General Giniite Information Chemical Formula: |
Fe++Fe+++4(PO4)4(OH)2•2(H2O) |
Composition: |
Molecular Weight = 729.17 gm |
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Iron 38.30 % Fe 9.85 % FeO / 43.80 % Fe2O3 |
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Phosphorus 16.99 % P 38.93 % P2O5 |
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Hydrogen 0.83 % H 7.41 % H2O |
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Oxygen 43.88 % O |
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______ ______ |
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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. |
Name Pronunciation: |
Giniite |
| | Giniite Image
Images:
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 3.36(1), 2.04(0.7), 3.2(0.7), |
Crystal Structure:
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Mouse
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| Physical Properties of Giniite Cleavage: |
None |
Color: |
Blackish brown, Black, Blackish green. |
Density: |
3.41 |
Diaphaneity: |
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 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 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: |
Bulk Density (Electron Density)=3.33 gm/cc |
note: Specific Gravity of Giniite =3.41 gm/cc. Fermion Index: |
Fermion Index = 0.008330457 |
Boson Index = 0.991669543 Photoelectric: |
PEGiniite = 12.26 barns/electron |
U=PEGiniite x rElectron Density= 40.81 barns/cc. Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) |
Giniite is Not Radioactive | Giniite Classification Dana Class: |
42.11.07.01 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.11)where (AB)4 (XO4)3 Zq · x(H2O) |
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(42.11.07)Dana Group |
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Strunz Class: |
08.DB.50 08 - PHOSPHATES, ARSENATES, VANADATES |
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08.D - Phosphates, etc |
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08.DB -With only medium-sized cations, (OH, etc.):RO4 < 1:1 |
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| 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 - 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 Search for Giniite using: Visit our Advertisers for Giniite : A Bijoux Google Search for GiniiteAdam's Minerals Google Search for Giniite Cape Minerals Google Search for Giniite Dakota Matrix Minerals Google Search for Giniite Excalibur Mineral Corp. Google Search for Giniite Exceptional Minerals Google Search for Giniite John Betts Fine Minerals Search for Giniite McDougall Minerals Google Search for Giniite Mineral News Website Link Rock and Mineral Shows Google Search for Giniite Weinrich Minerals, Inc. Google Search for Giniite Ask about Giniite here : Print or Cut-and-Paste your Giniite Specimen Label here :
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