Helvite Mineral Data (original) (raw)
General Helvite Information
Chemical Formula:
Mn4Be3(SiO4)3S
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-
Oxygen 34.59 % O
______ ______
100.00 % 100.00 % = TOTAL OXIDE
Empirical Formula:
Mn2+4Be3(SiO4)3S
Environment:
Found in skarns, pegmatites, and hydrothermally altered rocks.
IMA Status:
Valid Species (Pre-IMA) 1817
Locality:
Schwarzenberg and Breitenbrunn, Germany. Link to MinDat.org Location Data.
Name Origin:
From the Greek helios - "sun."
Name Pronunciation:
Helvite 
Helvite Image
Images:
Images:
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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 |
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Helvite Crystallography
Cell Dimensions:
a = 8.294, Z = 2; V = 570.55 Den(Calc)= 3.23
Crystal System:
Isometric - HextetrahedralH-M Symbol (4 3m) Space Group: P 43n
X Ray Diffraction:
By Intensity(I/Io): 3.386(1), 1.9549(0.34), 2.623(0.12),
Crystal Structure:
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drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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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
Cleavage:
{111} Indistinct, {111} Indistinct, {111} Indistinct
Color:
Brown, Brownish yellow, Gray, Yellow, Yellow green.
Density:
3.16 - 3.36, Average = 3.26
Diaphaneity:
Translucent to opaque
Fracture:
Brittle - Generally displayed by glasses and most non-metallic minerals.
Habit:
Massive - Uniformly indistinguishable crystals forming large masses.
Hardness:
6-6.5 - Orthoclase-Pyrite
Luminescence:
Fluorescent, Short UV=deep red, Long UV=deep red.
Luster:
Vitreous - Resinous
Streak:
grayish white
Optical Properties of Helvite
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
Optical Data:
Isotropic, n=1.728-1.747.
Calculated Properties of Helvite
Electron Density:
Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Helvite =3.26 gm/cc.
Fermion Index:
Fermion Index = 0.05
Boson Index = 0.95
Photoelectric:
PEHelvite = 11.15 barns/electron
U=PEHelvite x rElectron Density= 34.82 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Helvite is Not Radioactive
Helvite Classification
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
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
References:
NAME( Duda&Rejl90) PHYS. PROP.(www.saint-hilaire.ca) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
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 - GeoScienceWorld
9 - Google Images
10 - Google Scholar
11 - Handbook of Mineralogy (UofA)
12 - MinDAT
13 - Mineralienatlas (Deutsch)
14 - Online Mineral Museum
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
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Ask about Helvite 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 Espa�ol
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: