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Mattheddleite Mineral Data

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General Mattheddleite Information

Help on Chemical  Formula: Chemical Formula: Pb20(SiO4)7(SO4)4Cl4
Help on Composition: Composition: Molecular Weight = 5,314.65 gm
   Silicon    3.70 %  Si    7.91 % SiO2
   Lead      77.97 %  Pb   83.99 % PbO
   Sulfur     2.41 %  S     6.03 % SO3
   Chlorine   2.67 %  Cl    2.67 % Cl
               -   %   Cl   -0.60 % -O=Cl2   
   Oxygen    13.25 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Pb20(SiO4)7(SO4)4Cl4
Help on Environment: Environment: Lining cavities in quartz which contain other oxidized lead minerals.
Help on IMA Status: IMA Status: Approved IMA 1987
Help on Locality: Locality: From Leadhills, Lanarkshire, Scotland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Matthew Forster Heddle (1828-1897), Scottish mineralogist.
Help on Name Pronunciation: Name Pronunciation: Mattheddleite + Pronunciation Say MATTHEDDLEITE

Mattheddleite Image

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Comments: Radial aggregates of colorless hexagonal microcrystals of mattheddleite with minor blue-green caledonite.
Location: Dry Smale Gill, Roughton Gill, Caldbeck Fells, Cumbria (Cumberland), England, United Kingdom. Scale: See Image.
© Rruff Database

Mattheddleite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.74917
Help on Cell Dimensions: Cell Dimensions: a = 9.963, c = 7.464, Z = 0.5; V = 641.63 Den(Calc)= 6.88
Help on Crystal System: Crystal System: Hexagonal - Dipyramidal H-M Symbol (6/m) Space Group: P 63/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.988(1), 4.13(0.4), 4.32(0.4),

Physical Properties of Mattheddleite

Help on Cleavage: Cleavage: {0001} Indistinct
Help on Color: Color: Colorless, White.
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Habit: Habit: Rosette - Bundled tabular aggregates resembling rose flower petals.
Help on Hardness: Hardness: 3.5-4.5 - Between Copper Penny and Fluorite-Apatite
Help on Luminescence: Luminescence: Fluorescent, Short UV=dull yellow.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Mattheddleite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1465,KC= 0.1473
Ncalc = 2.01
Help on Optical Data: Optical Data: Uniaxial (-), e=1.999, w=2.017, bire=0.0180.

Calculated Properties of Mattheddleite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=5.75 gm/cc
note: Specific Gravity of Mattheddleite =6.88 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.17
Boson Index = 0.83
Help on Photoelectric: Photoelectric: PEMattheddleite =1,432.01 barns/electron
U=PEMattheddleite x rElectron Density=8,238.22 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mattheddleite is Not Radioactive

Mattheddleite Classification

Help on  Dana Class: Dana Class: (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O
  (52.04)with cations in [6] and/or > [6] coordination
  (52.04.09)Silicate apatites Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 63/m 6/m Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 63/m 6/m Ellestadite-(F) Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m Ellestadite-(OH) Ca5(SiO4,SO4)3(OH,Cl,F) P 63/m 6/m Ellestadite-(Cl) Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 63/m 6/m Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 63/m 6/m Fluorcalciobritholite! (Ca,REE)5[(Si,P)O4]3F P 63/m 6/m
Help on  Strunz Class: Strunz Class: 09.AH.30 09 - SILICATES (Germanates)
  09.A - Nesosilicates
  09.AH -Nesosilicates with CO3, SO4, PO4, etc.
09.AH.30 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m
09.AH.30 Tritomite-(Ce) (Ce,La,Ca,Y,Th)5(Si,B)3(O,OH,F)13 P 63/m 6/m
09.AH.30 Tritomite-(Y) (Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13(?) P 63/m 6/m

Other Mattheddleite Information

Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.73,p929,1988) OPTIC PROP.(Am.Min.,Vol.73,p929,1988)
Help on See Also: See Also: Links to other databases for Mattheddleite :
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.AH.30





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