Nickelalumite Mineral Data

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General Nickelalumite Information

Chemical Formula:

(Ni,Cu)Al4[(SO4),(NO3)2](OH)12•3(H2O)

Composition:

Molecular Weight = 632.31 gm

Aluminum 17.07 % Al 32.25 % Al₂O₃

Copper 3.01 % Cu 3.77 % CuO

Nickel 6.50 % Ni 8.27 % NiO

Hydrogen 2.87 % H 25.64 % H₂O

Sulfur 7.61 % S 18.99 % SO₃

Nitrogen 2.22 % N 8.54 % N₂O₅

Oxygen 60.73 % O

______ ______

100.00 % 97.47 % = TOTAL OXIDE

Empirical Formula:

Ni_0.7Cu_0.3Al₄(SO₄)_1.5(NO₃)(OH)₁₂•3(H₂O)

Environment:

Crusts on gypsum crystals.

IMA Status:

Not Approved IMA 1980

Locality:

Mbobo Mkulu cave, eastern Transvaal, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named in allusion to its composition.

Name Pronunciation:

Nickelalumite + Pronunciation

Nickelalumite Image

Images:

Nickelalumite

Comments: Aggregates of blue neckelaluminite spherulites on matrix.
Location: Jomde mine, San Juan County, Utah, USA. Scale: See Image.
© Rruff Database

Nickelalumite Crystallography

Axial Ratios:

a:b:c =1.1484:1:1.9383

Cell Dimensions:

a = 10.175, b = 8.86, c = 17.174, Z = 4; beta = 95.95° V = 1,539.90 Den(Calc)= 2.73

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: P 2₁

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

By Intensity(I/I_o): 8.543(1), 1.997(0.2), 7.877(0.2),

Crystal Structure:

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Uvarova Y A , Sokolova E , Hawthorne F C , Karpenko V V , Agakhanov A A , Pautov L A , The Canadian Mineralogist , 43 (2005) p.1511-1519, The crystal chemistry of the nickelalumite -group minerals

Physical Properties of Nickelalumite

Cleavage:

{???} Perfect

Color:

Sky blue.

Density:

2.24

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Nodular - Tuberose forms having irregular protuberances over the surface.

Hardness:

2.5 - Finger Nail

Streak:

bluish white

Optical Properties of Nickelalumite

Gladstone-Dale:

CI meas= -0.047 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.141 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1969,KPDmeas= 0.24,KC= 0.2292
Ncalc = 1.51 - 1.63

Optical Data:

Biaxial (?), a=1.532, g=1.543, bire=0.0110

Calculated Properties of Nickelalumite

Electron Density:

Bulk Density (Electron Density)=2.28 gm/cc
note: Specific Gravity of Nickelalumite =2.24 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Nickelalumite}= 4.81 barns/electron
U=PE_{Nickelalumite} x rElectron Density= 10.94 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Nickelalumite is Not Radioactive

Nickelalumite Classification

Dana Class:

31.03.01.02 (31)Hydrated Sulfates Containing Hydroxyl or Halogen

(31.03)where (A+ B++)5 (XO4) Zq·x(H2O)

(31.03.01)Dana Group

31.03.01.01 Chalcoalumite CuAl4(SO4)(OH)12•3(H2O) P 2₁ 2

31.03.01.02 Nickelalumite* (Ni,Cu)Al4[(SO4),(NO3)2](OH)12•3(H2O) P 2₁ 2

31.03.01.03 Kyrgyzstanite! ZnAl4(SO4)(OH)12•3(H2O) P 2₁/n 2/m

Strunz Class:

07.DD.75 07 - SULFATES (SELENATES, TELLURATES)

07.D - Sulfates (selenates, etc.) with additional anions, with H2O

07.DD -With only medium-sized cations; sheets of edge-sharing octahedra

07.DD.75 Chalcoalumite CuAl4(SO4)(OH)12•3(H2O) P 2₁ 2

07.DD.75 Nickelalumite* (Ni,Cu)Al4[(SO4),(NO3)2](OH)12•3(H2O) P 2₁ 2

Other Nickelalumite Information

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Nickelalumite :
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

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Nickelalumite

(Ni,Cu)Al4[(SO4),(NO3)2](OH)12•3(H2O)
Dana No: 31.03.01.02 Strunz No: 07.DD.75
Locality:

Notes: