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Aheylite

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Allen V.Heyl
Formula:
(Fe2+,Zn)Al6(PO4)4(OH)8 · 4H2O
System:
Triclinic
Colour:
Very pale blue, pale ...
Hardness:
5 - 5½
Member of:
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:
Light blue crystals in dense clusters.

Classification of Aheylite

Approved 1984
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
42.9.3.5

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

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

Year of Discovery:
1984
Geological Setting of Type Material:
A late stage hydrothermal mineral in a base-metal-tin deposit

Physical Properties of Aheylite

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:
3.22 g/cm3 (Measured)    3.26 g/cm3 (Calculated)

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
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 Data:
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:
(Fe2+,Zn)Al6(PO4)4(OH)8 · 4H2O
Essential elements:
All elements listed in formula:

Relationship of Aheylite to other Species

Member of:
Other Members of Group:
ChalcosideriteCu(Fe3+,Al)6(PO4)4(OH)8 · 4H2O
Faustite(Zn,Cu)Al6(PO4)4(OH)8 · 4H2O
PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2O
TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
8.DD.05ChenevixiteCu2Fe23+(AsO4)2(OH)4
8.DD.05LuetheiteCu2Al2(AsO4)2(OH)4
8.DD.10Akrochordite(Mn2+,Mg)5(AsO4)2(OH)4 · 4H2O
8.DD.10GuanacoiteCu2Mg3(AsO4)2(OH)4 · 4H2O
8.DD.15ChalcosideriteCu(Fe3+,Al)6(PO4)4(OH)8 · 4H2O
8.DD.15Faustite(Zn,Cu)Al6(PO4)4(OH)8 · 4H2O
8.DD.15PlaneriteAl6(PO4)2(HPO4)2(OH)8 · 4 H2O
8.DD.15TurquoiseCu(Al,Fe3+)6(PO4)4(OH)8 · 4H2O
8.DD.15AfmiteAl3(OH)4(H2O)3(PO4)(PO3OH) · H2O
8.DD.20Childrenite(Fe2+,Mn2+)Al(PO4)(OH)2 · H2O
8.DD.20Eosphorite(Mn2+,Fe2+)Al(PO4)(OH)2 · H2O
8.DD.20Ernstite(Mn2+,Fe3+)Al(PO4)(OH,O)2 · H2O
19.6.1TarbuttiteZn2(PO4)(OH)
19.6.2SpenceriteZn4(PO4)2(OH)2 · 3H2O
19.6.3HopeiteZn3(PO4)2 · 4H2O
19.6.4ParahopeiteZn3(PO4)2 · 4H2O
19.6.5Veszelyite(Cu,Zn)2Zn(PO4)2 · 2H2O
19.6.6Kipushite(Cu,Zn)5Zn(PO4)2(OH)6 · H2O
19.6.7ScholziteCaZn2(PO4)2 · 2H2O
19.6.8ParascholziteCaZn2(PO4)2 · 2H2O
19.6.9EhrleiteCa4Be3Zn2(PO4)6 · 9H2O
19.6.10Faustite(Zn,Cu)Al6(PO4)4(OH)8 · 4H2O
19.6.12JungiteCa2Zn4Fe83+(PO4)9(OH)9 · 16H2O
19.6.13SchooneriteZnMn2+Fe22+Fe3+(PO4)3(OH)2 · 9H2O
19.6.14PhosphophylliteZn2Fe(PO4)2 · 4H2O

Other Names for Aheylite

Name in Other Languages:
Czech:Aheylit
German:Aheylit
Italian:Aheylite
Latvian:Aheilīts
Spanish:Aheylita

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 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

Localities for Aheylite

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.
Australia
 
  • Western Australia
    • Ashburton Shire
[MinRec 24:203]
Mineralogical Record 24,203-216,218.
Bolivia (TL)
 
  • 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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