Chalcophyllite Mineral Data

Chalcophyllite Mineral Data +

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General Chalcophyllite Information

Chemical Formula:

Cu++18Al2(AsO4)3(SO4)3(OH)27·33(H2O)

Composition:

Molecular Weight = 3,010.49 gm

Aluminum 1.79 % Al 3.39 % Al₂O₃

Copper 37.99 % Cu 42.78 % Cu₂O

Arsenic 7.47 % As 11.45 % As₂O₅

Hydrogen 3.31 % H 29.62 % H₂O

Sulfur 3.20 % S 7.98 % SO₃

Oxygen 46.24 % O

______ ______

100.00 % 95.22 % = TOTAL OXIDE

Empirical Formula:

Cu₁₈Al₂(AsO₄)₃(SO₄)₃(OH)₂₇·36(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1847

Locality:

Link to MinDat.org Location Data.

Name Origin:

From the Greek, "copper" and fyllon, "leaf."

Synonym:

ICSD 100289

PDF 39-1356

Chalcophyllite Image

Images:

Chalcophyllite

Comments: Altered rhyolite vug lined with chalcophyllite crystals. The largest crystal is 0.5 cm across and several have the perfect "stop sign" hexagon form.
Location: Majuba Hill Mine, Pershing County, Nevada, USA. Scale: Picture size 2 cm.
© John Veevaert

Chalcophyllite Crystallography

Axial Ratios:

a:c = 1:5.3389

Cell Dimensions:

a = 10.77, c = 57.5, Z = 3; V = 5,776.04 Den(Calc)= 2.60

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.59(1), 4.79(1), 9.54(1),

Forms:

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

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Crystal Structure:

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Sabelli C , Zeitschrift fur Kristallographie , 151 (1980) p.129-140, The crystal structure of chalcophyllite, Locality: Cornwall, England

Physical Properties of Chalcophyllite

Cleavage:

[0001] Perfect

Color:

Emerald green, Bluish green, Grass green.

Density:

2.4 - 2.66, Average = 2.53

Diaphaniety:

Transparent to translucent

Fracture:

Uneven - Flat surfaces (not cleavage) fractured in an uneven pattern.

Habit:

Massive - Lamellar - Distinctly foliated fine-grained forms.

Habit:

Platy - Sheet forms (e.g. micas).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

2 - Gypsum

Luminescence:

None.

Luster:

Vitreous - Pearly

Streak:

pale green

Optical Properties of Chalcophyllite

Gladstone-Dale:

CI meas= 0.023 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.05 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2286,KPDmeas= 0.2349,KC= 0.2405

Optical Data:

Uniaxial (-), e=1.552-1.575, w=1.618-1.632, bire=0.0570-0.0660.

Calculated Properties of Chalcophyllite

Electron Density:

r_electron=2.50 gm/cc
note: r_{Chalcophyllite}=2.53 gm/cc.

Fermion Index

Fermion Index = 0.00046
Boson Index = 0.99954

Photoelectric:

PE_{Chalcophyllite}= 21.40 barns/electron
U=PE_{Chalcophyllite} x r_electron= 53.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chalcophyllite is Not Radioactive

Chalcophyllite Classification

Dana Class:

43.5.14.1 (43)Compound Phosphates, etc.

(43.5)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.5.14)Dana Group

43.5.14.1 Chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27·33(H2O) R 3m 3 2/m

Strunz Class:

VII/D.20-50 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 Chalcophyllite Information

References:

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

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Chalcophyllite

Cu++18Al2(AsO4)3(SO4)3(OH)27·33(H2O)
Dana No: 43.5.14.1 Strunz No: VII/D.20-50
Locality:

Notes: