Annabergite Mineral Data

Annabergite Mineral Data +

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General Annabergite Information

Chemical Formula:

Ni3(AsO4)2·8(H2O)

Composition:

Molecular Weight = 598.03 gm

Nickel 29.44 % Ni 41.48 % Ni₂O₃

Arsenic 25.06 % As 38.43 % As₂O₅

Hydrogen 2.70 % H 24.10 % H₂O

Oxygen 42.81 % O

______ ______

100.00 % 104.01 % = TOTAL OXIDE

Empirical Formula:

Ni₃(AsO₄)₂·8(H₂O)

IMA Status:

Valid Species (Pre-IMA) 1852

Locality:

Annaberg, Germany. Link to MinDat.org Location Data.

Name Origin:

Named after its locality.

Synonym:

ICSD 81386

Nickel Bloom

PDF 35-568

Annabergite Image

Images:

Annabergite

Comments: Green spray of annabergite crystals.
Location: Laurium, Greece. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Annabergite Crystallography

Axial Ratios:

a:b:c =0.7619:1:0.3536

Cell Dimensions:

a = 10.122, b = 13.284, c = 4.698, Z = 2; beta = 104.75° V = 610.88 Den(Calc)= 3.25

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: I2/m

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

By Intensity(I/I_o): 6.58(1), 2.98(0.3), 3.18(0.26),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
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H - Help Screen
I - Data Info
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Wildner M , Giester G , Lengauer C L , McCammon C A , European Journal of Mineralogy , 8 (1996) p.187-192, Structure and crystal chemistry of vivianite-type compounds: Crystal, structures of erythrite and annabergite with a Mossbauer study of erythrite

Physical Properties of Annabergite

Cleavage:

[010] Perfect

Color:

Apple green, Greenish white, Gray, Yellow green, White.

Density:

3 - 3.1, Average = 3.05

Diaphaniety:

Transparent to Subtransparent to translucent

Fracture:

Brittle - Generally displayed by glasses and most non-metallic minerals.

Habit:

Earthy - Dull, clay-like texture with no visible crystalline affinities, (e.g. howlite).

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Hardness:

2 - Gypsum

Luminescence:

None.

Luster:

Pearly

Streak:

light green

Optical Properties of Annabergite

Gladstone-Dale:

CI meas= 0.245 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.292 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2017,KPDmeas= 0.215,KC= 0.2848

Optical Data:

Biaxial (-), a=1.622, b=1.658, g=1.687, bire=0.0650, 2V(Calc)=82, 2V(Meas)=84. Dispersion relatively weak.

Calculated Properties of Annabergite

Electron Density:

r_electron=3.00 gm/cc
note: r_Annabergite=3.05 gm/cc.

Fermion Index

Fermion Index = 0.00353
Boson Index = 0.99647

Photoelectric:

PE_Annabergite= 28.21 barns/electron
U=PE_Annabergite x r_electron= 84.59 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Annabergite is Not Radioactive

Annabergite Classification

Dana Class:

40.3.6.4 (40)Hydrated Phosphates, etc

(40.3)where (A++)3 (XO4)2 · x(H2O)

(40.3.6)Dana Group

40.3.6.1 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.2 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

40.3.6.3 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.4 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.5 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.6 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

40.3.6.7 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

40.3.6.8 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

40.3.6.9 IMA2004-021! Co3(PO4)2·8(H2O) C 2/m 2/m

Strunz Class:

VII/C.13-80 VII - Phosphates, Arsenates and Vanadates

VII/C - Water-bearing phosphates without unfamiliar anions. cations of medium and small size: Be and Mn, Fe, Cu, Zn, Mg

VII/C.13 - Vivianite group

VII/C.13-10 Bobierrite Mg3(PO4)2·8(H2O) C 2/c 2/m

VII/C.13-20* Cattiite! Mg3(PO4)2·22(H2O) P1 1

VII/C.13-20 Manganese-hornesite (Mn,Mg)3(AsO4)2·8(H2O) P 2₁/c 2/m

VII/C.13-30 Baricite (Mg,Fe)3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-40 Vivianite Fe3(PO4)2·8(H2O) C 2/m 2/m

VII/C.13-45 Arupite (Ni,Fe)3(PO4)2·8(H2O) I2/m 2/m

VII/C.13-50 Hornesite Mg3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-60 Parasymplesite Fe3(AsO4)2·8(H2O) C 2/m 2/m

VII/C.13-70 Erythrite Co3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-80 Annabergite Ni3(AsO4)2·8(H2O) I2/m 2/m

VII/C.13-90 Kottigite Zn3(AsO4)2·8(H2O) C 2/m 2/m

Other Annabergite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32)

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Annabergite

Ni3(AsO4)2·8(H2O)
Dana No: 40.3.6.4 Strunz No: VII/C.13-80
Locality:

Notes: