Chalcophyllite Mineral Data
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 % Al2 O3
Copper 37.99 % Cu 42.78 % Cu2 O
Arsenic 7.47 % As 11.45 % As2 O5
Hydrogen 3.31 % H 29.62 % H2 O
Sulfur 3.20 % S 7.98 % SO3
Oxygen 46.24 % O
______ ______
100.00 % 95.22 % = TOTAL OXIDE
Empirical Formula:
Cu18 Al2 (AsO4 )3 (SO4 )3 (OH)27 •36(H2 O)
IMA Status:
Valid Species (Pre-IMA) 1847
Locality:
Link to MinDat.org Location Data.
Name Origin:
From the Greek, "copper" and fyllon, "leaf."
Name Pronunciation:
Chalcophyllite
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 Scalenohedral H-M Symbol (3 2/m) Space Group: R 3 m
X Ray Diffraction:
By Intensity(I/Io ): 2.59(1), 4.79(1), 9.54(1),
Forms:
Mouse
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Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
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Forms:
( 1 1 1)
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Physical Properties of Chalcophyllite
Cleavage:
{0001} Perfect
Color:
Emerald green, Bluish green, Grass green.
Density:
2.4 - 2.66, Average = 2.53
Diaphaneity:
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:
Non-fluorescent.
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 Ncalc = 1.58 - 1.64
Optical Data:
Uniaxial (-), e=1.552-1.575, w=1.618-1.632, bire=0.0570-0.0660.
Calculated Properties of Chalcophyllite
Electron Density:
Bulk Density (Electron Density)=2.50 gm/cc note: Specific Gravity of Chalcophyllite =2.53 gm/cc.
Fermion Index:
Fermion Index = 0.0004665649 Boson Index = 0.9995334351
Photoelectric:
PEChalcophyllite = 21.40 barns/electronU=PEChalcophyllite x r Electron Density= 53.59 barns/cc.
Radioactivity:
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Chalcophyllite is Not Radioactive
Chalcophyllite Classification
Dana Class:
43.05.14.01 (43) Compound Phosphates, etc.
(43.05) (Hydrated Compound Anions With Hydroxyl or Halogen)
(43.05.14) Dana Group
43.05.14.01 Chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27•33(H2O) R 3 m 3 2/m
Strunz Class:
08.DF.30 08 - PHOSPHATES, ARSENATES, VANADATES
08.D - Phosphates, etc
08.DF -With only medium-sized cations, (OH,etc.):RO4 > 3:1
08.DF.30 Chalcophyllite Cu18Al2(AsO4)3(SO4)3(OH)27•33(H2O) R 3 m 3 2/m
Other Chalcophyllite Information
References:
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)
See Also:
Links to other databases for Chalcophyllite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
6 - GeoScienceWorld
7 - Google Images
8 - Google Scholar
9 - Handbook of Mineralogy (MinSocAm)
10 - Handbook of Mineralogy (UofA)
11 - MinDAT
12 - Mineralienatlas (Deutsch)
13 - Online Mineral Museum
14 - Philatelic Mineralogy
15 - QUT Mineral Atlas
16 - Ruff.Info
17 - WWW-MINCRYST
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Chalcophyllite
Cu++18Al2(AsO4)3(SO4)3(OH)27•33(H2O)
Dana No: 43.05.14.01 Strunz No: 08.DF.30
Locality:
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