Perlialite Mineral Data

General Perlialite Information

Chemical Formula:

K8Tl4Al12Si24O72•20(H2O)

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

Empirical Formula:

K₈TlAl₁₂Si₂₄O₇₂•20(H₂O)

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

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

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 DipyramidalH-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmm

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

By Intensity(I/I_o): 1.306(1), 4.62(1), 16(1),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Artioli G , Kvick A , European Journal of Mineralogy , 2 (1990) p.749-759, Synchrotron X-ray Rietveld study of perlialite, the natural counterpart of synthetic zeolite-L, Sample: data collected with synchrotron radiation

View Additional jPOWD Structure files for Perlialite
[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:

PE_Perlialite= 102.38 barns/electron
U=PE_Perlialite 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) Im3m 4/m 3 2/m

77.01.03.09a Paulingite-Na! (Na2,K2,Ca,Ba)5Al10Si35O90•45(H2O) Im3m 4/m 3 2/m

77.01.03.09b Paulingite-Ca! (Ca,K,Na,Ba)5[Al10Si35O84]•34(H2O) Im3m 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 :

A Bijoux Google Search for Perlialite
Adam's Minerals Google Search for Perlialite
Cape Minerals Google Search for Perlialite
Dakota Matrix Minerals Google Search for Perlialite
Excalibur Mineral Corp. Google Search for Perlialite
Exceptional Minerals Google Search for Perlialite
John Betts Fine Minerals Search for Perlialite
McDougall Minerals Google Search for Perlialite
Mineral News Website Link
Rock and Mineral Shows Google Search for Perlialite
Weinrich Minerals, Inc. Google Search 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 Español

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: