Monteregianite-(Y) Mineral Data

Monteregianite-(Y) Mineral Data +

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General Monteregianite-(Y) Information

Chemical Formula:

(Na,K)6(Y,Ca)2Si16O38·10(H2O)

Composition:

Molecular Weight = 1,574.86 gm

Potassium 4.47 % K 5.38 % K₂O

Sodium 6.86 % Na 9.25 % Na₂O

Calcium 0.51 % Ca 0.71 % CaO

Yttrium 9.60 % Y 12.19 % Y₂O₃

Aluminum 0.34 % Al 0.65 % Al₂O₃

Silicon 28.18 % Si 60.28 % SiO₂

Hydrogen 1.28 % H 11.44 % H₂O

Oxygen 48.76 % O

______ ______

100.00 % 99.90 % = TOTAL OXIDE

Empirical Formula:

K_1.8Na_4.7Y_1.7Ca_0.2Si_15.8Al_0.2O₃₈·10(H₂O)

Environment:

In miarolitic cavities, metamorphosed inclusions in nepheline syenite.

IMA Status:

Approved IMA 1987

Locality:

Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the Monteregian Hills, a series of intrusions.

Synonym:

ICSD 202257

IMA1972-026

PDF 31-1087

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Monteregianite-(Y) Crystallography

Axial Ratios:

a:b:c =0.397:1:0.4014

Cell Dimensions:

a = 9.512, b = 23.956, c = 9.617, Z = 2; beta = 93.85° V = 2,186.47 Den(Calc)= 2.39

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: P 2₁/m

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

By Intensity(I/I_o): 4.42(1), 7.03(1), 12(1),

Crystal Structure:

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Ghose S , Sen Gupta P K , Campana C F , American Mineralogist , 72 (1987) p.365-374, Symmetry and crystal structure of monteregianite, Na4K2Y2Si16O38.10H2O, a, double-sheet silicate with zeolitic properties, Note: Several bond lengths cannot be reproduced with this data, but the authors, no longer have the original data, so they cannot check

Physical Properties of Monteregianite-(Y)

Cleavage:

[010] Perfect, [001] Good, [100] Distinct

Color:

Colorless, Greenish, Gray, Gray white, White.

Density:

2.42

Diaphaniety:

Transparent to Translucent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Pseudo Orthorhombic - Crystals show an orthorhombic shape.

Habit:

Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)

Hardness:

3.5 - Copper Penny

Luminescence:

Fluorescent, Short UV=green.

Luster:

Vitreous - Silky

Streak:

white

Optical Properties of Monteregianite-(Y)

Gladstone-Dale:

CI meas= 0.018 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2148,KPDmeas= 0.2121,KC= 0.216

Optical Data:

Biaxial (+), a=1.51, b=1.513, g=1.517, bire=0.0070

Pleochroism (x):

colorless.

Pleochroism (y):

colorless.

Pleochroism (z):

colorless.

Calculated Properties of Monteregianite-(Y)

Electron Density:

r_electron=2.38 gm/cc
note: r_{Monteregianite-(Y)}=2.39 gm/cc.

Fermion Index

Fermion Index = 0.0134
Boson Index = 0.9866

Photoelectric:

PE_{Monteregianite-(Y)}= 13.06 barns/electron
U=PE_{Monteregianite-(Y)} x r_electron= 31.07 barns/cc.

Radioactivity:

GRapi = 64.20 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Monteregianite-(Y) - barely detectable

Monteregianite-(Y) Classification

Dana Class:

72.5.1.2 (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings

(72.5)with corrugated and complex layers

(72.5.1)Rhodesite group

72.5.1.1 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m

72.5.1.2 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 2₁/m 2/m

72.5.1.3 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m

72.5.1.4 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m

72.5.1.5 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2

72.5.1.6 Seidite-(Ce)! Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4·5(H2O) C/2c 2/m

Strunz Class:

VIII/H.38-10 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica minerals with tetrahedral-double layers and related structures

VIII/H.38 - Monteregianite-(Y) - Wickenburgite series

VIII/H.38-10 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38·10(H2O) P 2₁/m 2/m

VIII/H.38-20 Rhodesite KHCa2Si8O19·5(H2O) Pmam 2/m 2/m 2/m

VIII/H.38-30 Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3·18(H2O) Pnmm 2/m 2/m 2/m

VIII/H.38-40 Hydrodelhayelite KCa2AlSi7O17(OH)2·6(H2O) Pnm21 mm2

VIII/H.38-50 Macdonaldite BaCa4[Si16O36(OH)2]·10(H2O) C mcm 2/m 2/m 2/m

VIII/H.38-60 Cymrite BaAl2Si2O8·(H2O) P 2₁ (pseudo-HEX) 2

VIII/H.38-65 Kampfite! Ba6[(Si,Al)O2]8(CO3)2Cl2(Cl,H2O)2 P 6₃mmc, P 6₂c, P 6₃mc, P 3₁ Hex

VIII/H.38-80 Lourenswalsite (K,Ba)2(Ti,Mg,Ca,Fe)4(Si,Al,Fe)6O14(OH)12 Unk (pseudo-HEX) Hex

VIII/H.38-90 Wickenburgite Pb3CaAl2Si10O27·4(H2O) P 3₁c 3m

Other Monteregianite-(Y) Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Monteregianite-(Y) :
1 - Alkali-Nuts(English) 2 - Alkali-Nuts(Francais) 3 -Am. Min. Crystal Structure Database 4 -Athena 5 - EUROmin Project 6 -Google Images 7 -Google Scholar 8 -Handbook of Mineralogy (MinSocAm) 9 -Handbook of Mineralogy (UofA) 10 -MinDAT 11 -MinMax(Deutsch) 12 -MinMax(English) 13 -Mineralienatlas (Deutsch) 14 -QUT Mineral Atlas 15 - WWW-MINCRYST

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Monteregianite-(Y)

(Na,K)6(Y,Ca)2Si16O38·10(H2O)
Dana No: 72.5.1.2 Strunz No: VIII/H.38-10
Locality:

Notes: