Perlialite Mineral Data
General Perlialite Information
Chemical Formula:
K8Tl4Al12Si24O72•20(H2O)
Composition:
Molecular Weight = 3,027.26 gm
Potassium 10.33 % K 12.45 % K2 O
Aluminum 10.70 % Al 20.21 % Al2 O3
Thallium 6.75 % Tl 7.54 % Tl2 O3
Silicon 22.27 % Si 47.63 % SiO2
Hydrogen 1.33 % H 11.90 % H2 O
Oxygen 48.62 % O
______ ______
100.00 % 99.74 % = TOTAL OXIDE
Empirical Formula:
K8 TlAl12 Si24 O72 •20(H2 O)
IMA Status:
Approved IMA 1984
Locality:
Pegmatites of Mt.Eveslogchorr and Mt. Yukspor, Khibina alkaline massif, Kola Peninsula, Russia. Link to MinDat.org Location Data.
Name Origin:
Named after Lily Alekseevna Perekrest, teacher of mineralogy at the Kirovsk Mining Technical School
Name Pronunciation:
Perlialite + Pronunciation
Synonym:
ICSD 69404
PDF 38-395
Perlialite Image
Images:
Perlialite Crystallography
Axial Ratios:
a:c = 1:0.40616
Cell Dimensions:
a = 18.49, c = 7.51, Z = 1; V = 2,223.54 Den(Calc)= 2.26
Crystal System:
Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm
X Ray Diffraction:
By Intensity(I/Io ): 1.306(1), 4.62(1), 16(1),
Physical Properties of Perlialite
Color:
Pearl white.
Density:
2.14
Hardness:
4-5 - Fluorite-Apatite
Luster:
Pearly
Streak:
white
Optical Properties of Perlialite
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
Optical Data:
Biaxial (?), a=1.483, g=1.488, bire=0.0050
Calculated Properties of Perlialite
Electron Density:
Bulk Density (Electron Density)=2.24 gm/cc note: Specific Gravity of Perlialite =2.26 gm/cc.
Fermion Index:
Fermion Index = 0.01 Boson Index = 0.99
Photoelectric:
PEPerlialite = 102.38 barns/electronU=PEPerlialite x r electron = 229.46 barns/cc.
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
Dana Class:
77.01.03.08 (77) Tectosilicate Zeolite group
(77.01) true zeolites
(77.01.03) Gismondine and related species
77.01.03.01 Gismondine Ca2Al4Si4O16•9(H2O) P 21 /c 2/m
77.01.03.02 Amicite K2Na2Al4Si4O16•5(H2O) I2 2
77.01.03.03 Garronite Na2Ca5Al12Si20O64•27(H2O) I 41 /a 4/m
77.01.03.04 Gobbinsite (Na2,Ca)2K2Al6Si10O32•12(H2O) P mn21 mm2
77.01.03.05 Harmotome (Ba,Na,K)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.06 Phillipsite-Na (Na,K,Ca)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.06a Phillipsite-Ca ! (Ca,K,Na)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.06b Phillipsite-K ! (K,Na,Ca)1-2(Si,Al)8O16•6(H2O) P 21 /m 2/m
77.01.03.08 Perlialite K8Tl4Al12Si24O72•20(H2O) P 6/mmm 6/m 2/m 2/m
77.01.03.09 Paulingite-K (K2,Ca,Na2,Ba)5Al10Si35O90•45(H2O) Im3 m 4/m 3 2/m
77.01.03.09a Paulingite-Na ! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3 m 4/m 3 2/m
77.01.03.09b Paulingite-Ca ! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3 m 4/m 3 2/m
77.01.03.10 Mazzite-Mg K2CaMg2(Al,Si)36O72•28(H2O) P 63 /mmc 6/m 2/m 2/m
77.01.03.10a Mazzite-Na ! Na8Al8Si28O72•30H2O P 63 /mmc 6/m 2/m 2/m
77.01.03.11 Merlinoite (K,Ca,Na,Ba)7Si23Al9O64•23(H2O) I mmm 2/m 2/m 2/m
77.01.03.12 Montesommaite (K,Na)9Al9Si23O64•10(H2O) F dd2 mm2
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
References:
PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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
15 - WWW-MINCRYST
Search for Perlialite using:
[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
Espa�ol
Print or Cut-and-Paste your Perlialite Specimen Label here :
Perlialite
K8Tl4Al12Si24O72•20(H2O)
Dana No: 77.01.03.08 Strunz No: 09.GC.25
Locality:
Notes:
Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.