Mineralogy Database

Stoppaniite Mineral Data

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General Stoppaniite Information

Help on Chemical  Formula: Chemical Formula: (Fe,Al,Mg)4(Na,[ ])2[Be6Si12O36]•2(H2O)
Help on Composition: Composition: Molecular Weight = 1,190.23 gm
   Sodium      1.82 %  Na    2.45 % Na2O
   Magnesium   1.37 %  Mg    2.27 % MgO
   Beryllium   4.54 %  Be   12.61 % BeO
   Aluminum    1.75 %  Al    3.30 % Al2O3
   Iron       10.79 %  Fe   13.88 % FeO
   Silicon    28.32 %  Si   60.58 % SiO2
   Hydrogen    0.34 %  H     3.03 % H2O
   Oxygen     51.08 %  O
             ______        ______ 
             100.00 %       98.11 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe2+2.3Al0.77Mg0.67Na0.94Be6Si12O36•2(H2O)
Help on Environment: Environment: Miarolitic cavities of a volcanic ejectum. The Fe+++ dominant analog of beryl.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: Capranica (Viterbo), Vico volcanic complex, Latium, Italy. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the mineral collector Francesco Saverio Stoppani (1947-).
Help on Synonym: Synonym: ICSD 85697
  IMA1996-008
  PDF 83-1024
 

Stoppaniite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.98576
Help on Cell Dimensions: Cell Dimensions: a = 9.346, c = 9.213, Z = 1; V = 696.92 Den(Calc)= 2.84
Help on Crystal System: Crystal System: Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P 6/mmc
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.278(1)(112), 8.12(0.65)(010), 2.903(0.64)(121),4(0.38)(012), 1.752(0.3)(034), 2.553(0.3)(122),
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Physical Properties of Stoppaniite

Help on Cleavage: Cleavage: {0001} Parting
Help on Color: Color: Light blue.
Help on Density: Density: 2.79
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Euhedral Crystals - Occurs as well-formed crystals showing good external form.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 7.5 - Garnet
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Stoppaniite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.068 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= -0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.219,KPDmeas= 0.2229,KC= 0.2087
Ncalc = 1.58 - 1.59
Help on Optical Data: Optical Data: Uniaxial (-), e=1.619, w=1.625, bire=0.0060.
 

Calculated Properties of Stoppaniite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.81 gm/cc
note: Specific Gravity of Stoppaniite =2.84 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94
Help on Photoelectric: Photoelectric: PEStoppaniite = 4.44 barns/electron
U=PEStoppaniite x rElectron Density= 12.45 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Stoppaniite is Not Radioactive
 

Stoppaniite Classification

Help on  Dana Class: Dana Class: 61.01.01.04 (61)Cyclosilicate Six-Membered Rings
  (61.01)with [Si6O18] rings; possible (OH) and Al substitution
  (61.01.01)Beryl group
 
61.01.01.01 Beryl Be3Al2Si6O18 P 6/mmc 6/m 2/m 2/m
 
61.01.01.02 Bazzite Be3(Sc,Al)2Si6O18 P 6/mcc 6/m 2/m 2/m
 
61.01.01.03 Indialite Mg2Al4Si5O18 P 6/mcc 6/m 2/m 2/m
 
61.01.01.04 Stoppaniite! (Fe,Al,Mg)4(Na,[])2[Be6Si12O36]•2(H2O) P 6/mmc 6/m 2/m 2/m
 
61.01.01.05 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 Stoppaniite Information

Help on References: References: NAME( AmMin, Vol 85, p 1845) PHYS. PROP.(AmMin, Vol 85, p 1845) OPTIC PROP.(Eur.J.Min.,Vol.10,p491-496,1998)
Help on See Also: See Also: Links to other databases for Stoppaniite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - WWW-MINCRYST

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Stoppaniite

(Fe,Al,Mg)4(Na,[ ])2[Be6Si12O36]•2(H2O)
Dana No: 61.01.01.04 Strunz No: 09.CJ.05
Locality:

 

Notes:

 

 
   
 


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