Pertlikite Mineral Data

General Pertlikite Information

Chemical Formula:

K2(Fe++,Mg)2(Mg,Fe+++)4Fe+++2Al(SO4)12•18H2O

Composition:

Molecular Weight = 1,933.91 gm

Potassium 4.00 % K 4.82 % K₂O

Sodium 0.01 % Na 0.02 % Na₂O

Magnesium 3.78 % Mg 6.27 % MgO

Manganese 0.77 % Mn 0.99 % MnO

Aluminum 1.40 % Al 2.64 % Al₂O₃

Zinc 0.03 % Zn 0.04 % ZnO

Iron 13.63 % Fe 4.20 % FeO / 14.82 % Fe₂O₃

Hydrogen 1.88 % H 16.77 % H₂O

Sulfur 19.90 % S 49.68 % SO₃

Oxygen 54.60 % O

______ ______

100.00 % 100.25 % = TOTAL OXIDE

Empirical Formula:

K_1.98Na_0.01Fe²⁺_1.13Mg_0.49Mn²⁺_0.27Fe³⁺_0.1Zn_0.01Mg_2.52Fe³⁺_1.49Fe³⁺₂Al(SO₄)₁₂·18(H₂O)

Environment:

Occurs in a pyrite-bearing trachytic eruptive rock, and probably formed after the decomposition of pyrite. Voltaite group.

IMA Status:

Approved IMA 2005 (Dana # Added)

Locality:

Madeni Zakh, Iran. Link to MinDat.org Location Data.

Name Origin:

Named for Franz Pertlik, Professor of Mineralogy and Crystallography, University of Vienna, Austria.

Synonym:

IMA2005-055

Pertlikite Image

Images:

Pertlikite

Comments: B&W image of dark olive green to black crystal of pertlikite from the type material. (AmMin, v46:661).
Location: Madeni Zakh, Iran. Scale: Crystal size 1 mm.
© Canadian Mineralogist

Pertlikite Crystallography

Axial Ratios:

a:c = 1:1.41689

Cell Dimensions:

a = 19.208, c = 27.2158, Z = 8; V = 10,041.19 Den(Calc)= 2.56

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/acd

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

By Intensity(I/I_o): 3.396(1), 2.848(0.31), 2.078(0.29),5.543(0.28), 1.601(0.21), 2.534(0.21), 3.136(0.21),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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S - Stereo Pair on/off
H - Help Screen
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Ertl A , Dyar M D , Hughes J M , Brandstatter F , Gunter M E , Prem M , Peterson R C , The Canadian Mineralogist , 46 (2008) p.661-669, Pertlikite, a new tetragonal Mg-rich member of the voltaite group from Madeni Zakh, Iran, Locality: Madeni Zakh, Iran

Physical Properties of Pertlikite

Cleavage:

None

Color:

Dark olive green, Black.

Density:

2.59

Diaphaneity:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Granular - Generally occurs as anhedral to subhedral crystals in matrix.

Luster:

Vitreous (Glassy)

Optical Properties of Pertlikite

Gladstone-Dale:

CI meas= 0.009 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= -0.003 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2297,KPDmeas= 0.227,KC= 0.229
Ncalc = 1.59

Optical Data:

Uniaxial (-), e=1.586, w=1.59, bire=0.0040.

Calculated Properties of Pertlikite

Electron Density:

Bulk Density (Electron Density)=2.58 gm/cc
note: Specific Gravity of Pertlikite =2.56 gm/cc.

Fermion Index:

Fermion Index = 0.0084483998
Boson Index = 0.9915516002

Photoelectric:

PE_Pertlikite= 5.92 barns/electron
U=PE_Pertlikite x r_electron= 15.25 barns/cc.

Radioactivity:

GRapi = 58.10 (Gamma Ray American Petroleum Institute Units)
Concentration of Pertlikite per GRapi unit = 1.72 (%)

Estimated Radioactivity from Pertlikite - barely detectable

Pertlikite Classification

Dana Class:

29.09.01.03 (29)Hydrated Acid and Sulfates

(29.09)with miscellaneous formulae

(29.09.01)Voltaite Group

29.09.01.01 Voltaite K2Fe5Fe3Al(SO4)12•18(H2O) F d3c 4/m 3 2/m

29.09.01.02 Zincovoltaite K2Zn5Fe3Al(SO4)12•18(H2O) F d3c 4/m 3 2/m

29.09.01.03 Pertlikite! K2(Fe,Mg)2(Mg,Fe)4Fe2Al(SO4)12•18H2O I 4₁/acd 4/m 2/m 2/m

Strunz Class:

07.CC.25 07 - SULFATES (SELENATES, TELLURATES)

07.C - Sulfates (selenates, etc.) without Additional Anions, with H2O

07.CC -With medium-sized and large cations

07.CC.25 Monsmedite? H8K2Tl2(SO4)8•11(H2O) F d3c 4/m 3 2/m

07.CC.25 Voltaite K2Fe5Fe3Al(SO4)12•18(H2O) F d3c 4/m 3 2/m

07.CC.25 Zincovoltaite K2Zn5Fe3Al(SO4)12•18(H2O) F d3c 4/m 3 2/m

07.CC.25 Pertlikite! K2(Fe,Mg)2(Mg,Fe)4Fe2Al(SO4)12•18H2O I 4₁/acd 4/m 2/m 2/m

Other Pertlikite Information

References:

NAME( AmMin, v46:661) PHYS. PROP.(AmMin, v46:661) OPTIC PROP.(AmMin, v46:661)

See Also:

Links to other databases for Pertlikite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info

Search for Pertlikite using:

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Ask about Pertlikite 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 Pertlikite Specimen Label here :

Pertlikite

K2(Fe++,Mg)2(Mg,Fe+++)4Fe+++2Al(SO4)12•18H2O
Dana No: 29.09.01.03 Strunz No: 07.CC.25
Locality:

Notes: