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Artroeite

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Formula:
Pb[AlF3(OH)2]
System:
Triclinic
Colour:
Colourless
Lustre:
Vitreous
Hardness:
Name:
For Dr. Arthur Roe (1912-1993), American chemist and collector of microscopic minerals, of Tucson, Arizona, USA.
An aluminium complex salt mineral. Structurally related to gearksutite.

Classification of Artroeite

Approved 1993
3.CC.15

3 : HALIDES
C : Complex halides
C : Soro-aluminofluorides
11.6.18.1

11 : HALIDE COMPLEXES
6 : Aluminofluorides - Isolated Octahedra
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First Recorded Occurrence of Artroeite

General Appearance of First Recorded Material:
Bladed, tabular crystals to 1 mm
Place of Conservation of First Recorded Material:
Natural History Museum, Los Angeles, California, USA (No. 39338)
Year of Discovery:
1993
Geological Setting of First Recorded Material:
Oxidized zone of an epithermal Cu-Pb-Ag deposit
Associated Minerals at First Recorded Locality:

Physical Properties of Artroeite

Vitreous
Diaphaneity (Transparency):
Translucent
Colour:
Colourless
Streak:
White
Hardness (Mohs):
Tenacity:
Brittle
Cleavage:
Perfect
on {100}, good on {010}
Fracture:
Conchoidal
Density:
5.36 g/cm3 (Measured)    5.43 g/cm3 (Calculated)

Crystallography of Artroeite

Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 6.27Å, b = 6.821Å, c = 5.057Å
α = 90.68°, β = 107.69°, γ = 104.46°
Ratio:
a:b:c = 0.919 : 1 : 0.741
Z:
2
Morphology:
Crystals bladed, flat tabular on {10_1}, elongated along [010], with forms {100}, {010}, {001}, {10_1}, {011}, {11_1} and {121}
Twinning:
Common, by rotation about [010] with composition plane {100}
X-Ray Powder Diffraction Data:
d-spacingIntensity
4.42 (100)
2.595 (70)
2.190 (65)
2.030 (50)
3.221 (40)
2.015 (40)
4.05 (35)
Comments:
Recorded on material from Grand Reef Mine, Arizona, USA

Optical Data of Artroeite

Type:
Biaxial (-)
RI values:
nα = 1.629 nβ = 1.682 nγ = 1.691
2V:
Measured: 41° to 42°, Calculated: 42°
Max Birefringence:
δ = 0.062
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
r > v, strong

Chemical Properties of Artroeite

Formula:
Pb[AlF3(OH)2]
Essential elements:
All elements listed in formula:
Analytical Data:
Averages of ten electron microprobe analyses of type material; water content determined by thermogravimetry
PbO (67.5)
Al2O3 (15.6)
F (16.1)
H2O (6.0)
- O = F2 (6.8)

sum 98.4 wt.-%
Empirical Formula:
Pb1.00Al1.01F2.80(OH)2.20

Relationship of Artroeite to other Species

3.CC.05GearksutiteCa[Al(F,OH)5(H2O)]
3.CC.10AcuminiteSr[AlF4(OH)(H2O)]
3.CC.10TikhonenkoviteSr[AlF4(OH)(H2O)]
3.CC.20CalcjarliteNa(Ca,Sr)3Al3(OH)2F14
3.CC.20JarliteNa(Sr,Na)7MgAl6F32(OH,H2O)2
3.CC.20JørgenseniteNa2(Sr,Ba)14Na2Al12F64(OH,F)4

Other Names for Artroeite

Name in Other Languages:
German:Artroeit
Spanish:Artroeita

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 Artroeite

Reference List:
Kampf, A. R. and Foord, E. E. (1995): Artroeite, PbAlF3(OH)2, a new mineral from the Grand Reef mine, Graham Co., Arizona: description and crystal structure. American Mineralogist 80, 179-183.

Kampf, A. R. and Foord, E. E. (1996): Calcioaravaipaite, a new mineral, and associated lead fluoride minerals from the Grand Reef mine, Graham County, Arizona. Mineralogical Record 27, 293-300.

Anthony, J. W. et al. (1997): Handbook of Mineralogy, Vol. 3, 25

Internet Links for Artroeite

Localities for Artroeite

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.
Italy
 
  • Campania
    • Naples Province
      • Somma-Vesuvius Complex
Enrico Bonacina
Campostrini, I., Gramaccioli, C. (2005): Artroeite del Monte Somma-Vesuvio: secondo ritrovamento mondiale. Riv. Mineral. Ital., 29, 1: 50-52. ; M. Russo & I. Campostrini (2011): Ammineite, matlockite and post 1944 eruption fumarolic minerals at Vesuvius. Plinius 37, 312.
USA
 
  • Arizona
    • Graham Co.
      • Aravaipa District
        • Santa Teresa Mts
          • Klondyke
            • Grand Reef Mountain
              • Laurel Canyon
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 120-121; Kampf, A.R. & E.E. Foord (1995), Artroeite, PbAlF3(OH)2, a new mineral from the Grand Reef mine, Graham Co., AZ: Description and crystal structure, Am.Min.: 80: 179-183; Min.Rec.: 27:293-300.
Mineral and/or Locality  
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