Matlockite Mineral Data

Matlockite Mineral Data +

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General Matlockite Information

Chemical Formula:

PbFCl

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

Empirical Formula:

PbFCl

Environment:

Secondary mineral.

IMA Status:

Valid Species (Pre-IMA) 1852

Locality:

Cromford, near Matlock, Derbyshire. Ancient lead slags at Laurium, Greece. Link to MinDat.org Location Data.

Name Origin:

Named from its locality.

Synonym:

ICSD 39165

PDF 26-311

Matlockite Image

Images:

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

Axial Ratios:

a:c = 1:1.76301

Cell Dimensions:

a = 4.11, c = 7.246, Z = 2; V = 122.40 Den(Calc)= 7.10

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/I_o): 3.574(1), 2.906(0.45), 3.617(0.4),

Forms:

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

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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

Cleavage:

[001] Perfect

Color:

Brownish yellow, Colorless, Green yellow, Dark yellow brown.

Density:

7.12

Diaphaniety:

Transparent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Crystalline - Coarse - Occurs as well-formed coarse sized crystals.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2.5-3 - Finger Nail-Calcite

Luminescence:

Fluorescent.

Luster:

Adamantine - Pearly

Streak:

white

Optical Properties of Matlockite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

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

Optical Data:

Uniaxial (-), e=2.04, w=2.15, bire=0.1100.

Calculated Properties of Matlockite

Electron Density:

r_electron=5.86 gm/cc
note: r_Matlockite=7.10 gm/cc.

Fermion Index

Fermion Index = 0.175
Boson Index = 0.825

Photoelectric:

PE_Matlockite=1,473.63 barns/electron
U=PE_Matlockite x r_electron=8,637.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Matlockite is Not Radioactive

Matlockite Classification

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

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

References:

NAME( Ford32) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Matlockite

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

Notes: