Mineralogy Database

Monteregianite-(Y) Mineral Data

Search Webmineral :

General Monteregianite-(Y) Information

Help on Chemical  Formula: Chemical Formula: (Na,K)6(Y,Ca)2Si16O38•10(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: K1.8Na4.7Y1.7Ca0.2Si15.8Al0.2O38•10(H2O)
Help on Environment: Environment: In miarolitic cavities, metamorphosed inclusions in nepheline syenite.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: Mont Saint-Hilaire, Quebec, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the Monteregian Hills, a series of intrusions.
Help on Name Pronunciation: Name Pronunciation: Monteregianite-(Y) + Pronunciation Say MONTEREGIANITE-(Y)
Help on Synonym: Synonym: ICSD 202257
  PDF 31-1087

Monteregianite-(Y) Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Feathery, radiating pinkish-white acicular monteregianite crystals on one end of greenish matrix.
Location: Desourdy Quarry, Mont Saint-Hilaire, Quebec, Canada. Scale: Specimen Size 5x2.5x2.5 cm..
© John Betts - Fine Minerals

Monteregianite-(Y) Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.397:1:0.4014
Help on Cell Dimensions: Cell Dimensions: a = 9.512, b = 23.956, c = 9.617, Z = 2; beta = 93.85° V = 2,186.47 Den(Calc)= 2.39
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 21/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.42(1), 7.03(1), 12(1),

Physical Properties of Monteregianite-(Y)

Help on Cleavage: Cleavage: {010} Perfect, {001} Good, {100} Distinct
Help on Color: Color: Colorless, Greenish, Gray, Gray white, White.
Help on Density: Density: 2.42
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Pseudo Orthorhombic - Crystals show an orthorhombic shape.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luminescence: Luminescence: Fluorescent, Short UV=green.
Help on Luster: Luster: Vitreous - Silky
Help on Streak: Streak: white

Optical Properties of Monteregianite-(Y)

Help on Gladstone-Dale: 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
Ncalc = 1.52
Help on Optical Data: Optical Data: Biaxial (+), a=1.51, b=1.513, g=1.517, bire=0.0070
Help on Pleochroism (x): Pleochroism (x): colorless.
Help on Pleochroism (y): Pleochroism (y): colorless.
Help on Pleochroism (z): Pleochroism (z): colorless.

Calculated Properties of Monteregianite-(Y)

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.38 gm/cc
note: Specific Gravity of Monteregianite-(Y) =2.39 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEMonteregianite-(Y) = 13.06 barns/electron
U=PEMonteregianite-(Y) x relectron= 31.07 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 64.20 (Gamma Ray American Petroleum Institute Units)
Concentration of Monteregianite-(Y) per GRapi unit = 1.56 (%)

Estimated Radioactivity from Monteregianite-(Y) - barely detectable


Monteregianite-(Y) Classification

Help on  Dana Class: Dana Class: (72)Phyllosilicate Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
  (72.05)with corrugated and complex layers
  (72.05.01)Rhodesite group Rhodesite KHCa2Si8O19•5(H2O) Pmam 2/m 2/m 2/m Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38•10(H2O) P 21/m 2/m Macdonaldite BaCa4[Si16O36(OH)2]•10(H2O) C mcm 2/m 2/m 2/m Delhayelite (Na,K)10Ca5Al6Si32O80(Cl2,F2,SO4)3•18(H2O) Pnmm 2/m 2/m 2/m Hydrodelhayelite KCa2AlSi7O17(OH)2•6(H2O) Pnm21 mm2 Seidite-(Ce)! Na4(Ce,Sr)2{Ti(OH)2(Si8O18)}(O,OH,F)4•5(H2O) C/2c 2/m
Help on  Strunz Class: Strunz Class: 09.EB.15 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EB -Double nets with 4- and 6-membered rings
09.EB.15 Monteregianite-(Y) (Na,K)6(Y,Ca)2Si16O38•10(H2O) P 21/m 2/m

Other Monteregianite-(Y) Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: 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 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Monteregianite-(Y) using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Monteregianite-(Y) :

Ask about Monteregianite-(Y) here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espa´┐Żol

Print or Cut-and-Paste your Monteregianite-(Y) Specimen Label here :


Dana No: Strunz No: 09.EB.15





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.