Gordaite Mineral Data

General Gordaite Information

Chemical Formula: NaZn(SO4)(OH)6Cl•6(H2O) 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 Empirical Formula: NaZn₄(SO₄)(OH)₆Cl•6(H₂O) Environment: In the oxidation zone of a hydrothermal vein deposit hosted by andesitic rocks. IMA Status: Approved IMA 1996 (Dana # Added) 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. Name Origin: Named after its locality. Name Pronunciation: Gordaite Synonym: ICSD 406090   IMA1996-006  

Gordaite Image

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Gordaite Crystallography

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

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Adiwidjaja G , Friese K , Klaska K H , Schluter J , Zeitschrift fur Kristallographie , 212 (1997) p.704-707, The crystal structure of gordaite NaZn4(SO4)(OH)6Cl*6H2O, Locality: San Francisco mine, Sierra Gorda, Chile

 

Physical Properties of Gordaite

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

Optical Properties of Gordaite

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 Optical Data: Uniaxial (-), e=1.5382, w=1.5607, bire=0.0225.  

Calculated Properties of Gordaite

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

Gordaite Classification

Dana Class: 32.04.07.01 (32)Compound Sulfates   (32.04)(hydrous) with poly-anionic formula   (32.04.07)Dana Group  

32.04.07.01 Gordaite! NaZn(SO4)(OH)6Cl•6(H2O) P 3 3

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

References: NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.83,p185,1998) OPTIC PROP.(MinRec) 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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