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Gerdtremmelite Mineral Data
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General Gerdtremmelite Information
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 Chemical Formula: |
ZnAl2(AsO4)(OH)5 |
| Composition: |
Molecular Weight = 343.31 gm |
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Aluminum 15.72 % Al 29.70 % Al2O3 |
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Zinc 19.05 % Zn 23.71 % ZnO |
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Arsenic 21.82 % As 33.47 % As2O5 |
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Hydrogen 1.47 % H 13.12 % H2O |
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Oxygen 41.94 % O |
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______ ______ |
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100.00 % 100.00 % = TOTAL OXIDE |
| Empirical Formula: |
ZnAl2(AsO4)(OH)5 |
| Environment: |
Deeply oxidized ore zone at Tsumeb. |
| IMA Status: |
Approved IMA 1985 |
| Locality: |
Tsumeb, Namibia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Gerd Tremmel, who first recognized the mineral. |
| Name Pronunciation: |
Gerdtremmelite + Pronunciation  |
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Gerdtremmelite Crystallography
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| Axial Ratios: |
a:b:c =0.3964:1:0.3787 |
| 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 |
| Crystal System: |
Triclinic Space Group: P1 or P1 |
| X Ray Diffraction: |
By Intensity(I/Io): 12.771(1), 3.14(0.5), 3.631(0.5), |
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Physical Properties of Gerdtremmelite
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| Cleavage: |
None |
| Color: |
Brown, Yellowish brown, Dark brown. |
| Diaphaneity: |
Transparent |
| Habit: |
Spherical - Spherical, rounded aggregates. |
| Habit: |
Tabular - Form dimensions are thin in one direction. |
| Luminescence: |
Non-fluorescent. |
| Luster: |
Adamantine |
| Streak: |
white |
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Optical Properties of Gerdtremmelite
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| Gladstone-Dale: |
CI calc= -0.109 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2193,KC= 0.1978
Ncalc = 1.71 |
| Optical Data: |
Biaxial (?), a=1.73-1.74, g=1.83-1.84, bire=0.1000 |
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Calculated Properties of Gerdtremmelite
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| Electron Density: |
Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Gerdtremmelite =3.58 gm/cc.
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| Fermion Index: |
Fermion Index = 0.0080127918
Boson Index = 0.9919872082 |
| Photoelectric: |
PEGerdtremmelite = 24.54 barns/electron
U=PEGerdtremmelite x rElectron Density= 84.95 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerdtremmelite is Not Radioactive |
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Gerdtremmelite Classification
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| Dana Class: |
41.03.07.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen |
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(41.03)where (A B)3 (XO4) Zq |
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(41.03.07)Dana Group |
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41.03.07.01 Gerdtremmelite ZnAl2(AsO4)(OH)5 P1 or P1 Tri |
| Strunz Class: |
08.BE.40 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.B - Phosphates, etc. with Additional Anions, without H2O |
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08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1 |
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08.BE.40 Gerdtremmelite ZnAl2(AsO4)(OH)5 P1 or P1 Tri |
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Other Gerdtremmelite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8) |
| 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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Print or Cut-and-Paste your Gerdtremmelite Specimen Label here :
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Gerdtremmelite
ZnAl2(AsO4)(OH)5
Dana No: 41.03.07.01 Strunz No: 08.BE.40
Locality:
Notes:
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