Matlockite (original) (raw)
A valid IMA mineral species - grandfathered
About MatlockiteHide
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Colour:
Colourless, light yellow to light golden-yellow, greenish
Lustre:
Adamantine, Pearly
Crystal System:
Tetragonal
Name:
After the locality near Matlock, Derbyshire, England.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2593:1
8165fc87-9b6a-4ee2-b637-09c32997b9b8
IMA Classification of MatlockiteHide
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Approved, 'Grandfathered' (first described prior to 1959)
Type description reference:
Classification of MatlockiteHide
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3.DC.25
3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
9.2.11.1
9 : NORMAL HALIDES
2 : AX2
8.8.2
8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
8 : Halides of Pb
Mineral SymbolsHide
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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Mtl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of MatlockiteHide
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Pronunciation:
| Play | Recorded by | Country |
|---|---|---|
| Sorry, your browser doesn't support HTML5 audio. | Jolyon Ralph | United Kingdom |
Physical Properties of MatlockiteHide
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Colour:
Colourless, light yellow to light golden-yellow, greenish
Cleavage:
Perfect
On {001}.
Fracture:
Irregular/Uneven, Sub-Conchoidal
Density:
7.12 g/cm3 (Measured) 7.16 g/cm3 (Calculated)
Optical Data of MatlockiteHide
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RI values:
_n_ω = 2.150 _n_ε = 2.040
δ = 0.110
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
Biaxial with small 2V at times, the result of subparallel growth or strain.
Chemistry of MatlockiteHide
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Crystallography of MatlockiteHide
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Crystal System:
Tetragonal
Class (H-M):
4/m m m _(_4/_m_2/_m_2/m ) - Ditetragonal Dipyramidal
Cell Parameters:
a = 4.11 Å, c = 7.23 Å
Unit Cell V:
122.13 ų (Calculated from Unit Cell)
Morphology:
Crystals usually tabular {001}; also as stout pyramidal crystals with smal prism faces. Subparallel aggregates of platy crystals; as hemispherical, rosette-like groups. Massive; coarsely lamellar.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0017948 | Matlockite | Nieuwenkamp W, Bijvoet J (1932) Die Kristallstruktur von Bleifluochlorid Pb F Cl _cod_database_code 1011046 Zeitschrift fur Kristallographie 81 469-473 | 1932 | 0 | 293 | ||
| 0011855 | Matlockite | Wyckoff R W G (1963) Second edition. Interscience Publishers, New York, New York Crystal Structures 1 294-296 | 1963 | 0 | 293 | ||
| 0014434 | Matlockite | Bannister F A, Hey M H (1934) The crystal-structure and optical properties of matlockite (PbFCl) Mineralogical Magazine 23 587-597 | 1934 | Matlock, Derbyshire, England | 0 | 293 | |
| 0014521 | Matlockite | Pasero M, Perchiazzi N (1996) Crystal structure refinement of matlockite Mineralogical Magazine 60 833-836 |  |
1996 | Baratti beach, Tuscany, Italy | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.574 Å | (100) |
| 2.906 Å | (45) |
| 3.617 Å | (40) |
| 2.265 Å | (40) |
| 2.715 Å | (35) |
| 1.781 Å | (25) |
| 2.055 Å | (20) |
Geological EnvironmentHide
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Type Occurrence of MatlockiteHide
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Place of Conservation of Type Material:
Natural History Museum, London, England, 89055.
Associated Minerals at Type Locality:
Reference:
Greg, R.P. (1851) A Description of Matlockite, a New Oxychloride of Lead. The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science: 2: 120-121.
Synonyms of MatlockiteHide
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Other Language Names for MatlockiteHide
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Relationship of Matlockite to other SpeciesHide
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Other Members of this group:
Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Other InformationHide
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Thermal Behaviour:
Melting point 601°.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for MatlockiteHide
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References for MatlockiteHide
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Reference List:
Localities for MatlockiteHide
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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the 
symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
Locality ListHide
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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. 
- Good crystals or important locality for species. 
- World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.