Gerdtremmelite Mineral Data

General Gerdtremmelite Information

Chemical Formula:

ZnAl2(AsO4)(OH)5

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

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

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:

TriclinicSpace Group: P1 or P1

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 12.771(1), 3.14(0.5), 3.631(0.5),

Physical Properties of Gerdtremmelite

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

Optical Properties of Gerdtremmelite

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

Calculated Properties of Gerdtremmelite

Electron Density:

Bulk Density (Electron Density)=3.46 gm/cc
note: Specific Gravity of Gerdtremmelite =3.58 gm/cc.

Fermion Index:

Fermion Index = 0.0080127918
Boson Index = 0.9919872082

Photoelectric:

PE_{Gerdtremmelite}= 24.54 barns/electron
U=PE_{Gerdtremmelite} x rElectron Density= 84.95 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gerdtremmelite is Not Radioactive

Gerdtremmelite Classification

Dana Class:

41.03.07.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.03)where (A B)3 (XO4) Zq

(41.03.07)Dana Group

41.03.07.01 Gerdtremmelite ZnAl2(AsO4)(OH)5 P1 or P1 Tri

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

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 :

Gerdtremmelite

ZnAl2(AsO4)(OH)5
Dana No: 41.03.07.01 Strunz No: 08.BE.40
Locality:

Notes: