Takovite Mineral Data

Takovite Mineral Data +

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General Takovite Information

Chemical Formula:

Ni6Al2(OH)16(CO3,OH)·4(H2O)

Composition:

Molecular Weight = 799.54 gm

Aluminum 6.75 % Al 12.75 % Al₂O₃

Nickel 44.04 % Ni 56.05 % NiO

Hydrogen 3.06 % H 27.32 % H₂O

Carbon 1.13 % C 4.13 % CO₂

Oxygen 45.02 % O

______ ______

100.00 % 100.25 % = TOTAL OXIDE

Empirical Formula:

Ni₆Al₂(OH)₁₆(CO₃)_0.75(OH)_0.25·4(H₂O)

Environment:

Metamorphosed serpentinite.

IMA Status:

Valid Species (Pre-IMA) 1957

Locality:

Takovo, Serbia. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

Eardleyite-Zn

Takovite Image

Images:

Takovite

Comments: Aqua-colored takovite on rock.
Location: Carr-Boyd Nickel Mine, Western Australia, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Takovite Crystallography

Axial Ratios:

a:c = 1:7.47682

Cell Dimensions:

a = 6.04, c = 45.16, Z = 3; V = 1,426.79 Den(Calc)= 2.79

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 7.57(1), 1.917(0.9), 2.552(0.9),2.26(0.8), 3.77(0.8), 1.708(0.7), 2.38(0.5), 2.6(0.4),

Physical Properties of Takovite

Color:

Blue green, Yellow green.

Density:

2.798

Diaphaniety:

Transparent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2 - Gypsum

Luster:

Pearly

Optical Properties of Takovite

Gladstone-Dale:

CI meas= 0.051 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.049 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2156,KPDmeas= 0.215,KC= 0.2266

Optical Data:

Uniaxial (-), e=1.598, w=1.605, bire=0.0070.

Calculated Properties of Takovite

Electron Density:

r_electron=2.81 gm/cc
note: r_Takovite=2.79 gm/cc.

Fermion Index

Fermion Index = 0.00532
Boson Index = 0.99468

Photoelectric:

PE_Takovite= 17.27 barns/electron
U=PE_Takovite x r_electron= 48.54 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Takovite is Not Radioactive

Takovite Classification

Dana Class:

16b.6.3.2 (16b)Carbonates - Hydroxyl or Halogen

(16b.6)Dana Type

(16b.6.3)Sjorgrenite-Hydrotalcite Group (Hydrotalcite Subgroup:Rhombohedral)

16b.6.3.1 Reevesite Ni6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

16b.6.3.2 Takovite Ni6Al2(OH)16(CO3,OH)·4(H2O) R 3m 3 2/m

16b.6.3.3 Comblainite Ni6Co2(CO3)(OH)16·4(H2O) R 3m 3 2/m

Strunz Class:

V/E.03-50 V - Nitrates, Carbonates and Borates

V/E - Water-bearing carbonates with unfamiliar anions

V/E.03 - Hydrotalcite group

V/E.03-10 Hydrotalcite Mg6Al2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-20 Stichtite Mg6Cr2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-30 Pyroaurite Mg6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-40 Desautelsite Mg6Mn2(CO3)(OH)16·4(H2O) R 3m or R 3m Trig

V/E.03-50 Takovite Ni6Al2(OH)16(CO3,OH)·4(H2O) R 3m 3 2/m

V/E.03-60 Reevesite Ni6Fe2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-70 Comblainite Ni6Co2(CO3)(OH)16·4(H2O) R 3m 3 2/m

V/E.03-80 Sergeevite Ca2Mg11(CO3)9(HCO3)4(OH)4·6(H2O) R 32 3 2

Other Takovite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

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

Takovite

Ni6Al2(OH)16(CO3,OH)·4(H2O)
Dana No: 16b.6.3.2 Strunz No: V/E.03-50
Locality:

Notes: