Matlockite Mineral Data + Say MATLOCKITE


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General Matlockite Information

Help on Chemical  Formula: Chemical Formula: PbFCl
Help on Composition: Composition: Molecular Weight = 261.65 gm
   Lead      79.19 %  Pb   85.30 % PbO
   Chlorine  13.55 %  Cl   13.55 % Cl
               -   %  Cl   -3.06 % -O=Cl2
   Fluorine   7.26 %  F     7.26 % F
               -   %  F    -3.06 % -O=F2
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: PbFCl
Help on Environment: Environment: Secondary mineral.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1852
Help on Locality: Locality: Cromford, near Matlock, Derbyshire. Ancient lead slags at Laurium, Greece. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from its locality.
Help on Synonym: Synonym: ICSD 39165
  PDF 26-311
 

Matlockite Image

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Matlockite

Comments: Pale cream colored rosettes of matlockite crystals on matrix.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Matlockite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.76301
Help on Cell Dimensions: Cell Dimensions: a = 4.11, c = 7.246, Z = 2; V = 122.40 Den(Calc)= 7.10
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: P 4/nmm
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.574(1), 2.906(0.45), 3.617(0.4),
Help on Forms: Forms:

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Forms: [ 1 1 1] [ 0 1 1] [ 1 1 0] [ 0 0 1]

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Click Here for Large Matlockite Structure Window Crystal Structure:

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Wyckoff R W G , Crystal Structures , 1 (1963) p.294-296, Second edition. Interscience Publishers, New York, New York, Note: tetragonal PbFCl structure

 

Physical Properties of Matlockite

Help on Cleavage: Cleavage: [001] Perfect
Help on Color: Color: Brownish yellow, Colorless, Green yellow, Dark yellow brown.
Help on Density: Density: 7.12
Help on Diaphaniety: Diaphaniety: Transparent
Help on Fracture: Fracture: Brittle - Uneven - Very brittle fracture producing uneven fragments.
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 2.5-3 - Finger Nail-Calcite
Help on Luminescence: Luminescence: Fluorescent.
Help on Luster: Luster: Adamantine - Pearly
Help on Streak: Streak: white
 

Optical Properties of Matlockite

Help on Dichroism (e): Dichroism (e): colorless.
Help on Dichroism (w): Dichroism (w): colorless.
Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.037 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.034 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1542,KPDmeas= 0.1538,KC= 0.1597
Help on Optical Data: Optical Data: Uniaxial (-), e=2.04, w=2.15, bire=0.1100.
 

Calculated Properties of Matlockite

Help on Electron Density: Electron Density:

relectron=5.86 gm/cc
note: rMatlockite =7.10 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.175
Boson Index = 0.825
Help on Photoelectric: Photoelectric:

PEMatlockite =1,473.63 barns/electron
U=PEMatlockite x relectron=8,637.30 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Matlockite is Not Radioactive

 

Matlockite Classification

Help on  Dana Class: Dana Class: 9.2.11.1 (9)Anhydrous and Hydrated Halides
  (9.2)where A (X)2
  (9.2.11)Dana Group
 
9.2.11.1 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m
 
9.2.11.2 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: III/D.10-60 III - Halogenides
  III/D - Oxi-halogenides with Pb - Bi - Sb and related compounds
  III/D.10 - Cotunnite - Matlockite series
 
III/D.10-10 Fiedlerite Pb3Cl4F(OH)2 P1 1
 
III/D.10-20 Paralaurionite PbCl(OH) C 2/m 2/m
 
III/D.10-30 Laurionite PbCl(OH) Pnam 2/m 2/m 2/m
 
III/D.10-40 Cotunnite PbCl2 Pnam 2/m 2/m 2/m
 
III/D.10-50 Pseudocotunnite K2PbCl4(?) P nma 2/m 2/m 2/m
 
III/D.10-60 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m
 
III/D.10-65 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m
 
III/D.10-70 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m
 
III/D.10-80 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m
 
III/D.10-90 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m
 
III/D.10-140 Symesite! Pb10(SO4)O7Cl4·(H2O) B1 1
 

Other Matlockite 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 Matlockite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 - EUROmin Project 5 -Google Images 6 -Google Scholar 7 -Handbook of Mineralogy (UofA) 8 -MinDAT 9 -MinMax(Deutsch) 10 -MinMax(English) 11 -Mineralienatlas (Deutsch) 12 -QUT Mineral Atlas 13 - WWW-MINCRYST 14 -École des Mines de Paris

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Matlockite

PbFCl
Dana No: 9.2.11.1 Strunz No: III/D.10-60
Locality:

 

Notes:

 

 
   
 
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