Mineralogy Database

Melanotekite Mineral Data

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General Melanotekite Information

Help on Chemical  Formula: Chemical Formula: Pb2Fe+++2Si2O9
Help on Composition: Composition: Molecular Weight = 726.26 gm
   Iron     15.38 %  Fe   21.99 % Fe2O3
   Silicon   7.73 %  Si   16.55 % SiO2
   Lead     57.06 %  Pb   61.47 % PbO
   Oxygen   19.83 %  O
           ______        ______ 
           100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb2Fe3+2Si2O9
Help on Environment: Environment: Occurs with native lead.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1880
Help on Locality: Locality: Langbanshyttan, Vermland, sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek black and to melt or glass, for the black bead formed under the blowpipe.
Help on Name Pronunciation: Name Pronunciation: Melanotekite + Pronunciation Say MELANOTEKITE

Melanotekite Image

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Comments: Black metallic granular melanotekite with reddish brown andradite.
Location: Langban, Varmland, Sweden. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Melanotekite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.6336:1:0.8936
Help on Cell Dimensions: Cell Dimensions: a = 6.97, b = 11, c = 9.83, Z = 4; V = 753.67 Den(Calc)= 6.40
Help on Crystal System: Crystal System: Orthorhombic - Disphenoidal H-M Symbol (2 2 2) Space Group: C 2221
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.732(1), 2.914(1), 5.523(0.8),

Physical Properties of Melanotekite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: Black, Blackish gray.
Help on Density: Density: 5.73
Help on Diaphaneity: Diaphaneity: Subtranslucent to opaque
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Hardness: Hardness: 6.5 - Pyrite
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Sub Metallic
Help on Streak: Streak: greenish

Optical Properties of Melanotekite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.129 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.011 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1875,KPDmeas= 0.2094,KC= 0.1854
Ncalc = 2.06 - 2.19
Help on Optical Data: Optical Data: Biaxial (+), a=2.12, b=2.17, g=2.31, bire=0.1900

Calculated Properties of Melanotekite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.57 gm/cc
note: Specific Gravity of Melanotekite =6.40 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.13
Boson Index = 0.87
Help on Photoelectric: Photoelectric: PEMelanotekite =1,012.03 barns/electron
U=PEMelanotekite x rElectron Density=5,636.38 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Melanotekite is Not Radioactive

Melanotekite Classification

Help on  Dana Class: Dana Class: (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O
  (56.02)with cations in [4] and/or >[4] coordination
  (56.02.10)Melanotekite group Melanotekite Pb2Fe2Si2O9 C 2221 2 2 2 Kentrolite Pb2Mn2Si2O9 P bcn 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 09.BE.80 09 - SILICATES (Germanates)
  09.B - Sorosilicates
  09.BE -Si2O7 groups with additional anions;
09.BE.80 Kentrolite Pb2Mn2Si2O9 P bcn 2/m 2/m 2/m
09.BE.80 Melanotekite Pb2Fe2Si2O9 C 2221 2 2 2

Other Melanotekite Information

Help on References: References: NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
Help on See Also: See Also: Links to other databases for Melanotekite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 09.BE.80





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