Matlockite Mineral Data

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.

Name Pronunciation:

Matlockite + Pronunciation

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

Diaphaneity:

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:

Non-Fluorescent.

Luster:

Adamantine - Pearly

Streak:

white

Optical Properties of Matlockite

Dichroism (e):

colorless.

Dichroism (w):

colorless.

Optical Data:

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

Calculated Properties of Matlockite

Electron Density:

Bulk Density (Electron Density)=5.86 gm/cc
note: Specific Gravity of Matlockite =7.10 gm/cc.

Fermion Index:

Fermion Index = 0.17
Boson Index = 0.83

Photoelectric:

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

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Matlockite is Not Radioactive

Matlockite Classification

Dana Class:

09.02.11.01 (09)Anhydrous and Hydrated Halides

(09.02)where A (X)2

(09.02.11)Matlockite Group

09.02.11.01 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m

09.02.11.02 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m

09.02.11.03 Zhangpeishanite! BaFCl P 4/mmm 4mm

Strunz Class:

03.DC.25 03 - HALIDES

03.D - Oxyhalides, Hydroxyhalides and Related Double Halides

03.DC -With Pb (As,Sb,Bi), without Cu

03.DC.25 Bismoclite BiOCl P 4/nmm 4/m 2/m 2/m

03.DC.25 Daubreeite BiO(OH,Cl) P 4/nmm 4/m 2/m 2/m

03.DC.25 Matlockite PbFCl P 4/nmm 4/m 2/m 2/m

03.DC.25 Rorisite (Ca,Mg)FCl P 4/nmm 4/m 2/m 2/m

03.DC.25 Zavaritskite BiOF P 4/nmm 4/m 2/m 2/m

03.DC.25 Zhangpeishanite! BaFCl P 4/mmm 4mm

Other Matlockite Information

References:

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

See Also:

Links to other databases for Matlockite :
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
15 - WWW-MINCRYST

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Ask about Matlockite here :
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Print or Cut-and-Paste your Matlockite Specimen Label here :

Matlockite

PbFCl
Dana No: 09.02.11.01 Strunz No: 03.DC.25
Locality:

Notes: