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Pharmacoalumite

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Formula:
KAl4(AsO4)3(OH)4 · 6.5H2O
System:
Isometric
Colour:
White, pale yellow
Hardness:
Name:
Originally named 'Alumopharmacosiderite' in 1981 by Karl Schmetzer, Wolfgang Horn, and Hermann Bank in allusion to its composition, containing ALUMinium, and its relationship to Pharmacosiderite.

Renamed to Pharmacoalumite by Rumsey et al. 2010.
Pharmacoalumite Group.
The Al analogue of pharmacosiderite.

The type material was found on a museum specimen associated with other oxidized arsenates.

Classification of Pharmacoalumite

Approved 1980
8.DK.12

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
K : With large and medium-sized cations, (OH, etc.):RO4 > 1:1 and < 2:1
42.8.1b.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : (AB)5(XO4)3Zq·xH2O
20.4.3

20 : Arsenates (also arsenates with phosphate, but without other anions)
4 : Arsenates of Group III metals (Al, rare earths)
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http://www.mindat.org/min-158.html
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Type Occurrence of Pharmacoalumite

Place of Conservation of Type Material:
U.S. National Museum of Natural History, Washington, D.C., USA: #149527.
Year of Discovery:
1980
Geological Setting of Type Material:
With other oxidized arsenates in a polymetallic deposit.
Associated Minerals at Type Locality:

Physical Properties of Pharmacoalumite

Sub-Vitreous, Waxy, Dull
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
White, pale yellow
Streak:
White
Hardness (Mohs):
Comment:
By analogy with pharmacosiderite
Tenacity:
Brittle
Density:
2.676 g/cm3 (Calculated)

Crystallography of Pharmacoalumite

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
P4 3m
Space Group Setting:
P4 3m
Cell Parameters:
a = 7.745Å
Unit Cell Volume:
V 464.58 ų (Calculated from Unit Cell)
Z:
1
Morphology:
As fine-grained polycrystalline aggregates. Often in cubic crystals.
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.77 (100)
2.739 (60)
4.48 (50)
3.16 (50)
3.87 (40)
2.335 (40)
2.452 (30)
Comments:
Values obtained on natural material from El Guanaco, Chile.

Optical Data of Pharmacoalumite

Type:
Isotropic
RI values:
n = 1.565
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Low
Pleochroism:
Non-pleochroic

Chemical Properties of Pharmacoalumite

Formula:
KAl4(AsO4)3(OH)4 · 6.5H2O
Essential elements:
All elements listed in formula:

Relationship of Pharmacoalumite to other Species

Other Members of Group:
BariopharmacoalumiteBa0.5Al4(AsO4)3(OH)4 · 4H2O
Hydroniumpharmacoalumite(H3O)Al4(AsO4)3(OH)4·4.5H2O
NatropharmacoalumiteNaAl4(AsO4)3(OH)4 · 4H2O
8.DK.RichelsdorfiteCa2Cu5Sb(AsO4)4(OH)6Cl · 6H2O
8.DK.10BariopharmacosideriteBa0.5Fe43+(AsO4)3(OH)4 · 5H2O
8.DK.10PharmacosideriteKFe43+(AsO4)3(OH)4 · 6-7H2O
8.DK.10Natropharmacosiderite(Na,K)Fe43+(AsO4)3(OH)4 · 6-7H2O
8.DK.10Hydroniumpharmacosiderite(H3O)Fe4(AsO4)3(OH)4 · 4H2O
8.DK.12NatropharmacoalumiteNaAl4(AsO4)3(OH)4 · 4H2O
8.DK.12BariopharmacoalumiteBa0.5Al4(AsO4)3(OH)4 · 4H2O
8.DK.15BurangaiteNaFe2+Al5(PO4)4(OH)6 · 2H2O
8.DK.15DufréniteCa0.5Fe2+Fe53+(PO4)4(OH)6 · 2H2O
8.DK.15NatrodufréniteNaFe2+Fe53+(PO4)4(OH)6 · 2H2O
8.DK.15MatioliiteNaMgAl5(PO4)4(OH)6 · 2H2O
8.DK.15GayiteNaMn2+Fe53+(PO4)4(OH)6 · 2H2O
8.DK.20KidwelliteNaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33
8.DK.25Bleasdaleite(Ca,Fe3+)2Cu5(Bi,Cu)(PO4)4(H2O,OH,Cl)13
8.DK.30Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2O
8.DK.35KrasnoviteBa(Al,Mg)(PO4,CO3)(OH)2 · H2O
20.4.1MansfielditeAlAsO4 · 2H2O
20.4.2BulachiteAl2(AsO4)(OH)3 · 3H2O
20.4.4LuetheiteCu2Al2(AsO4)2(OH)4
20.4.5ArsenogoyaziteSrAl3(AsO4)2(OH)5 · H2O
20.4.6ArsenocrandalliteCaAl3(AsO4)2(OH)5 · H2O
20.4.7Arsenoflorencite-(Ce)CeAl3(AsO4)2(OH)6
20.4.8Arsenoflorencite-(La)LaAl3(AsO4)2(OH)6
20.4.9Arsenoflorencite-(Nd)NdAl3(AsO4)2(OH)6
20.4.10Gerdtremmelite(Zn,Fe)(Al,Fe)2(AsO4)(OH)5
20.4.11Gasparite-(Ce)(Ce,REE)(AsO4)
20.4.12Chernovite-(Y)Y(AsO4)
20.4.13Agardite-(Y)YCu6(AsO4)3(OH)6 · 3H2O
20.4.14Agardite-(La)LaCu6(AsO4)3(OH)6 · 3H2O
20.4.15GoudeyiteAlCu6(AsO4)3(OH)6 · 3H2O
20.4.16Retzian-(Ce)Mn22+Ce(AsO4)(OH)4
20.4.17Retzian-(La)(Mn2+,Mg)2(La,Ce,Nd)(AsO4)(OH)4
20.4.18Retzian-(Nd)Mn22+(Nd,Ce,La)(AsO4)(OH)4

Other Names for Pharmacoalumite

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 Pharmacoalumite

Reference List:
Schmetzer, K.; Horn, W.; Bank, H. (1981): Alumopharmacosiderite, KAl4[(OH)4|(AsO4)3].6.5 H2O, a new mineral. Neues Jahrbuch für Mineralogie, Monatshefte 1981, 97-102. (in German).

American Mineralogist (1981): 66: 1099.

Rumsey, M.S., Mills, S.J., Spratt, J. (2010): Natropharmacoalumite, NaAl4[(OH)4(AsO4)3].4H2O, a new mineral of the pharmacosiderite supergroup and the renaming of aluminopharmacosiderite to pharmacoalumite. Mineralogical Magazine, 74, 929-936

Internet Links for Pharmacoalumite

Localities for Pharmacoalumite

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.
Chile (TL)
 
  • Antofagasta Region
    • Antofagasta Province
      • Santa Catalina
Neues Jahrb.,Mh.(1981) 97-102
No reference listed
  • Atacama Region
    • Copiapó Province
      • Tierra Amarilla
        • Pampa Larga district
Jesse Crawford collection (mindat foto); Yang, H., Jenkins, R.A., Downs, R.T., Evans, S.H., Tait, K.T. (2011): Rruffite, Ca2Cu(AsO4)2·2H2O,a new member of the roselite group, from Tierra Amarilla, Chile. Canadian Mineralogist, 49, 877-884
France
 
  • Alsace
    • Bas-Rhin
      • Villé Valley
Wittern, Journée: "Mineralien finden in den Vogesen", von Loga (Cologne), 1997
  • Provence-Alpes-Côte d'Azur
    • Var
      • Le Pradet
No reference listed
Germany
 
  • Saxony
    • Erzgebirge
      • Schneeberg District
Lapis 30(7/8):67-68 (2005)
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Agios Konstantinos [St Constantine] (Kamariza)
Möckel, S. (2000): Strashimirit und 11 weitere Neubestimmungen aus Lavrion (GR). Lapis 25 (7-8), 74.
Morocco
 
  • Souss-Massa-Draâ Region
    • Ouarzazate Province
      • Tazenakht
        • Bou Azer District (Bou Azzer District)
          • Aghbar
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68; Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
          • Bou Azer
N. Meisser, J. Brugger (2006): "Bouazzerit und Maghrebit, zwei neue Arsenatmineralien aus dem Revier Bou Azzer, Marokko", Lapis 31(7/8), 69-71; Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
          • Oumlil
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68; Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
          • Tamdrost
Favreau, G., Dietrich, J. E., Meisser, N., Brugger, J., Ait Haddouch, L. & Maacha, L. (2007): Bou Azzer, Morocco. Mineralogical Record 38, 345-407
Favreau, G. and Dietrich, J. E. (2006). Die Mineralien von Bou Azzer. Lapis 31(7/8), 27-68
Spain
 
  • Andalusia
    • Almería
      • Cuevas del Almanzora (Cuevas de Vera)
        • Sierra Almagrera
          • Jaroso Ravine
Robert PECORINI collection
      • Níjar
        • Rodalquilar
PXRD-confirmed 9.2009 C. Rewitzer collection
USA
 
  • California
    • Sierra Co.
      • Antelope Valley
        • Loyalton
Mineralogical Record 24: 381
  • Utah
    • Tooele Co.
      • Deep Creek Mts
Rick Dalrymple Collection
          • Gold Hill
Luigi Chiappino specimen
Mineral and/or Locality  
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