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

Images:

Gordaite

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

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 - Pyramidal H-M Symbol (3) Space Group: P 3

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

By Intensity(I/I_o): 12.95(1), 6.501(0.23), 4.339(0.15),

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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Print or Cut-and-Paste your Gordaite Specimen Label here :

Gordaite

NaZn(SO4)(OH)6Cl•6(H2O)
Dana No: 32.04.07.01 Strunz No: 07.DF.50
Locality:

Notes:

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