Ludlockite (original) (raw)
A valid IMA mineral species
About LudlockiteHide
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Colour:
Orange Red, orange brown
Specific Gravity:
4.33 - 4.40
Name:
Named for Frederick Ludlow Smith III (13 August 1939 - 20 December 2014) and Charles Locke Key (1935-2021), mineral dealers who discovered the mineral and provided the first specimens for study (Frederick Ludlow Smith and Charles Locke Key). Mr. Key also has the mineral keyite named after him.
Note: "ludlockite" from Zarehehuran, Takap, Takht-e-Suleiman massif, West Azerbaijan Province, Iran, turned out to be the new mineral daliranite.
Visually similar to karibibite.
Unique IdentifiersHide
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Long-form identifier:
mindat:1:1:2453:8
007f2011-1d8a-49a9-84f3-3b5f063b0a8b
IMA Classification of LudlockiteHide
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Type description reference:
Classification of LudlockiteHide
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4.JA.45
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
A : Arsenites, antimonites, bismuthites; without additional anions, without H2O
45.1.14.1
45 : ACID AND NORMAL ANTIMONITES AND ARSENITES
1 : Miscellaneous
20.5.10
20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and 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 |
|---|---|---|
| Ldl | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of LudlockiteHide
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Colour:
Orange Red, orange brown
Cleavage:
Perfect
{011}, {0kl}
Density:
4.33 - 4.40 g/cm3 (Measured) 4.58 g/cm3 (Calculated)
Optical Data of LudlockiteHide
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RI values:
_n_α = 1.960 _n_β = 2.055 _n_γ = 2.110
δ = 0.150
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Comments:
X yellow; Y deep yellow; Z orange yellow
Chemistry of LudlockiteHide
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Mindat Formula:
PbFe3+4As3+10O22
Crystallography of LudlockiteHide
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Class (H-M):
1 - Pinacoidal
Cell Parameters:
a = 10.41 Å, b = 11.95 Å, c = 9.86 Å
α = 113.9°, β = 99.7°, γ = 82.7°
Ratio:
a:b:c = 0.871 : 1 : 0.825
Unit Cell V:
1,103.02 ų (Calculated from Unit Cell)
Morphology:
Hair-like crystals
Twinning:
Lamellar twinning on {011}, common.
Crystal StructureHide
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| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0005479 | Ludlockite | Cooper M A, Hawthorne F C (1996) The crystal structure of ludlockite, PbFe4As10O22, the mineral with pentameric arsenite groups and orange hair The Canadian Mineralogist 34 79-89 |  |
1996 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder DiffractionHide
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Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 10.90 Å | (60) |
| 8.81 Å | (100) |
| 4.74 Å | (60) |
| 4.47 Å | (60) |
| 3.330 Å | (70) |
| 3.160 Å | (70) |
| 2.935 Å | (90) |
| 2.863 Å | (70) |
Geological EnvironmentHide
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Type Occurrence of LudlockiteHide
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Place of Conservation of Type Material:
The Natural History Museum, London, England, 1969, 215 and 216; Harvard University, Cambridge, Massachusetts, USA, 127927.
Reference:
Davis, R.J., Embrey, P.G., Hey, M.H. (1970) Ludlockite: A new arsenate mineral. Mineralogical Society of Japan Special Paper 1: 264-264.
Synonyms of LudlockiteHide
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Other Language Names for LudlockiteHide
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Common AssociatesHide
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Associated Minerals Based on Photo Data:
Related Minerals - Strunz-mindat GroupingHide
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Fluorescence of LudlockiteHide
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Other InformationHide
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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 LudlockiteHide
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References for LudlockiteHide
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Localities for LudlockiteHide
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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.