Montroyalite Mineral Data

Montroyalite Mineral Data +

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General Montroyalite Information

Chemical Formula:

Sr4Al8(CO3)3(OH,F)26·10-11(H2O)

Composition:

Molecular Weight = 1,384.60 gm

Strontium 25.31 % Sr 29.93 % SrO

Aluminum 15.59 % Al 29.46 % Al₂O₃

Hydrogen 2.48 % H 22.12 % H₂O

Carbon 2.60 % C 9.54 % CO₂

Oxygen 37.55 % O

Fluorine 16.47 % F 16.47 % F

- % F -6.93 % -O=F₂

______ ______

100.00 % 100.58 % = TOTAL OXIDE

Empirical Formula:

Sr₄Al₈(CO₃)₃(OH)₁₃F₁₂·10.5(H₂O)

IMA Status:

Approved IMA 1986

Locality:

Link to MinDat.org Location Data.

Synonym:

IMA1985-001

Montroyalite Image

Images:

Montroyalite

Comments: Translucent micro spherical montroyalite on matrix.
Location: Francon Quarry, Montreal, Quebec, Canada. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Montroyalite Crystallography

Crystal System:

TriclinicSpace Group: Unk.

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

By Intensity(I/I_o): 6.57(1), 3.283(0.55), 4(0.5),

Physical Properties of Montroyalite

Cleavage:

None

Color:

White.

Density:

2.667

Diaphaniety:

Translucent

Fracture:

Brittle - Splintery - Brittle fracture leaving splintery fragments.

Habit:

Fibrous - Crystals made up of fibers.

Hardness:

3.5 - Copper Penny

Luster:

Waxy

Streak:

white

Optical Properties of Montroyalite

Gladstone-Dale:

CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
KPDmeas= 0.1987,KC= 0.2074

Optical Data:

Biaxial (-), a=1.515, b=1.53, g=1.545, bire=0.0300, 2V(Calc)=88, 2V(Meas)=80-89.

Calculated Properties of Montroyalite

Electron Density:

r_electron=2.60 gm/cc
note: r_Montroyalite=2.67 gm/cc.

Fermion Index

Fermion Index = 0.01818
Boson Index = 0.98182

Photoelectric:

PE_Montroyalite= 28.03 barns/electron
U=PE_Montroyalite x r_electron= 73.01 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Montroyalite is Not Radioactive

Montroyalite Classification

Dana Class:

16b.5.3.1 (16b)Carbonates - Hydroxyl or Halogen

(16b.5)with miscellaneous formulae

(16b.5.3)Dana Group

16b.5.3.1 Montroyalite Sr4Al8(CO3)3(OH,F)26·10-11(H2O) Unk. Tri

Strunz Class:

V/E.08-80 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.08 - Strontiodresserite - Dundasite series

V/E.08-05 Thomasclarkite-(Y)! (Na,Ce)(Y,REE)(HCO3)(OH)3·4(H2O) P 2 2

V/E.08-10 Kamphaugite-(Y) Ca(Y,REE)(CO3)2(OH)2·3(H2O) P 4₁2₁2 4 2 2

V/E.08-20 Calcio-ancylite-(Ce) CaCe(CO3)2(OH)·(H2O) P mmm 2/m 2/m 2/m

V/E.08-25 Calcio-ancylite-(Nd) CaNd(CO3)2(OH)·(H2O) Pm m

V/E.08-28 Ancylite-(La)! Sr(La,Ce)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-30 Ancylite-(Ce) SrCe(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-40 Gysinite-(Nd) Pb(Nd,La)(CO3)2(OH)·(H2O) Pmcn 2/m 2/m 2/m

V/E.08-50 Strontiodresserite (Sr,Ca)Al2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-60 Dresserite BaAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-70 Hydrodresserite BaAl2(CO3)2(OH)4·3(H2O) P1 1

V/E.08-80 Montroyalite Sr4Al8(CO3)3(OH,F)26·10-11(H2O) Unk. Tri

V/E.08-90 Dundasite PbAl2(CO3)2(OH)4·(H2O) Pbmm 2/m 2/m 2/m

V/E.08-95 Petterdite! PbCr2(CO3)2(OH)4·H2O Pbnm 2/m 2/m 2/m

V/E.08-100 Barstowite Pb4(CO3)Cl6·(H2O) P 2₁/m 2/m

Other Montroyalite 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 Montroyalite :
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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Montroyalite

Sr4Al8(CO3)3(OH,F)26·10-11(H2O)
Dana No: 16b.5.3.1 Strunz No: V/E.08-80
Locality:

Notes: