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Gordaite Mineral Data

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General Gordaite Information

Help on Chemical  Formula: Chemical Formula: NaZn(SO4)(OH)6Cl•6(H2O)
Help on Composition: Composition: Molecular Weight = 626.20 gm
   Sodium     3.67 %  Na    4.95 % Na2O
   Zinc      41.77 %  Zn   51.99 % ZnO
   Hydrogen   2.90 %  H    25.89 % H2O
   Sulfur     5.12 %  S    12.79 % SO3
   Chlorine   5.66 %  Cl    5.66 % Cl
               -   %   Cl   -1.28 % -O=Cl2   
   Oxygen    40.88 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: NaZn4(SO4)(OH)6Cl•6(H2O)
Help on Environment: Environment: In the oxidation zone of a hydrothermal vein deposit hosted by andesitic rocks.
Help on IMA Status: IMA Status: Approved IMA 1996 (Dana # Added)
Help on Locality: Locality: The San Francisco mine, 2 km northeast of the Sierra Groda Railway Station, in the Sierra Gorda, northeast of Antofagasta, 2nd region, northern Chile. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named after its locality.
Help on Name Pronunciation: Name Pronunciation: Gordaite Say GORDAITE
Help on Synonym: Synonym: ICSD 406090

Gordaite Image

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Comments: Colorless to white tabular crystals of gordaite on matrix.
Location: Mansfeld Basin, Saxony-Anhalt, Germany. Scale: Picture size 5 mm.
© Thomas Witzke / Abraxas-Verlag

Gordaite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:1.55661
Help on Cell Dimensions: Cell Dimensions: a = 8.363, c = 13.018, Z = 2; V = 788.50 Den(Calc)= 2.64
Help on Crystal System: Crystal System: Trigonal - Pyramidal H-M Symbol (3) Space Group: P 3
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 12.95(1), 6.501(0.23), 4.339(0.15),

Physical Properties of Gordaite

Help on Cleavage: Cleavage: {001} Perfect
Help on Color: Color: Colorless, White.
Help on Density: Density: 2.627
Help on Diaphaneity: Diaphaneity: Transparent to translucent
Help on Fracture: Fracture: Flexible - Flexible fragments.
Help on Habit: Habit: Massive - Uniformly indistinguishable crystals forming large masses.
Help on Habit: Habit: Platy - Sheet forms (e.g. micas).
Help on Hardness: Hardness: 2.5 - Finger Nail
Help on Luster: Luster: Vitreous - Pearly
Help on Streak: Streak: white

Optical Properties of Gordaite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.05 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.054 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2081,KPDmeas= 0.2092,KC= 0.2201
Ncalc = 1.58
Help on Optical Data: Optical Data: Uniaxial (-), e=1.5382, w=1.5607, bire=0.0225.

Calculated Properties of Gordaite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.60 gm/cc
note: Specific Gravity of Gordaite =2.63 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEGordaite = 20.99 barns/electron
U=PEGordaite x rElectron Density= 54.60 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Gordaite is Not Radioactive

Gordaite Classification

Help on  Dana Class: Dana Class: (32)Compound Sulfates
  (32.04)(hydrous) with poly-anionic formula
  (32.04.07)Dana Group Gordaite! NaZn(SO4)(OH)6Cl•6(H2O) P 3 3
Help on  Strunz Class: Strunz Class: 07.DF.50 07 - SULFATES (SELENATES, TELLURATES)
  07.D - Sulfates (selenates, etc.) with additional anions, with H2O
  07.DF -With large and medium-sized cations
07.DF.50 Gordaite! NaZn(SO4)(OH)6Cl•6(H2O) P 3 3

Other Gordaite Information

Help on References: References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p185,1998) OPTIC PROP.(MinRec)
Help on See Also: See Also: Links to other databases for Gordaite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - Handbook of Mineralogy (MinSocAm)
7 - MinDAT
8 - Mineralienatlas (Deutsch)
9 - Online Mineral Museum
10 - QUT Mineral Atlas
11 - Ruff.Info

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Dana No: Strunz No: 07.DF.50





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