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Giniite Mineral Data

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General Giniite Information

Help on Chemical  Formula: Chemical Formula: Fe++Fe+++4(PO4)4(OH)2•2(H2O)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Fe2+Fe3+4(PO4)4(OH)2•2(H2O)
Help on Environment: Environment: In a pegmatite.
Help on IMA Status: IMA Status: Approved IMA 1980
Help on Locality: Locality: Sandamab, near Usakos, Namibia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named by Paul Keller for his wife, Gini Keller.
Help on Name Pronunciation: Name Pronunciation: Giniite Say GINIITE

Giniite Image

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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

Help on Axial Ratios: Axial Ratios: a:b:c =2.7664:1:2.0095
Help on Cell Dimensions: Cell Dimensions: a = 14.253, b = 5.152, c = 10.353, Z = 2; beta = 111.3° V = 708.31 Den(Calc)= 3.42
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: P 2/a
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.36(1), 2.04(0.7), 3.2(0.7),

Physical Properties of Giniite

Help on Cleavage: Cleavage: None
Help on Color: Color: Blackish brown, Black, Blackish green.
Help on Density: Density: 3.41
Help on Diaphaneity: Diaphaneity: Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Fine - Occurs as well-formed fine sized crystals.
Help on Hardness: Hardness: 3-4 - Calcite-Fluorite
Help on Luster: Luster: Vitreous - Greasy
Help on Streak: Streak: olive green

Optical Properties of Giniite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.076 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.079 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2329,KPDmeas= 0.2336,KC= 0.2529
Ncalc = 1.86 - 1.87
Help on Optical Data: Optical Data: Biaxial (-), a=1.775, b=1.803, g=1.812, bire=0.0370, 2V(Calc)=58, 2V(Meas)=55.
Help on Pleochroism (x): Pleochroism (x): light brown.
Help on Pleochroism (y): Pleochroism (y): dark brown.
Help on Pleochroism (z): Pleochroism (z): dark blue green.

Calculated Properties of Giniite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.33 gm/cc
note: Specific Gravity of Giniite =3.41 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.008330457
Boson Index = 0.991669543
Help on Photoelectric: Photoelectric: PEGiniite = 12.26 barns/electron
U=PEGiniite x rElectron Density= 40.81 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Giniite is Not Radioactive

Giniite Classification

Help on  Dana Class: Dana Class: (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen
  (42.11)where (AB)4 (XO4)3 Zq � x(H2O)
  (42.11.07)Dana Group Giniite FeFe4(PO4)4(OH)2•2(H2O) P 2/a 2/m
Help on  Strunz Class: Strunz Class: 08.DB.50 08 - PHOSPHATES, ARSENATES, VANADATES
  08.D - Phosphates, etc
  08.DB -With only medium-sized cations, (OH, etc.):RO4 < 1:1
08.DB.50 Giniite FeFe4(PO4)4(OH)2•2(H2O) P 2/a 2/m

Other Giniite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)
Help on See Also: 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 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.DB.50





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