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Ludlockite

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Formula:
PbFe43+As103+O22
System:
Triclinic
Colour:
Orange Red, orange brown
Lustre:
Greasy, Silky
Hardness:
1½ - 2
Name:
Named for mineral dealers Frederick Ludlow Smith III (13 August 1939 - 20 December 2014) and Charles Locke Key (1935-), who discovered the mineral Frederick Ludlow Smith and Charles Locke Key.
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.


Classification of Ludlockite

Approved
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

Physical Properties of Ludlockite

Greasy, Silky
Diaphaneity (Transparency):
Translucent
Colour:
Orange Red, orange brown
Streak:
light brown
Hardness (Mohs):
1½ - 2
Tenacity:
Brittle
Cleavage:
Perfect
{0-11}, {0kl}
Fracture:
None observed
Density:
4.40 g/cm3 (Measured)    4.35 g/cm3 (Calculated)

Optical Data of Ludlockite

Type:
Biaxial (+)
RI values:
nα = 1.960 nβ = 2.055 nγ = 2.110
Birefringence:
0.15
Max Birefringence:
δ = 0.150
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
strong
Pleochroism:
Visible
Comments:
X yellow; Y deep yellow; Z orange yellow

Chemical Properties of Ludlockite

Formula:
PbFe43+As103+O22
Idealised Formula:
(Fe,Pb)As2O6
Elements listed in formula:

Crystallography of Ludlockite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
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 Volume:
V 1,103.02 ų (Calculated from Unit Cell)
Z:
9
Morphology:
Hair-like crystals
X-Ray Powder Diffraction Data:
d-spacingIntensity
10.90 (60)
8.81 (100)
4.74 (60)
4.47 (60)
3.330 (70)
3.160 (70)
2.935 (90)
2.863 (70)
Comments:
29-774

Type Occurrence of Ludlockite

Relationship of Ludlockite to other Species

4.JA.05LeiteiteZn(As2O4)
4.JA.10ReineriteZn3(AsO3)2
4.JA.15KaribibiteFe3+(As3+O2)4(As23+O5)(OH)
4.JA.20KusachiiteCuBi2O4
4.JA.20SchafarzikiteFe2+Sb23+O4
4.JA.20TrippkeiteCu[As2O4]
4.JA.25ApuaniteFe2+Fe43+Sb43+O12S
4.JA.30VersiliaiteFe2Fe4Sb6O16S
4.JA.35SchneiderhöhniteFe2+Fe33+[As5O13]
4.JA.40Zimbabweite(Na,K)2PbAs4(Ta,Nb,Ti)4O18
4.JA.50PaulmooreitePb2[As2O5]
4.JA.55StibivaniteSb2VO5
4.JA.60Chadwickite(UO2)[HAsO3]
20.5.1CafarsiteCa5.9Mn1.7Fe3Ti3(AsO3)12 · 4-5H2O
20.5.2SchultenitePb(HAsO4)
20.5.3DuftitePbCu(AsO4)(OH)
20.5.4BayldonitePbCu3(AsO4)2(OH)2
20.5.5PhilipsbornitePbAl3(AsO4)2(OH)5 · H2O
20.5.6ArsendescloizitePbZn(AsO4)(OH)
20.5.7HelmutwinkleritePb(Zn,Cu)2(AsO4)2 · 2H2O
20.5.8ThometzekitePb(Cu,Zn)2(AsO4,SO4)2 · 2(H2O,OH)
20.5.9Caryinite(Na,Pb)(Ca,Na)CaMn22+(AsO4)3
20.5.11GabrielsonitePbFe(AsO4)(OH)
20.5.12CarminitePbFe23+(AsO4)2(OH)2
20.5.13SegnititePbFe33+(AsO4)2(OH,H2O)6
20.5.14TsumcoritePbZn2(AsO4)2 · 2H2O
20.5.15JamesitePb2Zn(Fe2+,Zn)2Fe43+(AsO4)4(OH)10
20.5.16MawbyitePb(Fe3+,Zn)2(AsO4)2 · 2(OH,H2O)
20.5.17ArsenbrackenbuschitePb2Fe3+(AsO4)2(OH)

Other Names for Ludlockite

Name in Other Languages:

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Ludlockite

Reference List:
American Mineralogist (1972): 57: 1003.

Canadian Mineralogist (1994): 34: 79-89.

Internet Links for Ludlockite

mindat.org URL:
https://www.mindat.org/min-2453.html
Please feel free to link to this page.
Specimens:
The following Ludlockite specimens are currently listed for sale on minfind.com.

Localities for Ludlockite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Austria
 
  • Carinthia
    • Saualpe
      • Bad St Leonhard
        • Kliening
Carinthia II (1999)
Chile
 
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
Confirmed and analysed by PXRD by Dr. Tony Kampf (Curator of NHM of LA - USA)
France
 
  • Auvergne-Rhône-Alpes
    • Loire
      • La Pacaudière
        • Le Crozet
No reference listed
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
Hochleitner, R. (1986): Ludlockit aus den Schlacken von Lavrion. LAPIS 11 (6), 30
        • Lavrion (Laurion; Laurium)
Steve Rust collection
        • Oxygon area
No reference listed
        • Sounion area
Fritz Schreiber collection (PXRD-analysed by Uwe Kolitsch)
        • Thorikos area
Gelaude, Piet, van Kalmthout, Piet and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
        • Vrissaki area
Gelaude, Piet, van Kalmthout, Piet, and Rewitzer, Christian (1996) Laurion: The Minerals in the Ancient Slags, Janssen Print, Nijmegen, The Netherlands
Iran
 
  • West Azarbaijan Province (West Azerbaijan Province)
    • Takab (Takan Tepe)
http://rruff.geo.arizona.edu/doclib/hom/ludlockite.pdf http://www.mindat.org/mesg-14-151189.html
Italy
 
  • Tuscany
    • Livorno Province
      • Campigliese (Campiglia Mountains; Campiglia Ridge)
        • Campiglia Marittima
Int. Assoc. of Collectors of Slag Minerals, 10 (2), 4-6.
        • Sassetta
          • Canina Valley
Jansen, H. & van den Berg, W. (1998): Slakkenmineralen in Toscane (Italië). Gea, no. 4, 109-117 (in Dutch).
      • Piombino
Cerutti, G. and Preite, D. (1995): Mineralien der etruskischen Schlacken von Baratti, Toskana. Lapis, 20 (4), 13-18; 50 (in German).
Japan
 
  • Kyushu Region
    • Oita prefecture
      • Saiki City
Specimens on sale at Osaka show, 2010.
Namibia (TL)
 
  • Otjikoto Region (Oshikoto)
    • Tsumeb
[Nickel & Nichols, 1991 "Mineral Reference Manual": 123; Rocks & Min.: 62:440.
South Africa
 
  • Limpopo Province
    • Sekhukhune District
      • Marble Hall
Robert O. Meyer collection; Dr. Hans Börner collection;
Mineral and/or Locality  
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