Mattheddleite Mineral Data

General Mattheddleite Information

Chemical Formula: Pb20(SiO4)7(SO4)4Cl4 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 Empirical Formula: Pb₂₀(SiO₄)₇(SO₄)₄Cl₄ Environment: Lining cavities in quartz which contain other oxidized lead minerals. IMA Status: Approved IMA 1987 Locality: From Leadhills, Lanarkshire, Scotland. Link to MinDat.org Location Data. Name Origin: Named for Matthew Forster Heddle (1828-1897), Scottish mineralogist. Name Pronunciation: Mattheddleite + Pronunciation  

Mattheddleite Image

Images:

Mattheddleite 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

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

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Steele I M , Pluth J J , Livingstone A , Mineralogical Magazine , 64 (2000) p.915-921, Crystal structure of mattheddleite: a Pb, S, Si phase with the apatite structure, Locality: Leadhills, Scotland

 

Physical Properties of Mattheddleite

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

Optical Properties of Mattheddleite

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

Calculated Properties of Mattheddleite

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

Mattheddleite Classification

Dana Class: 52.04.09.06 (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  

52.04.09.00 Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

 

52.04.09.01 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

 

52.04.09.02 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

 

52.04.09.03 Ellestadite-(F) Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 6₃/m 6/m

 

52.04.09.04 Ellestadite-(OH) Ca5(SiO4,SO4)3(OH,Cl,F) P 6₃/m 6/m

 

52.04.09.05 Ellestadite-(Cl) Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 6₃/m 6/m

 

52.04.09.06 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 6₃/m 6/m

 

52.04.09.07 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex

 

52.04.09.08 Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 6₃/m 6/m

 

52.04.09.09 Fluorcalciobritholite! (Ca,REE)5[(Si,P)O4]3F P 6₃/m 6/m

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

References: NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.73,p929,1988) OPTIC PROP.(Am.Min.,Vol.73,p929,1988) 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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