Aheylite Mineral Data

Aheylite Mineral Data +

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General Aheylite Information

Chemical Formula:

(Fe++,Zn)Al6(PO4)4(OH)8·4(H2O)

Composition:

Molecular Weight = 806.08 gm

Aluminum 20.08 % Al 37.95 % Al₂O₃

Zinc 3.24 % Zn 4.04 % ZnO

Iron 3.46 % Fe 4.46 % FeO

Phosphorus 15.37 % P 35.22 % P₂O₅

Hydrogen 2.06 % H 18.44 % H₂O

Oxygen 55.77 % O

______ ______

100.00 % 100.10 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺_0.5Zn_0.4Al₆(PO₄)_3.7(PO₃OH)_0.3(OH)₈·4.1(H₂O)

Environment:

Late stage hydrothermal mineral in a base-metal tin deposit.

IMA Status:

Approved IMA 1986

Locality:

Huanuni mine, Mina Flores Mountain, Huanuni district, Bolivia. Link to MinDat.org Location Data.

Name Origin:

Named for Allen V. Heyl (1918-), economic geologist, U. S. Geological Survey.

Aheylite Image

Images:

Aheylite

Comments: Colorless radiating spray of aheylite crystals.
Location: Huanuni, Bolivia. Scale: Picture size 3 mm.
© Thomas Witzke / Abraxas-Verlag

Aheylite Crystallography

Axial Ratios:

a:b:c =0.7477:1:0.7707

Cell Dimensions:

a = 7.4, b = 9.896, c = 7.627, Z = 1; alpha = 110.87°, beta = 115°, gamma = 69.96° V = 444.35 Den(Calc)= 3.01

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.67(1), 2.888(0.67), 6.146(0.43),

Physical Properties of Aheylite

Cleavage:

[???] Good

Color:

Blue green.

Density:

2.85

Diaphaniety:

Transparent

Fracture:

Hackly - Jagged, torn surfaces, (e.g. fractured metals).

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Botryoidal - "Grape-like" rounded forms (e.g.. malachite).

Habit:

Felted - Occurs as minute crystalling aggregates with the form of felt material.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Vitreous - Dull

Streak:

greenish white

Optical Properties of Aheylite

Gladstone-Dale:

CI meas= -0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2093,KPDmeas= 0.2211,KC= 0.2204

Optical Data:

Biaxial (+), b=1.63

Calculated Properties of Aheylite

Electron Density:

r_electron=2.86 gm/cc
note: r_Aheylite=2.85 gm/cc.

Fermion Index

Fermion Index = 0.00233
Boson Index = 0.99767

Photoelectric:

PE_Aheylite= 3.92 barns/electron
U=PE_Aheylite x r_electron= 11.20 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Aheylite is Not Radioactive

Aheylite Classification

Dana Class:

42.9.3.5 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.9)where (A)3 (XO4)2 Zq · x(H2O)

(42.9.3)Dana Group

42.9.3.1 Turquoise CuAl6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.2 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8·4-5(H2O) P1 1

42.9.3.3 Faustite (Zn,Cu)Al6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.4 Chalcosiderite CuFe6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.5 Aheylite (Fe,Zn)Al6(PO4)4(OH)8·4(H2O) P1 1

42.9.3.6 Planerite Al6(PO4)2(PO3OH)2(OH)8·4(H2O) P1 1

Strunz Class:

VII/D.15-30 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.15 - Turquoise group

VII/D.15-10 Planerite Al6(PO4)2(PO3OH)2(OH)8·4(H2O) P1 1

VII/D.15-20 Coeruleolactite (Ca,Cu)Al6(PO4)4(OH)8·4-5(H2O) P1 1

VII/D.15-30 Aheylite (Fe,Zn)Al6(PO4)4(OH)8·4(H2O) P1 1

VII/D.15-40 Turquoise CuAl6(PO4)4(OH)8·4(H2O) P1 1

VII/D.15-50 Faustite (Zn,Cu)Al6(PO4)4(OH)8·4(H2O) P1 1

VII/D.15-60 Chalcosiderite CuFe6(PO4)4(OH)8·4(H2O) P1 1

Other Aheylite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(37th List of New Min.,Min. Mag.,1996) OPTIC PROP.(AntBidBlaNic4)

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Aheylite

(Fe++,Zn)Al6(PO4)4(OH)8·4(H2O)
Dana No: 42.9.3.5 Strunz No: VII/D.15-30
Locality:

Notes: