Mineralogy Database

Graeserite Mineral Data

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General Graeserite Information

Help on Chemical  Formula: Chemical Formula: (Fe+++,Ti)4Ti3AsO13(OH)
Help on Composition: Composition: Molecular Weight = 666.95 gm
   Titanium  21.54 %  Ti   35.93 % TiO2
   Iron      33.49 %  Fe   47.89 % Fe2O3
   Arsenic   11.23 %  As   14.83 % As2O3
   Hydrogen   0.15 %  H     1.35 % H2O
   Oxygen    33.58 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Fe3+4Ti3AsO13(OH)
Help on Environment: Environment: The Fe++ dominant analog of tomichite and the As+++ dominant analog of derbylite. In hydrothermal veins in a two-mica paragneiss.
Help on IMA Status: IMA Status: Approved IMA 1998 (Dana # Added)
Help on Locality: Locality: Larchelitini, in the Monte Leone Nappe, Binntal region, western Alps, Switzerland. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: For Prof. Dr. Stefan Graeser (1935-), in recognition of his extensive research on the oxides and sulfosalts of arsenic in the Binntal region of Switzerland.
Help on Name Pronunciation: Name Pronunciation: Graeserite + Pronunciation Say GRAESERITE
Help on Synonym: Synonym: ICSD 50374

Graeserite Image

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Comments: SEM photomicrograph of an aggregate of hair-like graeserite crystals. CanMin v36:1083.
Location: Monte Leone Nappe, Binntal region, Western Alps, Switzerland. Scale: Scale Bar 1 mm.
© Canadian Mineralogist

Graeserite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5027:1:0.3503
Help on Cell Dimensions: Cell Dimensions: a = 7.184, b = 14.289, c = 5.006, Z = 2; beta = 105.17° V = 495.97 Den(Calc)= 4.47
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.681(1), 2.846(0.8), 1.5825(0.5),

Physical Properties of Graeserite

Help on Cleavage: Cleavage: {100} Distinct
Help on Color: Color: Black.
Help on Density: Density: 4.62
Help on Diaphaneity: Diaphaneity: Opaque
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Acicular - Occurs as needle-like crystals.
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Habit: Habit: Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite)
Help on Hardness: Hardness: 5.5 - Knife Blade
Help on Luster: Luster: Metallic
Help on Streak: Streak: black

Optical Properties of Graeserite

Help on Optical Data: Optical Data: NCalc= 2.48 - from Gladstone-Dale relationship (KC = 0.3315) where Ncalc=Dcalc*KC+1
NCalc= 2.53 - from Gladstone-Dale relationship (KC = 0.3315) where Ncalc=Dmeas*KC+1

Calculated Properties of Graeserite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.24 gm/cc
note: Specific Gravity of Graeserite =4.47 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEGraeserite = 21.57 barns/electron
U=PEGraeserite x rElectron Density= 91.37 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Graeserite is Not Radioactive

Graeserite Classification

Help on  Dana Class: Dana Class: (46)Basic or Halogen-Containing Antimonites, Arsenites and Phosphites
  (46.02)with miscellaneous formulae
  (46.02.03)Derbylite Group Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m
Help on  Strunz Class: Strunz Class: 04.JB.55 04 - OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodate
  04.J - Arsenites, Antimonites, Bismuthites, Sulfites,
  04.JB -Arsenites, antimonites, bismuthites; with additional anions, without H2O
04.JB.55 Derbylite (Fe,Fe,Ti)7SbO13(OH) P 21/m 2/m
04.JB.55 Graeserite! (Fe,Ti)4Ti3AsO13(OH) A2/m 2/m
04.JB.55 Tomichite (V,Fe)4Ti3AsO13(OH) A2/m 2/m

Other Graeserite Information

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

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Dana No: Strunz No: 04.JB.55





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