Gordaite Mineral Data

Gordaite Mineral Data +

[Fine Minerals] [What's New] [Mineral Galleries] [My Collection] [Mineral Auctions]
Dan Weinrich Fine Minerals
Full-time professional mineral dealer with over 31 years experience in mineral collecting
And 15 years selling mineral specimens on the internet and at major mineral shows

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.

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 - PyramidalH-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

Diaphaniety:

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

Optical Data:

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

Calculated Properties of Gordaite

Electron Density:

r_electron=2.60 gm/cc
note: r_Gordaite=2.63 gm/cc.

Fermion Index

Fermion Index = 0.01771
Boson Index = 0.98229

Photoelectric:

PE_Gordaite= 20.99 barns/electron
U=PE_Gordaite x r_electron= 54.60 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Gordaite is Not Radioactive

Gordaite Classification

Dana Class:

32.4.7.1 (32)Compound Sulfates

(32.4)(hydrous) with poly-anionic formula

(32.4.7)Dana Group

32.4.7.1 Gordaite ! NaZn(SO4)(OH)6Cl·6(H2O) P 3 3

Strunz Class:

III/D.03-25 III - Halogenides

III/D - Oxi-halogenides with Mg - Mn - Cu - Zn - Sn

III/D.03 - Atacamite series, Claringbullite - Connellite

III/D.03-10 Claringbullite Cu4(OH)7Cl P 6₃/mmc 6/m 2/m 2/m

III/D.03-20 Simonkolleite Zn5(OH)8Cl2·(H2O) R 3m 3 2/m

III/D.03-25 Gordaite NaZn(SO4)(OH)6Cl·6(H2O) P 3 3

III/D.03-30 Buttgenbachite Cu19Cl4(NO3)2(OH)32·2(H2O) P 6₃/mmc 6/m 2/m 2/m

III/D.03-40 Connellite Cu19Cl4(SO4)(OH)32·3(H2O) P 62c 6 m2

III/D.03-50 Khaidarkanite! Na0.34Cu4Al3(OH)14F3·2(H2O) C 2/m 2/m

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 -Google Images 4 -Google Scholar 5 -MinDAT 6 -MinMax(Deutsch) 7 -MinMax(English) 8 -Mineralienatlas (Deutsch) 9 -QUT Mineral Atlas

Search for Gordaite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Gordaite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Gordaite Mineral Data :

Ask about Gordaite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Gordaite

NaZn(SO4)(OH)6Cl·6(H2O)
Dana No: 32.4.7.1 Strunz No: III/D.03-25
Locality:

Notes: