Mineralogy Database

Gerdtremmelite Mineral Data

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General Gerdtremmelite Information

Help on Chemical  Formula: Chemical Formula: ZnAl2(AsO4)(OH)5
Help on Composition: Composition: Molecular Weight = 343.31 gm
   Aluminum  15.72 %  Al   29.70 % Al2O3
   Zinc      19.05 %  Zn   23.71 % ZnO
   Arsenic   21.82 %  As   33.47 % As2O5
   Hydrogen   1.47 %  H    13.12 % H2O
   Oxygen    41.94 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: ZnAl2(AsO4)(OH)5
Help on Environment: Environment: Deeply oxidized ore zone at Tsumeb.
Help on IMA Status: IMA Status: Approved IMA 1985
Help on Locality: Locality: Tsumeb, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Gerd Tremmel, who first recognized the mineral.
Help on Name Pronunciation: Name Pronunciation: Gerdtremmelite + Pronunciation Say GERDTREMMELITE

Gerdtremmelite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.3964:1:0.3787
Help on Cell Dimensions: Cell Dimensions: a = 5.169, b = 13.038, c = 4.938, Z = 2; alpha = 98.78°, beta = 100.8°, gamma = 78.73° V = 316.83 Den(Calc)= 3.60
Help on Crystal System: Crystal System: Triclinic Space Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.771(1), 3.14(0.5), 3.631(0.5),

Physical Properties of Gerdtremmelite

Help on Cleavage: Cleavage: None
Help on Color: Color: Brown, Yellowish brown, Dark brown.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Habit: Habit: Spherical - Spherical, rounded aggregates.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Luminescence: Luminescence: Non-fluorescent.
Help on Luster: Luster: Adamantine
Help on Streak: Streak: white

Optical Properties of Gerdtremmelite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.109 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2193,KC= 0.1978
Ncalc = 1.71
Help on Optical Data: Optical Data: Biaxial (?), a=1.73-1.74, g=1.83-1.84, bire=0.1000

Calculated Properties of Gerdtremmelite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Gerdtremmelite =3.58 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0080127918
Boson Index = 0.9919872082
Help on Photoelectric: Photoelectric: PEGerdtremmelite = 24.54 barns/electron
U=PEGerdtremmelite x rElectron Density= 84.95 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerdtremmelite is Not Radioactive

Gerdtremmelite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.03)where (A B)3 (XO4) Zq
  (41.03.07)Dana Group Gerdtremmelite ZnAl2(AsO4)(OH)5 P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 08.BE.40 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1
08.BE.40 Gerdtremmelite ZnAl2(AsO4)(OH)5 P1 or P1 Tri

Other Gerdtremmelite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Gerdtremmelite :
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

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Dana No: Strunz No: 08.BE.40





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