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Natropharmacoalumite

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Formula:
NaAl4(AsO4)3(OH)4 · 4H2O
System:
Isometric
Colour:
colorless
Lustre:
Adamantine, Vitreous
Hardness:
Name:
The new mineral is named natropharmacoalumite, and follows the already established prefix-based nomenclature of the pharmacosiderite supergroup. The name is in allusion to the cation dominance of Na and Al.
Isostructural with:

Classification of Natropharmacoalumite

Approved
Approval Year:
2010
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.2

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

Physical Properties of Natropharmacoalumite

Adamantine, Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
colorless
Streak:
white
Hardness (Mohs):
Hardness (Vickers):
VHN100=267
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
imperfect cleavage on {100}.
Fracture:
Irregular/Uneven
Density:
2.564 g/cm3 (Calculated)

Optical Data of Natropharmacoalumite

Type:
Isotropic
RI values:
n = 1.556
Max Birefringence:
δ = 0.000 - Isotropic minerals have no birefringence
Surface Relief:
Low
Internal Reflections:
white
Comments:
assumed to be anomalously biaxial, anomalous birefringence is typical in members of the pharmacosiderite group

Chemical Properties of Natropharmacoalumite

Formula:
NaAl4(AsO4)3(OH)4 · 4H2O
Elements listed in formula:

Crystallography of Natropharmacoalumite

Crystal System:
Isometric
Class (H-M):
4 3m - Hextetrahedral
Space Group:
P4 3m
Space Group Setting:
P4 3m
Cell Parameters:
a = 7.7280(3) Å
Unit Cell Volume:
V 461.53 ų (Calculated from Unit Cell)
Z:
1
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.759 (100)
4.473 (40)
3.870 (50)
3.459 (6)
3.158 (6)
2.736 (6)
2.446 (9)
2.331 (12)

Type Occurrence of Natropharmacoalumite

General Appearance of Type Material:
intergrown cubic crystals
Place of Conservation of Type Material:
Natural History Museum, London, England, catalog no. BM 2009,161
Geological Setting of Type Material:
Oxidation zone of a gold mine
Associated Minerals at Type Locality:

Relationship of Natropharmacoalumite to other Species

Other Members of Group:
BariopharmacoalumiteBa0.5Al4(AsO4)3(OH)4 · 4H2O
Hydroniumpharmacoalumite(H3O)Al4(AsO4)3(OH)4·4.5H2O
PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2O
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.12PharmacoalumiteKAl4(AsO4)3(OH)4 · 6.5H2O
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

Other Names for Natropharmacoalumite

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 Natropharmacoalumite

Reference List:
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 Natropharmacoalumite

mindat.org URL:
https://www.mindat.org/min-40144.html
Please feel free to link to this page.

Localities for Natropharmacoalumite

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.
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.
Spain (TL)
 
  • Andalusia
    • Almería
      • Níjar
        • Rodalquilar
CNMNC Newsletter, June 2010, 578; Min.Mag, 74,577-579(2010); 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
Mineral and/or Locality  
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