Giniite Mineral Data

Giniite Mineral Data +

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General Giniite Information

Chemical Formula:

Fe++Fe+++4(PO4)4(OH)2·2(H2O)

Composition:

Molecular Weight = 729.17 gm

Iron 38.30 % Fe 9.85 % FeO / 43.80 % Fe₂O₃

Phosphorus 16.99 % P 38.93 % P₂O₅

Hydrogen 0.83 % H 7.41 % H₂O

Oxygen 43.88 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Fe²⁺Fe³⁺₄(PO₄)₄(OH)₂·2(H₂O)

Environment:

In a pegmatite.

IMA Status:

Approved IMA 1980

Locality:

Sandamab, near Usakos, Namibia. Link to MinDat.org Location Data.

Name Origin:

Named by Paul Keller for his wife, Gini Keller.

Giniite Image

Images:

Giniite

Comments: Dark greenish black crystals of giniite on matrix.
Location: Sandamab, Usakos, Namibia. Scale: Picture size 1.3 mm.
© Thomas Witzke / Abraxas-Verlag

Giniite Crystallography

Axial Ratios:

a:b:c =2.7664:1:2.0095

Cell Dimensions:

a = 14.253, b = 5.152, c = 10.353, Z = 2; beta = 111.3° V = 708.31 Den(Calc)= 3.42

Crystal System:

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

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

By Intensity(I/I_o): 3.36(1), 2.04(0.7), 3.2(0.7),

Physical Properties of Giniite

Cleavage:

None

Color:

Blackish brown, Black, Blackish green.

Density:

3.41

Diaphaniety:

Translucent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Crystalline - Fine - Occurs as well-formed fine sized crystals.

Hardness:

3-4 - Calcite-Fluorite

Luster:

Vitreous - Greasy

Streak:

olive green

Optical Properties of Giniite

Optical Data:

Biaxial (-), a=1.775, b=1.803, g=1.812, bire=0.0370, 2V(Calc)=58, 2V(Meas)=55.

Pleochroism (x):

light brown.

Pleochroism (y):

dark brown.

Pleochroism (z):

dark blue green.

Calculated Properties of Giniite

Electron Density:

r_electron=3.34 gm/cc
note: r_Giniite=3.42 gm/cc.

Fermion Index

Fermion Index = 0.00833
Boson Index = 0.99167

Photoelectric:

PE_Giniite= 12.26 barns/electron
U=PE_Giniite x r_electron= 40.93 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Giniite is Not Radioactive

Giniite Classification

Dana Class:

42.11.7.1 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.11)where (AB)4 (XO4)3 Zq · x(H2O)

(42.11.7)Dana Group

42.11.7.1 Giniite FeFe4(PO4)4(OH)2·2(H2O) P 2/a 2/m

Strunz Class:

VII/D.03-10 VII - Phosphates, Arsenates and Vanadates

VII/D - Water-bearing phosphates with unfamiliar anions, cations of medium size: Cu, Zn, Mn, Al, Fe

VII/D.03 - Giniite - Schoonerite series

VII/D.03-05 Gladiusite! Fe2(Fe,Mg)4(PO4)(OH)13·H2O P 2₁/n 2/m

VII/D.03-10 Giniite FeFe4(PO4)4(OH)2·2(H2O) P 2/a 2/m

VII/D.03-15 Kaluginite* (Mn,Ca)MgFe(PO4)2(OH)·4(H2O) C cca 2/m 2/m 2/m

VII/D.03-20 Landesite (Mn,Mg)9Fe3(PO4)8(OH)3·9(H2O) Pmna 2/m 2/m 2/m

VII/D.03-30 Schoonerite Fe2ZnMnFe(PO4)3(OH)2·9(H2O) Pmab 2/m 2/m 2/m

Other Giniite Information

References:

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

See Also:

Links to other databases for Giniite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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Giniite

Fe++Fe+++4(PO4)4(OH)2·2(H2O)
Dana No: 42.11.7.1 Strunz No: VII/D.03-10
Locality:

Notes: