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Genthelvite Mineral Data

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General Genthelvite Information

Help on Chemical  Formula: Chemical Formula: Zn4Be3(SiO4)3S
Help on Composition: Composition: Molecular Weight = 596.91 gm
   Beryllium   4.53 %  Be   12.57 % BeO
   Zinc       43.82 %  Zn   54.54 % ZnO
   Silicon    14.12 %  Si   30.20 % SiO2
   Sulfur      5.37 %  S     5.37 % S2-
                -   %  S    -2.68 % -O=S 
   Oxygen     32.16 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Zn4Be3(SiO4)3S
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1944
Help on Locality: Locality: Cheyenne Canyon, El Paso County, Colorado, USA Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Frederick August Ludwig Karl Genth (1820-1893), German-American mineralogist.
Help on Name Pronunciation: Name Pronunciation: Genthelvite + Pronunciation Say GENTHELVITE
Help on Synonym: Synonym: ICSD 201641
  PDF 38-467
 

Genthelvite Image

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  Genthelvite

Comments: Pyramidal crystals of genthelvite.
Location: Mont St. Hilaire, Quebec, Canada. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Genthelvite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 8.1206, Z = 2; V = 535.51 Den(Calc)= 3.70
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: P 43n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 1.918(1), 2.174(1), 3.33(1),
 

Physical Properties of Genthelvite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blue green, Brown, Colorless, Green, Yellow.
Help on Density: Density: 3.62
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: Phosphorescent fluorescent, Short UV=green, Long UV=green.
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white
 

Optical Properties of Genthelvite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.146 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.122 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2009,KPDmeas= 0.2054,KC= 0.1792
Ncalc = 1.65 - 1.66
Help on Optical Data: Optical Data: Isotropic, n=1.742-1.745.
 

Calculated Properties of Genthelvite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.55 gm/cc
note: Specific Gravity of Genthelvite =3.70 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.07
Boson Index = 0.93
Help on Photoelectric: Photoelectric: PEGenthelvite = 22.74 barns/electron
U=PEGenthelvite x rElectron Density= 80.63 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Genthelvite is Not Radioactive
 

Genthelvite Classification

Help on  Dana Class: Dana Class: 76.02.04.03 (76)Tectosilicate Al-Si Framework
  (76.02)Feldspathoids and related species
  (76.02.04)Helvite group
 
76.02.04.01 Helvite Mn4Be3(SiO4)3S P 43n 4 3m
 
76.02.04.02 Danalite Fe4Be3(SiO4)3S P 43n 4 3m
 
76.02.04.03 Genthelvite Zn4Be3(SiO4)3S P 43n 4 3m
Help on  Strunz Class: Strunz Class: 09.FB.10 09 - SILICATES (Germanates)
  09.F - Tektosilicates without Zeolitic H2O
  09.FB -Tektosilicates with additional anions
 
09.FB.10 Bicchulite Ca2Al2SiO6(OH)2 I 43m 4 3m
 
09.FB.10 Danalite Fe4Be3(SiO4)3S P 43n 4 3m
 
09.FB.10 Hauyne (Na,Ca)4-8Al6Si6(O,S)24(SO4,Cl)1-2 P 43n 4 3m
 
09.FB.10 Genthelvite Zn4Be3(SiO4)3S P 43n 4 3m
 
09.FB.10 Helvite Mn4Be3(SiO4)3S P 43n 4 3m
 
09.FB.10 Lazurite Na3Ca(Al3Si3O12)S P 43n 4 3m
 
09.FB.10 Kamaishilite Ca2Al2SiO6(OH)2 I-lattice Tetra
 
09.FB.10 Nosean Na8Al6Si6O24(SO4) P 43m 4 3m
 
09.FB.10 Sodalite Na8Al6Si6O24Cl2 P 43n 4 3m
 
09.FB.10 Tugtupite Na4AlBeSi4O12Cl I 4 4
 
09.FB.10 Tsaregorodtsevite N(CH3)4AlSi5O12 I 222 2 2 2
 

Other Genthelvite Information

Help on References: References: PHYS. PROP.(Enc. of Minerals,2nd ed.,1990;www.saint-hilaire.ca) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Genthelvite :
1 - Alkali-Nuts(English)
2 - Alkali-Nuts(Francais)
3 - Am. Min. Crystal Structure Database
4 - Athena
5 - CalTech Mineral Spectroscopy
6 - EUROmin Project
7 - Ecole des Mines de Paris
8 - Franklin Minerals(Dunn)
9 - GeoScienceWorld
10 - Google Images
11 - Google Scholar
12 - Handbook of Mineralogy (MinSocAm)
13 - Handbook of Mineralogy (UofA)
14 - MinDAT
15 - Mineralienatlas (Deutsch)
16 - Online Mineral Museum
17 - QUT Mineral Atlas
18 - Ruff.Info
19 - WWW-MINCRYST

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

Genthelvite

Zn4Be3(SiO4)3S
Dana No: 76.02.04.03 Strunz No: 09.FB.10
Locality:

 

Notes:

 

 
   
 


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