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Pezzottaite Mineral Data

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General Pezzottaite Information

Help on Chemical  Formula: Chemical Formula: Cs(Be2Li)Al2Si6O18
Help on Composition: Composition: Molecular Weight = 658.80 gm
   Cesium     14.93 %  Cs   15.83 % Cs2O
   Potassium   0.06 %  K     0.07 % K2O
   Rubidium    0.52 %  Rb    0.57 % Rb2O
   Sodium      1.40 %  Na    1.88 % Na2O
   Lithium     0.99 %  Li    2.13 % Li2O
   Beryllium   4.19 %  Be   11.62 % BeO
   Aluminum    8.35 %  Al   15.79 % Al2O3
   Silicon    25.58 %  Si   54.72 % SiO2
   Hydrogen    0.03 %  H     0.27 % H2O
   Oxygen     43.96 %  O
             ______        ______ 
             100.00 %      102.88 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cs0.74Rb0.04K0.01Na0.4Be3.06Li0.94Al2.04Si6O18(H2O)0.1
Help on Environment: Environment: Late-stage pocket mineral formed in a granitic pegmatite. Beryl group
Help on IMA Status: IMA Status: Approved IMA 2004 (Dana # Added)
Help on Locality: Locality: Sakavalana pegmatite, located 25 km south of the village of Mandosonoro, SW of Antsirabe, Fianarantsoa province, central Madagascar. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Federico Pezzotta of the Museo Civico, Milano, Italy for his work on the granitic pegmatites of Madagascar.
Help on Synonym: Synonym: IMA2003-022

Pezzottaite Image

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Comments: Hot-pink, hexagonal, floater crystal of pezzottaite.
Location: Ambatovita, Mandrosonoro, Antsirabe, Madagascar. Scale: Crystal size 1.6x1.2x0.6 cm.
© Fabre Minerals

Pezzottaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.74357
Help on Cell Dimensions: Cell Dimensions: a = 15.946, c = 27.803, Z = 18; V = 6,122.46 Den(Calc)= 3.22
Help on Crystal System: Crystal System: Trigonal - Ditrigonal Pyramidal H-M Symbol (3m) Space Group: R 3c
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.271(1)(036), 2.871(0.52)(153), 3.027(0.41)(146), 3.09(0.29)(150), 3.019(0.29), 1.636(0.14)(0.6.12), 2.215(0.14)(207), 1.749(0.12)(3

Physical Properties of Pezzottaite

Help on Cleavage: Cleavage: {001} Imperfect
Help on Color: Color: Raspberry red, Pink.
Help on Density: Density: 2.97
Help on Diaphaneity: Diaphaneity: Translucent to transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Hexagonal - Six-sided crystal shape in cross-section or habit.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 8 - Topaz
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Pezzottaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.075 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1898,KPDmeas= 0.2057,KC= 0.2051
Ncalc = 1.61 - 1.66
Help on Optical Data: Optical Data: Uniaxial (-), e=1.601-1.611, w=1.612-1.62, bire=0.0090-0.0110.

Calculated Properties of Pezzottaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.86 gm/cc
note: Specific Gravity of Pezzottaite =2.97 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEPezzottaite = 60.91 barns/electron
U=PEPezzottaite x relectron= 174.27 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 212.96 (Gamma Ray American Petroleum Institute Units)
Concentration of Pezzottaite per GRapi unit = 0.47 (%)

Estimated Radioactivity from Pezzottaite - barely detectable


Pezzottaite Classification

Help on  Dana Class: Dana Class: (61)Cyclosilicate Six-Membered Rings
  (61.01)with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.01)Beryl group Beryl Be3Al2Si6O18 P 6/mmc 6/m 2/m 2/m Bazzite Be3(Sc,Al)2Si6O18 P 6/mcc 6/m 2/m 2/m Indialite Mg2Al4Si5O18 P 6/mcc 6/m 2/m 2/m Stoppaniite! (Fe,Al,Mg)4(Na,[])2[Be6Si12O36]•2(H2O) P 6/mmc 6/m 2/m 2/m Pezzottaite! Cs(Be2Li)Al2Si6O18 R 3c 3m
Help on  Strunz Class: Strunz Class: 09.CJ.05 09 - SILICATES (Germanates)
  09.C - Cyclosilicates
  09.CJ -[Si6O18]12- 6-membered single rings (sechser-Einfachringe),
09.CJ.05 Beryl Be3Al2Si6O18 P 6/mmc 6/m 2/m 2/m
09.CJ.05 Bazzite Be3(Sc,Al)2Si6O18 P 6/mcc 6/m 2/m 2/m
09.CJ.05 Indialite Mg2Al4Si5O18 P 6/mcc 6/m 2/m 2/m
09.CJ.05 Stoppaniite! (Fe,Al,Mg)4(Na,[])2[Be6Si12O36]•2(H2O) P 6/mmc 6/m 2/m 2/m
09.CJ.05 Pezzottaite! Cs(Be2Li)Al2Si6O18 R 3c 3m

Other Pezzottaite Information

Help on References: References: NAME( MinRec 35:369) PHYS. PROP.(MinRec 35:369) OPTIC PROP.(MinRec 35:369)
Help on See Also: See Also: Links to other databases for Pezzottaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineral and Gemstone Kingdom
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 09.CJ.05





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