Alumoklyuchevskite Mineral Data

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:

Named as 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

Images:

Alumoklyuchevskite Vergasovaite

Comments: Green blebs to prismatic or needle-like crystals of alumoklyuchevskite associated with orange vergasovaite, co-type material.
Location: Main fracture, N breakthrough, Tolbachik Volcano, Kamchatka Peninsula, Russia. Scale: See Image.
© Rruff Database

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 - Sphenoidal H-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

Diaphaneity:

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
Ncalc = 1.52 - 1.56

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:

Bulk Density (Electron Density)=3.01 gm/cc
note: Specific Gravity of Alumoklyuchevskite =3.10 gm/cc.

Fermion Index:

Fermion Index = 0.0014834108
Boson Index = 0.9985165892

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)
Concentration of Alumoklyuchevskite per GRapi unit = 0.46 (%)

Estimated Radioactivity from Alumoklyuchevskite - barely detectable

Alumoklyuchevskite Classification

Dana Class:

28.04.06.02 (28)Anhydrous Acid and Sulfates

(28.04)with miscellaneous formulae

(28.04.06)Klyuchevskite Group

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

28.04.06.02 Alumoklyuchevskite K3Cu3AlO2(SO4)4 I2 2

Strunz Class:

07.BC.45 07 - SULFATES (SELENATES, TELLURATES)

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

07.BC -With medium-sized and large cations

07.BC.45 Alumoklyuchevskite K3Cu3AlO2(SO4)4 I2 2

07.BC.45 Klyuchevskite-Duplicate K3Cu3FeO2(SO4)4 I2/m, Im, or I2 Mono

07.BC.45 Klyuchevskite K3Cu3(Fe,Al)O2(SO4)4 Unk. 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 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info

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Alumoklyuchevskite

K3Cu3AlO2(SO4)4
Dana No: 28.04.06.02 Strunz No: 07.BC.45
Locality:

Notes:

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