Mineralogy Database

Zaherite Mineral Data

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General Zaherite Information

Help on Chemical  Formula: Chemical Formula: Al12(SO4)5(OH)26•20H20
Help on Composition: Composition: Molecular Weight = 1,606.59 gm
   Aluminum  20.15 %  Al   38.08 % Al2O3
   Hydrogen   4.14 %  H    37.00 % H2O
   Sulfur     9.98 %  S    24.92 % SO3
   Oxygen    65.73 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Al12(SO4)5(OH)26•20(H2O)
Help on Environment: Environment: In a massive kaolinite-boehmite rock.
Help on IMA Status: IMA Status: Approved IMA 1977
Help on Locality: Locality: Salt Range, Pakistan. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for M. A. Zaher, Geological Survey of Bangladesh, who discovered the mineral.
Help on Name Pronunciation: Name Pronunciation: Zaherite Say ZAHERITE

Zaherite Image

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Comments: Gray to white translucent prismatic to massive zaherite comprising portion of rock.
Location: Pella, Namaqualand, Northern Cape Province, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Zaherite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.9496:1:0.1938
Help on Cell Dimensions: Cell Dimensions: a = 18.475, b = 19.454, c = 3.771, Z = 1; alpha = 95.24°, beta = 91.48°, gamma = 80.24° V = 1,329.70 Den(Calc)= 2.01
Help on Crystal System: Crystal System: Triclinic Space Group: P1 or P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 18.12(1), 3.22(0.8), 4.61(0.8),

Physical Properties of Zaherite

Help on Cleavage: Cleavage: {???} Good
Help on Color: Color: White, Light bluish green.
Help on Density: Density: 2.007 - 2.011, Average = 2
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Habit: Habit: Cryptocrystalline - Occurs as crystals too small to distinguish with the naked eye.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Hardness: Hardness: 3.5 - Copper Penny
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: white

Optical Properties of Zaherite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2479,KPDmeas= 0.2481,KC= 0.2487
Ncalc = 1.5
Help on Optical Data: Optical Data: Biaxial (+), a=1.498, b=1.4981, g=1.499, bire=0.0010, 2V(Calc)=38, 2V(Meas)=moderate.

Calculated Properties of Zaherite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.08 gm/cc
note: Specific Gravity of Zaherite =2.01 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0010701619
Boson Index = 0.9989298381
Help on Photoelectric: Photoelectric: PEZaherite = 1.29 barns/electron
U=PEZaherite x rElectron Density= 2.67 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Zaherite is Not Radioactive

Zaherite Classification

Help on  Dana Class: Dana Class: (31)Hydrated Sulfates Containing Hydroxyl or Halogen
  (31.10.03)Dana Group Zaherite Al12(SO4)5(OH)26•20H20 P1 or P1 Tri
Help on  Strunz Class: Strunz Class: 07.DE.65 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DE -With only medium-sized cations; unclassified
07.DE.65 Zaherite Al12(SO4)5(OH)26•20H20 P1 or P1 Tri

Other Zaherite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Zaherite :
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: 07.DE.65





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