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Aheylite

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Formula:
(Fe
2+
 
,Zn)Al
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
System:TriclinicColour:Very pale blue, pale ...
Hardness:5 - 5½
Member of:Turquoise Group
Name:
Named in 1998 by Eugene E. Foord and Joseph E. Taggert in honor of Allen V. Heyl (1918-2008), economic geologist of the U. S. Geological Survey.
Isostructural with:Turquoise


Light blue crystals in dense clusters.

Classification of Aheylite

IMA status:Approved 1984
Strunz 8th edition ID:7/D.15-30
Nickel-Strunz 10th (pending) edition ID:8.DD.15

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
D : With only medium-sized cations, (OH, etc.):RO4= 2:1
Dana 8th edition ID:42.9.3.5

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
9 : (AB)7(XO4)4Zq·xH2O
Hey's CIM Ref.:19.6.11

19 : Phosphates
6 : Phosphates of Zn
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Type Occurrence of Aheylite

Type Locality:Huanuni mine, Huanuni, Dalence Province, Oruro Department, Bolivia
Year of Discovery:1984
Geological Setting of type material:A late stage hydrothermal mineral in a base-metal-tin deposit
Associated Minerals at type locality:
WavelliteVivianiteVarisciteSphaleriteQuartz
PyriteCassiterite

Physical Properties of Aheylite

Lustre:Sub-Vitreous
Diaphaneity (Transparency):Transparent
Colour:Very pale blue, pale green, to blue-green
Streak:greenish white
Hardness (Mohs):5 - 5½
Tenacity:Brittle
Cleavage:Perfect
{001}, also {010} good
Fracture:Hackly
Density (measured):3.22 g/cm3
Density (calculated):3.26 g/cm3

Crystallography of Aheylite

Crystal System:Triclinic
Class (H-M):1 - Pinacoidal
Space Group:P1
Cell Parameters:a = 7.885Å, b = 10.199Å, c = 7.672Å
α = 110.84°, β = 115.12°, γ = 67.51°
Ratio:a:b:c = 0.773 : 1 : 0.752
Unit Cell Volume:V 502.16 ų (Calculated from Unit Cell)
Z:1
Morphology:Dense clusters of crystals ideally displaying typical turquoise group morphology: short prismatic with large {001}, {010}, {1-10}, and {-1-11}.
X-Ray Powder Diffraction:
d-spacingIntensity
6.15 (40)
3.67 (100)
3.44 (40)
3.40 (30)
3.27 (40)
2.91 (30)
2.89 (70)
2.02 (30)

Optical Data of Aheylite

Type:Biaxial (+)
Dispersion:r > v

Chemical Properties of Aheylite

Formula:
(Fe
2+
 
,Zn)Al
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
Simplified for copy/paste:(Fe2+,Zn)Al6(PO4)4(OH)8·4H2O
Essential elements:Al, Fe, H, O, P
All elements listed in formula:Al, Fe, H, O, P, Zn

Relationship of Aheylite to other Species

Member of:Turquoise Group
Other Members of Group:

- +
Chalcosiderite
Cu(Fe
3+
 
,Al)
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
Faustite
(Zn,Cu)Al
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
Planerite
Al
 
6
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
(OH)
 
8
· 4 H
 
2
O
Turquoise
Cu(Al,Fe
3+
 
)
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
Related Minerals - Nickel-Strunz Grouping):

- +
8.DD.05Chenevixite
Cu
 
2
Fe
3+
2
(AsO
 
4
)
 
2
(OH)
 
4
8.DD.05Luetheite
Cu
 
2
Al
 
2
(AsO
 
4
)
 
2
(OH)
 
4
8.DD.10Akrochordite
(Mn
2+
 
,Mg)
 
5
(AsO
 
4
)
 
2
(OH)
 
4
· 4H
 
2
O
8.DD.10Guanacoite
Cu
 
2
Mg
 
3
(AsO
 
4
)
 
2
(OH)
 
4
· 4H
 
2
O
8.DD.15Chalcosiderite
Cu(Fe
3+
 
,Al)
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
8.DD.15Faustite
(Zn,Cu)Al
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
8.DD.15Planerite
Al
 
6
(PO
 
4
)
 
2
(HPO
 
4
)
 
2
(OH)
 
8
· 4 H
 
2
O
8.DD.15Turquoise
Cu(Al,Fe
3+
 
)
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
8.DD.15Afmite
Al
 
3
(OH)
 
4
(H2O)
 
3
(PO
 
4
)(PO
 
3
OH) · H2O
8.DD.20Childrenite
(Fe
2+
 
,Mn
2+
 
)Al(PO
 
4
)(OH)
 
2
· H
 
2
O
8.DD.20Eosphorite
(Mn
2+
 
,Fe
2+
 
)Al(PO
 
4
)(OH)
 
2
· H
 
2
O
8.DD.20Ernstite
(Mn
2+
 
,Fe
3+
 
)Al(PO
 
4
)(OH,O)
 
2
· H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.6.1Tarbuttite
Zn
 
2
(PO
 
4
)(OH)
19.6.2Spencerite
Zn
 
4
(PO
 
4
)
 
2
(OH)
 
2
· 3H
 
2
O
19.6.3Hopeite
Zn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
19.6.4Parahopeite
Zn
 
3
(PO
 
4
)
 
2
· 4H
 
2
O
19.6.5Veszelyite
(Cu,Zn)
 
2
Zn(PO
 
4
)
 
2
· 2H
 
2
O
19.6.6Kipushite
(Cu,Zn)
 
5
Zn(PO
 
4
)
 
2
(OH)
 
6
· H
 
2
O
19.6.7Scholzite
CaZn
 
2
(PO
 
4
)
 
2
· 2H
 
2
O
19.6.8Parascholzite
CaZn
 
2
(PO
 
4
)
 
2
· 2H
 
2
O
19.6.9Ehrleite
Ca
 
4
Be
 
3
Zn
 
2
(PO
 
4
)
 
6
· 9H
 
2
O
19.6.10Faustite
(Zn,Cu)Al
 
6
(PO
 
4
)
 
4
(OH)
 
8
· 4H
 
2
O
19.6.12Jungite
Ca
 
2
Zn
 
4
Fe
3+
8
(PO
 
4
)
 
9
(OH)
 
9
· 16H
 
2
O
19.6.13Schoonerite
ZnMn
2+
 
Fe
2+
2
Fe
3+
 
(PO
 
4
)
 
3
(OH)
 
2
· 9H
 
2
O
19.6.14Phosphophyllite
Zn
 
2
Fe(PO
 
4
)
 
2
· 4H
 
2
O

Other Names for Aheylite

Synonyms:
IMA1984-036
Other Languages:
Czech:Aheylit
German:Aheylit
Italian:Aheylite
Latvian:Aheilīts
Spanish:Aheylita

Other Information

Fluorescence in UV light:Non-fluorescent
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Aheylite

Reference List:

- +
Foord, E.E. & Taggart, J.E. (1998): A reexamination of the turquoise group; the mineral aheylite, planerite (redefined), turquoise and coeruleolactite. Mineralogical Magazine, 62, 93-111.

Internet Links for Aheylite

Search Engines:
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  • External Links:
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  • Look for Aheylite on Wikipedia
  • Look for Aheylite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Aheylite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Aheylite specimens for sale - minfind.com
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  • Localities for Aheylite

    The 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. ? 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.
    Australia
     
    • Western Australia
      • Ashburton Shire
    [MinRec 24:203]
    Mineralogical Record 24,203-216,218.
    Bolivia
     
    • Oruro Department
      • Dalence Province
        • Huanuni
    [MinRec 32:472]
    France
     
    • Auvergne
      • Allier
        • Ébreuil
          • Échassières
    Le Règne Minéral, (33), 5-25.
    UK
     
    • England
      • Cornwall
        • St Austell District
          • Treverbyn
            • Bugle
    Goley, P. and Williams R. (1995) Cornish Mineral Reference Manual. Endsleigh Publications
    Mineral and/or Locality  
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