outline.

Hardness:

3.5 - Copper Penny

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Weloganite

Gladstone-Dale:

CI meas= 0.005 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.027 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1876,KPDmeas= 0.1917,KC= 0.1928

Optical Data:

Biaxial (-), a=1.558, b=1.646, g=1.648, bire=0.0900, 2V(Calc)=16, 2V(Meas)=~15.

Calculated Properties of Weloganite

Electron Density:

r_electron=3.05 gm/cc
note: r_Weloganite=3.22 gm/cc.

Fermion Index

Fermion Index = 0.03634
Boson Index = 0.96366

Photoelectric:

PE_Weloganite= 51.38 barns/electron
U=PE_Weloganite x r_electron= 156.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Weloganite is Not Radioactive

Weloganite Classification

Dana Class:

15.3.4.4 (15)Hydrated Carbonates

(15.3)where A+m B++n (XO3)p · x(H2O), (m+n):p = 1:1 and containing U, Th, Zr, Y

(15.3.4)Dana Group

15.3.4.1 Donnayite-(Y) Sr3NaCaY(CO3)6·3(H2O) P1 1

15.3.4.2 Mckelveyite-(Y) Ba3Na(Ca,U)Y(CO3)6·3(H2O) P1 1

15.3.4.3 Mckelveyite-(Nd)* (Ba,Sr)(Ca,Na,Nd,REE)(CO3)2·3-10(H2O) P1 1

15.3.4.4 Weloganite Sr3Na2Zr(CO3)6·3(H2O) P1 1

Strunz Class:

V/D.04-30 V - Nitrates, Carbonates and Borates

V/D - Water-bearing carbonates without unfamiliar anions

V/D.04 - Donnayite-(Y) - Weloganite series

V/D.04-05 Ewaldite (Ba,Sr)(Ca,Na,Y,Ce)(CO3)2 P 6₃mc 6mm

V/D.04-10 Donnayite-(Y) Sr3NaCaY(CO3)6·3(H2O) P1 1

V/D.04-20 Mckelveyite-(Y) Ba3Na(Ca,U)Y(CO3)6·3(H2O) P1 1

V/D.04-25 Mckelveyite-(Nd)* (Ba,Sr)(Ca,Na,Nd,REE)(CO3)2·3-10(H2O) P1 1

V/D.04-30 Weloganite Sr3Na2Zr(CO3)6·3(H2O) P1 1

Other Weloganite Information

References:

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

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

Weloganite

Sr3Na2Zr(CO3)6·3(H2O)
Dana No: 15.3.4.4 Strunz No: V/D.04-30
Locality:

Notes: