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Mattheddleite Mineral Data
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General Mattheddleite Information
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 Chemical Formula: |
Pb20(SiO4)7(SO4)4Cl4 |
| Composition: |
Molecular Weight = 5,314.65 gm |
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Silicon 3.70 % Si 7.91 % SiO2 |
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Lead 77.97 % Pb 83.99 % PbO |
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Sulfur 2.41 % S 6.03 % SO3 |
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Chlorine 2.67 % Cl 2.67 % Cl |
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- %
Cl -0.60 % -O=Cl2 |
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Oxygen 13.25 % O |
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______ ______ |
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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  |
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Mattheddleite Image |
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Images:
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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 |
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Mattheddleite Crystallography
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| 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 - Dipyramidal H-M Symbol (6/m) Space Group: P 63/m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.988(1), 4.13(0.4), 4.32(0.4), |
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Physical Properties of Mattheddleite
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| 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 |
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Optical Properties of Mattheddleite
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| 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. |
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Calculated Properties of Mattheddleite
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| Electron Density: |
Bulk Density (Electron Density)=5.75 gm/cc
note: Specific Gravity of Mattheddleite =6.88 gm/cc.
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| Fermion Index: |
Fermion Index = 0.17
Boson Index = 0.83 |
| Photoelectric: |
PEMattheddleite =1,432.01 barns/electron
U=PEMattheddleite x rElectron Density=8,238.22 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Mattheddleite is Not Radioactive |
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Mattheddleite Classification
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| Dana Class: |
52.04.09.06 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O |
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(52.04)with cations in [6] and/or > [6] coordination |
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(52.04.09)Silicate apatites |
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52.04.09.00 Ellestadite* Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m |
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52.04.09.01 Britholite-(Ce) (Ce,Ca,Th,La,Nd)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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52.04.09.02 Britholite-(Y) (Y,Ca)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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52.04.09.03 Ellestadite-(F) Ca5(SiO4,PO4,SO4)3(F,OH,Cl) P 63/m 6/m |
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52.04.09.04 Ellestadite-(OH) Ca5(SiO4,SO4)3(OH,Cl,F) P 63/m 6/m |
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52.04.09.05 Ellestadite-(Cl) Ca5(SiO4,PO4,SO4)3(Cl,OH,F) P 63/m 6/m |
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52.04.09.06 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m |
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52.04.09.07 Karnasurtite-(Ce) (Ce,La,Th)(Ti,Nb)(Al,Fe)(Si,P)2O7(OH)4•3(H2O)(?) Unk. Hex |
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52.04.09.08 Fluorbritholite-(Ce) (Ca,Ce,La,Na)5(SiO4,PO4)3(OH,F) P 63/m 6/m |
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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) |
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09.A - Nesosilicates |
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09.AH -Nesosilicates with CO3, SO4, PO4, etc. |
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09.AH.30 Mattheddleite Pb20(SiO4)7(SO4)4Cl4 P 63/m 6/m |
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09.AH.30 Tritomite-(Ce) (Ce,La,Ca,Y,Th)5(Si,B)3(O,OH,F)13 P 63/m 6/m |
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09.AH.30 Tritomite-(Y) (Y,Ca,La,Fe)5(Si,B,Al)3(O,OH,F)13(?) P 63/m 6/m |
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Other Mattheddleite Information
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| 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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Mattheddleite
Pb20(SiO4)7(SO4)4Cl4
Dana No: 52.04.09.06 Strunz No: 09.AH.30
Locality:
Notes:
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