Melanotekite Mineral Data (original) (raw)

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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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 - DisphenoidalH-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),

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| | Dorsam G , Liebscher A , Wunder B , Franz G , American Mineralogist , 93 (2008) p.573-583, Crystal structures of synthetic melanotekite (Pb2Fe2Si2O9), kentrolite, (Pb2Mn2Si2O9), and the aluminum analogue (Pb2Al2Si2O9), Locality: synthetic | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |

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:

56.02.10.01 (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

56.02.10.01 Melanotekite Pb2Fe2Si2O9 C 2221 2 2 2

56.02.10.02 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
15 - WWW-MINCRYST

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Ask about Melanotekite here :
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Print or Cut-and-Paste your Melanotekite Specimen Label here :

Melanotekite

Pb2Fe+++2Si2O9
Dana No: 56.02.10.01 Strunz No: 09.BE.80
Locality:

Notes: