Mineralogy Database

Rollandite Mineral Data

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General Rollandite Information

Help on Chemical  Formula: Chemical Formula: Cu3(AsO4)2•4(H2O)
Help on Composition: Composition: Molecular Weight = 543.29 gm
   Copper    36.26 %  Cu   45.39 % CuO
   Arsenic   27.58 %  As   42.31 % As2O5
   Hydrogen   1.41 %  H    12.60 % H2O
   Oxygen    34.75 %  O
            ______        ______ 
            100.00 %      100.29 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Cu3.1(AsO4)2•3.8(H2O)
Help on Environment: Environment: Secondary mineral in old Cu mines. New structure-type.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Cu mines of Roua at the western margin of the Barrot Dome, Alpes-Maritimes, France. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Pierre Rolland (1940-), an eminent mineral collector of the Roua mines.
Help on Synonym: Synonym: ICSD 90026

Rollandite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3335:1:0.5704
Help on Cell Dimensions: Cell Dimensions: a = 5.6906, b = 17.061, c = 9.732, Z = 4; V = 944.85 Den(Calc)= 3.82
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.52(1)(020), 3.221(0.9)(141,051), 3.721(0.6)(131),3.102(0.4)(132), 2.795(0.35)(142), 2.817(0.35)(103,033), 2.133(0.25)(080,251), 2.35(0.25)(143,053), 2.366(0.2)(240,071),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

Forms: ( 0 1 0) ( 1 0 1) ( 1 0 0) ( 0 1 1) ( 0 0 1)

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Physical Properties of Rollandite

Help on Cleavage: Cleavage: {001} Good
Help on Color: Color: Bottle green.
Help on Density: Density: 3.9
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: light green

Optical Properties of Rollandite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= -0.025 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.046 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1972,KPDmeas= 0.1932,KC= 0.1885
Ncalc = 1.72 - 1.74
Help on Optical Data: Optical Data: Biaxial (-), a=1.745, b=1.755, g=1.76, bire=0.0150, 2V(Calc)=70, 2V(Meas)=71. Dispersion strong, r < v.

Calculated Properties of Rollandite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.70 gm/cc
note: Specific Gravity of Rollandite =3.90 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.000168915
Boson Index = 0.999831085
Help on Photoelectric: Photoelectric: PERollandite = 34.93 barns/electron
U=PERollandite x rElectron Density= 129.32 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Rollandite is Not Radioactive

Rollandite Classification

Help on  Dana Class: Dana Class: (40)Hydrated Phosphates, etc
  (40.03)where (A++)3 (XO4)2 � x(H2O)
  (40.03.04)Hopeite Group Hopeite Zn3(PO4)2•4(H2O) P nma 2/m 2/m 2/m Rollandite! Cu3(AsO4)2•4(H2O) P nma 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.CD.30 08 - PHOSPHATES, ARSENATES, VANADATES
  08.C - Phosphates without Additional Anions, with H2O
  08.CD -With only medium-sized cations, RO4:H2O = 1:2
08.CD.30 Rollandite! Cu3(AsO4)2•4(H2O) P nma 2/m 2/m 2/m

Other Rollandite Information

Help on References: References: NAME( AmMin, vol 86, p 768) PHYS. PROP.(AmMin, vol 86, p 768) OPTIC PROP.(AmMin, vol 86, p 768)
Help on See Also: See Also: Links to other databases for Rollandite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - Handbook of Mineralogy (UofA)
8 - MinDAT
9 - Mineralienatlas (Deutsch)
10 - Online Mineral Museum
11 - QUT Mineral Atlas
12 - Ruff.Info

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Dana No: Strunz No: 08.CD.30





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