Liroconite Mineral Data

Liroconite Mineral Data +

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General Liroconite Information

Chemical Formula:

Cu2Al(AsO4)(OH)4·4(H2O)

Composition:

Molecular Weight = 433.08 gm

Aluminum 6.23 % Al 11.77 % Al₂O₃

Copper 29.35 % Cu 36.73 % CuO

Arsenic 17.30 % As 26.54 % As₂O₅

Hydrogen 2.79 % H 24.96 % H₂O

Oxygen 44.33 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Cu₂Al(AsO₄)(OH)₄·4(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1825

Locality:

Wheal Gorland, Gwennap, Cornwall, England, UK Link to MinDat.org Location Data.

Name Origin:

From the Greek, liros - "pale" and konia - "powder."

Synonym:

ICSD 69540

PDF 12-526

Liroconite Image

Images:

Liroconite

Comments: Large crystals of liroconite up to 1.3 cm.
Location: Gwennap, Cornwall, England. Scale: 6 x 3 cm.
© John Veevaert

Liroconite Crystallography

Axial Ratios:

a:b:c =1.6719:1:1.3064

Cell Dimensions:

a = 12.665, b = 7.575, c = 9.896, Z = 4; beta = 91.25° V = 949.17 Den(Calc)= 3.03

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/a

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

By Intensity(I/I_o): 6.52(1), 6.03(0.8), 3.005(0.5),

Forms:

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Forms: [ 0 1 1] [ 1 1 0]

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Crystal Structure:

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Burns P C , Eby R K , Hawthorne F C , Acta Crystallographica, Section C , 47 (1991) p.916-919, Refinement of the structure of liroconite,, a heteropolyhedral framework oxysalt mineral, Locality: Roughton Gill, England

Physical Properties of Liroconite

Cleavage:

[100] Indistinct, [011] Indistinct

Color:

Light blue, Green, Sky blue, Verdigris green.

Density:

2.9 - 3, Average = 2.95

Diaphaniety:

Transparent to Translucent

Fracture:

Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.

Habit:

Euhedral Crystals - Occurs as well-formed crystals showing good external form.

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Hardness:

2-2.5 - Gypsum-Finger Nail

Luminescence:

None.

Luster:

Vitreous - Resinous

Streak:

light blue

Optical Properties of Liroconite

Gladstone-Dale:

CI meas= -0.021 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2133,KPDmeas= 0.2191,KC= 0.2147

Optical Data:

Biaxial (-), a=1.612, b=1.652, g=1.675, bire=0.0630, 2V(Calc)=72, 2V(Meas)=67. Dispersion none.

Calculated Properties of Liroconite

Electron Density:

r_electron=2.97 gm/cc
note: r_Liroconite=3.03 gm/cc.

Fermion Index

Fermion Index = 0.00021
Boson Index = 0.99979

Photoelectric:

PE_Liroconite= 24.33 barns/electron
U=PE_Liroconite x r_electron= 72.19 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Liroconite is Not Radioactive

Liroconite Classification

Dana Class:

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

(42.2)where (AB)3 (XO4) Zq · x(H2O)

(42.2.1)Dana Group

42.2.1.1 Liroconite Cu2Al(AsO4)(OH)4·4(H2O) I2/a 2/m

Strunz Class:

VII/D.20-40 VII - Phosphates, Arsenates and Vanadates

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

VII/D.20 - Zapatalite - Chalcophyllite series

VII/D.20-10 Zapatalite Cu3Al4(PO4)3(OH)9·4(H2O) Unk Tetra

VII/D.20-20 Ceruleite Cu2Al7(AsO4)4(OH)13·12(H2O) P1 1

VII/D.20-30 Parnauite Cu9(AsO4)2(SO4)(OH)10·7(H2O) P 2₁22 2 2 2

VII/D.20-35 Leogangite! Cu10(AsO4)4(SO4)(OH)6·8(H2O) C 2/c 2/m

VII/D.20-40 Liroconite Cu2Al(AsO4)(OH)4·4(H2O) I2/a 2/m

VII/D.20-50 Chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27·33(H2O) R 3m 3 2/m

Other Liroconite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Liroconite

Cu2Al(AsO4)(OH)4·4(H2O)
Dana No: 42.2.1.1 Strunz No: VII/D.20-40
Locality:

Notes: