Mineralogy Database

Perlialite Mineral Data

Search Webmineral :

General Perlialite Information

Help on Chemical  Formula: Chemical Formula: K8Tl4Al12Si24O72•20(H2O)
Help on Composition: Composition: Molecular Weight = 3,027.26 gm
   Potassium  10.33 %  K    12.45 % K2O
   Aluminum   10.70 %  Al   20.21 % Al2O3
   Thallium    6.75 %  Tl    7.54 % Tl2O3
   Silicon    22.27 %  Si   47.63 % SiO2
   Hydrogen    1.33 %  H    11.90 % H2O
   Oxygen     48.62 %  O
             ______        ______ 
             100.00 %       99.74 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K8TlAl12Si24O72•20(H2O)
Help on IMA Status: IMA Status: Approved IMA 1984
Help on Locality: Locality: Pegmatites of Mt.Eveslogchorr and Mt. Yukspor, Khibina alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after Lily Alekseevna Perekrest, teacher of mineralogy at the Kirovsk Mining Technical School
Help on Name Pronunciation: Name Pronunciation: Perlialite + Pronunciation Say PERLIALITE
Help on Synonym: Synonym: ICSD 69404
  PDF 38-395

Perlialite Image

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


Comments: Opaque white fibrous perlialite coating on syenite rock.
Location: Khibiny Massif, Kola Peninsula, Murmansk District, Russia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Perlialite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.40616
Help on Cell Dimensions: Cell Dimensions: a = 18.49, c = 7.51, Z = 1; V = 2,223.54 Den(Calc)= 2.26
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.306(1), 4.62(1), 16(1),

Physical Properties of Perlialite

Help on Color: Color: Pearl white.
Help on Density: Density: 2.14
Help on Hardness: Hardness: 4-5 - Fluorite-Apatite
Help on Luster: Luster: Pearly
Help on Streak: Streak: white

Optical Properties of Perlialite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.082 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.024 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2148,KPDmeas= 0.2269,KC= 0.2098
Ncalc = 1.45 - 1.47
Help on Optical Data: Optical Data: Biaxial (?), a=1.483, g=1.488, bire=0.0050

Calculated Properties of Perlialite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.24 gm/cc
note: Specific Gravity of Perlialite =2.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEPerlialite = 102.38 barns/electron
U=PEPerlialite x relectron= 229.46 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 147.85 (Gamma Ray American Petroleum Institute Units)
Concentration of Perlialite per GRapi unit = 0.68 (%)

Estimated Radioactivity from Perlialite - barely detectable


Perlialite Classification

Help on  Dana Class: Dana Class: (77)Tectosilicate Zeolite group
  (77.01)true zeolites
  (77.01.03)Gismondine and related species Gismondine Ca2Al4Si4O16•9(H2O) P 21/c 2/m Amicite K2Na2Al4Si4O16•5(H2O) I2 2 Garronite Na2Ca5Al12Si20O64•27(H2O) I 41/a 4/m Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn21 mm2 Harmotome (Ba,Na,K)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m Phillipsite-Ca! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m Phillipsite-K! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 21/m 2/m Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3m 4/m 3 2/m Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 63/mmc 6/m 2/m 2/m Mazzite-Na! Na8Al8Si28O72•30H2O P 63/mmc 6/m 2/m 2/m Merlinoite (K,Ca,Na,Ba)7Si23Al9O64•23(H2O) I mmm 2/m 2/m 2/m Montesommaite (K,Na)9Al9Si23O64•10(H2O) F dd2 mm2
Help on  Strunz Class: Strunz Class: 09.GC.25 09 - SILICATES (Germanates)
  09.G - Tektosilicates with Zeolitic H2O
  09.GC -Chains of doubly-connected 4-membered rings
09.GC.25 Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m

Other Perlialite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Perlialite :
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

Search for Perlialite using:

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

Visit our Advertisers for Perlialite :

Ask about Perlialite 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 Espaņol

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


Dana No: Strunz No: 09.GC.25





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