Helvite Mineral Data

Helvite Mineral Data
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General Helvite Information

Help on Chemical Formula: Chemical Formula: Mn4Be3(SiO4)3S
Help on Composition: Composition: Molecular Weight = 555.10 gm
   Manganese  39.59 %  Mn   51.12 % MnO
   Beryllium   4.87 %  Be   13.52 % BeO
   Silicon    15.18 %  Si   32.47 % SiO2
   Sulfur      5.78 %  S     5.78 % S2-
                -   %  S    -2.88 % -O=S 
   Oxygen     34.59 %  O
             ______        ______ 
             100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Mn2+4Be3(SiO4)3S
Help on Environment: Environment: Found in skarns, pegmatites, and hydrothermally altered rocks.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1817
Help on Locality: Locality: Schwarzenberg and Breitenbrunn, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek helios - "sun."
Help on Name Pronunciation: Name Pronunciation: Helvite Say HELVITE
 

Helvite Image

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Helvite   Rhodochrosite

Comments: Yellow crystals of helvite on quartz and pink rhodochrosite.
Location: Galerie Elisabeth, Cavnic, Maramures, Romaina. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals
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Helvite

Comments: Large (for the species), triangular yellowish creamy colored crystals of helvite on white, albite matrix.
Location: Navegador mine, Conselheiro Pena, Minas Gerais, Brazil. Scale: Crystal size 0.7 x 0.7 cm.
© Fabre Minerals

Helvite Crystallography
Help on Cell Dimensions: Cell Dimensions: a = 8.294, Z = 2; V = 570.55 Den(Calc)= 3.23
Help on Crystal System: Crystal System: Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43n
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.386(1), 1.9549(0.34), 2.623(0.12),
Click Here for Large Helvite Structure Window Crystal Structure:

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Hassan I , Grundy H D , American Mineralogist , 70 (1985) p.186-192, The crystal structures of helvite group minerals, (MnFeZn)8(Be6Si6O24)S2

View Additional jPOWD Structure files for Helvite
[1] [2] [3] [4] [5] [6]
 

Physical Properties of Helvite

Help on Cleavage: Cleavage: {111} Indistinct, {111} Indistinct, {111} Indistinct
Help on Color: Color: Brown, Brownish yellow, Gray, Yellow, Yellow green.
Help on Density: Density: 3.16 - 3.36, Average = 3.26
Help on Diaphaneity: Diaphaneity: Translucent to opaque
Help on Fracture: Fracture: Brittle - Generally displayed by glasses and most non-metallic minerals.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 6-6.5 - Orthoclase-Pyrite
Help on Luminescence: Luminescence: Fluorescent, Short UV=deep red, Long UV=deep red.
Help on Luster: Luster: Vitreous - Resinous
Help on Streak: Streak: grayish white
 

Optical Properties of Helvite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.127 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.138 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2283,KPDmeas= 0.2262,KC= 0.2007
Ncalc = 1.63 - 1.67
Help on Optical Data: Optical Data: Isotropic, n=1.728-1.747.
 

Calculated Properties of Helvite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Helvite =3.26 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.05
Boson Index = 0.95
Help on Photoelectric: Photoelectric: PEHelvite = 11.15 barns/electron
U=PEHelvite x rElectron Density= 34.82 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Helvite is Not Radioactive
 

Helvite Classification
Help on Dana Class: Dana Class: 76.02.04.01 (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 Helvite Information
Help on References: References: NAME( Duda&Rejl90) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Helvite :
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 - Google Images
9 - Google Scholar
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - MinMax(Deutsch)
13 - MinMax(English)
14 - Mineralienatlas (Deutsch)
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST

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

Helvite

Mn4Be3(SiO4)3S
Dana No: 76.02.04.01 Strunz No: 09.FB.10
Locality:

 

Notes: