Alumoklyuchevskite Mineral Data

Alumoklyuchevskite Mineral Data

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General Alumoklyuchevskite Information

Chemical Formula:

K3Cu3AlO2(SO4)4

Composition:

Molecular Weight = 751.17 gm

Potassium 15.62 % K 18.81 % K₂O

Aluminum 3.59 % Al 6.79 % Al₂O₃

Copper 25.38 % Cu 31.77 % CuO

Sulfur 17.08 % S 42.63 % SO₃

Oxygen 38.34 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K₃Cu₃AlO₂(SO₄)₄

Environment:

A volcanic exhalation.

IMA Status:

Approved IMA 1995

Locality:

The second cone of the Northern Breakthrough of the Main Tolbachik fracture eruption, Kamchatka, Russia. Link to MinDat.org Location Data.

Name Origin:

It is the aluminum dominant analog of klyuchevskite.

Synonym:

IMA1993-004

Alumoklyuchevskite Image

Images:

Alumoklyuchevskite

Comments: Very small olive-greenish prismatic crystals of alumoklyuchevskite.
Location: Tolbachik volcano, Kamchatka, Russia. Scale: Sample size 1.8 x 1.5 mm.
© Thomas Witzke / Abraxas-Verlag

Alumoklyuchevskite Crystallography

Axial Ratios:

a:b:c =3.5866:1:3.6368

Cell Dimensions:

a = 18.432, b = 5.139, c = 18.69, Z = 4; beta = 101.12° V = 1,737.12 Den(Calc)= 2.87

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: I2

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

By Intensity(I/I_o): 9.04(1), 9.15(0.84), 3.781(0.37),

Physical Properties of Alumoklyuchevskite

Cleavage:

[001] Perfect

Color:

Dark green.

Density:

3.1

Diaphaniety:

Transparent

Habit:

Acicular - Occurs as needle-like crystals.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Hardness:

2 - Gypsum

Luster:

Vitreous (Glassy)

Streak:

light green

Optical Properties of Alumoklyuchevskite

Gladstone-Dale:

CI meas= -0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.115 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.201,KPDmeas= 0.1861,KC= 0.1804

Optical Data:

Biaxial (+), a=1.542, b=1.548, g=1.641, bire=0.0990, 2V(Calc)=30, 2V(Meas)=30.

Pleochroism (x):

light green.

Pleochroism (y):

grayish green.

Pleochroism (z):

dark green.

Calculated Properties of Alumoklyuchevskite

Electron Density:

r_electron=3.01 gm/cc
note: r_{Alumoklyuchevskite}=3.10 gm/cc.

Fermion Index

Fermion Index = 0.00148
Boson Index = 0.99852

Photoelectric:

PE_{Alumoklyuchevskite}= 13.74 barns/electron
U=PE_{Alumoklyuchevskite} x r_electron= 41.40 barns/cc.

Radioactivity:

GRapi = 218.94 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Alumoklyuchevskite - barely detectable

Alumoklyuchevskite Classification

Dana Class:

28.4.6.2 (28)Anhydrous Acid and Sulfates

(28.4)with miscellaneous formulae

(28.4.6)Dana Group

28.4.6.1 Klyuchevskite K3Cu3(Fe,Al)O2(SO4)4 Unk. Mono

28.4.6.2 Alumoklyuchevskite K3Cu3AlO2(SO4)4 I2 2

Strunz Class:

VI/B.05-45 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/B - Waterfree sulfates [SO4]2- with unfamiliar anions. cations of medium size

VI/B.05 - Fedotovite - Klyuchevskite series

VI/B.05-10 Fedotovite K2Cu3(SO4)3O P 2₁/c 2/m

VI/B.05-20 Chlorothionite K2Cu(SO4)Cl2 P nma 2/m 2/m 2/m

VI/B.05-30 Kamchatkite KCu3OCl(SO4)2 P na2₁ mm2

VI/B.05-40 Piypite K2Cu2(SO4)2O I 4 4

VI/B.05-45 Alumoklyuchevskite K3Cu3AlO2(SO4)4 I2 2

VI/B.05-50 Klyuchevskite K3Cu3(Fe,Al)O2(SO4)4 Unk. Mono

VI/B.05-50* Klyuchevskite-Duplicate K3Cu3FeO2(SO4)4 I2/m, Im, or I2 Mono

Other Alumoklyuchevskite Information

References:

NAME( MinRec) PHYS. PROP.(Am.Min.,Vol.81,1996) OPTIC PROP.(MinRec)

See Also:

Links to other databases for Alumoklyuchevskite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas

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

Alumoklyuchevskite

K3Cu3AlO2(SO4)4
Dana No: 28.4.6.2 Strunz No: VI/B.05-45
Locality:

Notes: