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Chalcoalumite Mineral Data

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General Chalcoalumite Information

Help on Chemical  Formula: Chemical Formula: CuAl4(SO4)(OH)12•3(H2O)
Help on Composition: Composition: Molecular Weight = 525.67 gm
   Aluminum  20.53 %  Al   38.79 % Al2O3
   Copper    12.09 %  Cu   13.61 % Cu2O
   Hydrogen   3.45 %  H    30.84 % H2O
   Sulfur     6.10 %  S    15.23 % SO3
   Oxygen    57.83 %  O
            ______        ______ 
            100.00 %       98.48 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: CuAl4(SO4)(OH)12•3(H2O)
Help on Environment: Environment: Secondary mineral in the oxidized portions of copper deposits.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1925
Help on Locality: Locality: Bisbee, Cochise Co., and in the Grandview mine, Grand Canyon, Coconino Co., Arizona. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek chalkos, for copper and Latin alum, for aluminum sulfate.
Help on Name Pronunciation: Name Pronunciation: Chalcoalumite Say CHALCOALUMITE

Chalcoalumite Image

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Comments: Pale bluish stellate twins of chalcoalumite on matrix.
Location: Lavender Pit, Bisbee, Cohchise County, Arizona, USA. Scale: Size Not Given.
© Lou Perloff / Photo Atlas of Minerals

Chalcoalumite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =1.9169:1:1.1464
Help on Cell Dimensions: Cell Dimensions: a = 17.09, b = 8.915, c = 10.221, Z = 4; beta = 95.883° V = 1,549.04 Den(Calc)= 2.25
Help on Crystal System: Crystal System: Monoclinic - Sphenoidal H-M Symbol (2) Space Group: P 21
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.5(1), 4.25(0.91), 4.18(0.23),

Physical Properties of Chalcoalumite

Help on Cleavage: Cleavage: {100} Perfect
Help on Color: Color: Blue, Blue gray, Greenish blue, Light blue green.
Help on Density: Density: 2.29
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Encrustations - Forms crust-like aggregates on matrix.
Help on Habit: Habit: Fibrous - Crystals made up of fibers.
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Vitreous - Dull
Help on Streak: Streak: bluish white

Optical Properties of Chalcoalumite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.063 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.047 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2326,KPDmeas= 0.2285,KC= 0.244
Ncalc = 1.55 - 1.56
Help on Optical Data: Optical Data: Biaxial (+), a=1.52, b=1.52, g=1.53, bire=0.0100, 2V(Calc)=0, 2V(Meas)=0-15. Dispersion relatively strong.

Calculated Properties of Chalcoalumite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.29 gm/cc
note: Specific Gravity of Chalcoalumite =2.25 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0007402576
Boson Index = 0.9992597424
Help on Photoelectric: Photoelectric: PEChalcoalumite = 6.07 barns/electron
U=PEChalcoalumite x rElectron Density= 13.87 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chalcoalumite is Not Radioactive

Chalcoalumite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.03)where (A+ B++)5 (XO4) Zq�x(H2O)
  (31.03.01)Dana Group Chalcoalumite CuAl4(SO4)(OH)12•3(H2O) P 21 2 Nickelalumite* (Ni,Cu)Al4[(SO4),(NO3)2](OH)12•3(H2O) P 21 2 Kyrgyzstanite! ZnAl4(SO4)(OH)12•3(H2O) P 21/n 2/m
Help on  Strunz Class: Strunz Class: 07.DD.75 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DD -With only medium-sized cations; sheets of edge-sharing octahedra
07.DD.75 Chalcoalumite CuAl4(SO4)(OH)12•3(H2O) P 21 2
07.DD.75 Nickelalumite* (Ni,Cu)Al4[(SO4),(NO3)2](OH)12•3(H2O) P 21 2

Other Chalcoalumite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana)
Help on See Also: See Also: Links to other databases for Chalcoalumite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info
15 - YupRocks

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Dana No: Strunz No: 07.DD.75





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