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Giniite

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About GiniiteHide

Formula:
Fe2+Fe3+4(PO4)3(OH)5 · 2H2O
Colour:
Black, Greenish black, Brownish black
Lustre:
Adamantine, Sub-Adamantine, Vitreous
Hardness:
3 - 4
Specific Gravity:
3.41
Crystal System:
Monoclinic
Name:
Named in 1980 by Paul Keller in honor of his wife Adelheid Gini Keller [1940 - ].
Small, brilliant black wedge-shaped crystals.


Classification of GiniiteHide

Approved
Approval Year:
1977
8.DB.50

8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
B : With only medium-sized cations, (OH, etc.):RO4< 1:1
42.11.7.1

42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
19.13.5

19 : Phosphates
13 : Phosphates of Fe alone

Physical Properties of GiniiteHide

Adamantine, Sub-Adamantine, Vitreous
Transparency:
Translucent
Colour:
Black, Greenish black, Brownish black
Streak:
Dark olive green
Hardness:
3 - 4 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Conchoidal, Sub-Conchoidal
Density:
3.41 g/cm3 (Measured)    3.42 g/cm3 (Calculated)

Optical Data of GiniiteHide

Type:
Biaxial (-)
RI values:
nα = 1.775 nβ = 1.803 nγ = 1.812
2V:
Measured: 55° , Calculated: 58°
Birefringence:
0.037
Max Birefringence:
δ = 0.037
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
low
Optical Extinction:
Y^a ~20°
Pleochroism:
Strong
Comments:
X = light brown, Y = dark brown, Z = dark blue-green

Chemical Properties of GiniiteHide

Formula:
Fe2+Fe3+4(PO4)3(OH)5 · 2H2O
IMA Formula:
Fe2+Fe3+4(PO4)4(OH)2 · 2H2O

Crystallography of GiniiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 14.253 Å, b = 5.152 Å, c = 10.353 Å
β = 111.30°
Ratio:
a:b:c = 2.766 : 1 : 2.01
Unit Cell V:
708.31 ų (Calculated from Unit Cell)
Z:
2

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.36 (100)
3.20 (70)
2.80 (50)
2.28 (60)
2.04 (70)
1.679 (60)
1.604 (60)

Type Occurrence of GiniiteHide

Synonyms of GiniiteHide

Other Language Names for GiniiteHide

German:Giniit
Spanish:Giniita

Common AssociatesHide

Associated Minerals Based on Photo Data:
Tavorite6 photos of Giniite associated with Tavorite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.DB.05DiadochiteFe3+2(PO4)(SO4)(OH) · 5H2OAmor.
8.DB.05Pitticite(Fe, SO4, AsO4, H2O) ?Amor.
8.DB.05DestineziteFe3+2(PO4)(SO4)(OH) · 6H2OTric. 1 : P1
8.DB.10VashegyiteAl11(PO4)9(OH)6 · 38H2OOrth. mmm (2/m 2/m 2/m)
8.DB.15SchooneriteZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2OOrth. mmm (2/m 2/m 2/m) : Pbam
8.DB.20SinkankasiteMn2+Al(PO3OH)2(OH) · 6H2OTric.
8.DB.25MitryaevaiteAl6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2OTric.
8.DB.30SanjuaniteAl2(PO4)(SO4)(OH) · 9H2O
8.DB.35SarmientiteFe3+2(AsO4)(SO4)(OH) · 5H2OMon. 2/m : P21/b
8.DB.40BukovskýiteFe3+2(AsO4)(SO4)(OH) · 9H2OTric. 1 : P1
8.DB.45ZýkaiteFe3+4(AsO4)3(SO4)(OH) · 15H2OOrth.
8.DB.55Sasaite(Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2OOrth.
8.DB.60McauslaniteFe3Al2(PO4)3(PO3OH)F · 18H2OTric.
8.DB.65GoldquarryiteCuCd2Al3(PO4)4F2(H2O,F)2 · 10H2OTric. 1 : P1
8.DB.70BirchiteCd2Cu2(PO4)2(SO4) · 5H2OOrth. mmm (2/m 2/m 2/m) : Pnma
8.DB.75BraithwaiteiteNaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2OTric. 1 : P1

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.13.1BarbosaliteFe2+Fe3+2(PO4)2(OH)2Mon. 2/m : P21/b
19.13.2StrengiteFePO4 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.13.3PhosphosideriteFePO4 · 2H2OMon. 2/m
19.13.4DufréniteCa0.5Fe2+Fe3+5(PO4)4(OH)6 · 2H2OMon. 2/m : B2/b
19.13.6WhitmoreiteFe2+Fe3+2(PO4)2(OH)2 · 4H2OMon. 2/m : P21/b
19.13.7TinticiteFe3+5.34(PO4)3.62(VO4)0.38(OH)4 · 6.7H2OTric. 1 : P1
19.13.8FerristrunziteFe3+Fe3+2(PO4)2(OH)3 · 5H2OTric.
19.13.9FerrostrunziteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric.
19.13.10BerauniteFe2+Fe3+5(PO4)4(OH)5 · 6H2OMon. 2/m : B2/b
19.13.11VivianiteFe2+3(PO4)2 · 8H2OMon. 2/m : B2/m
19.13.12MetavivianiteFe2+Fe3+2(PO4)2(OH)2 · 6H2OTric. 1 : P1

Fluorescence of GiniiteHide

Not fluorescent in UV

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for GiniiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Keller, P. (1980): Giniite, Fe2+Fe43+[(H2O)2|(OH)2|(PO4)4], a new mineral from the pegmatite of Sandamab near Usakos, Namibia. Neues Jahrbuch für Mineralogie, Monatshefte 1980, 49-56. (in German).
Keller, P. (1980): Giniite Fe2+Fe43+[(H2O)2|(OH)2|(PO4)4]: new crystallographic data. Neues Jahrbuch für Mineralogie, Monatshefte 1980, 561-563. (in German).
American Mineralogist: 65: 1066.

Internet Links for GiniiteHide

Localities for GiniiteHide

ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Germany
 
  • Thuringia
    • Thuringian Forest
      • Schmiedefeld
Ullrich, B. & Ullrich, B. (2010): Der Aufschluss 61, 75-79.
Namibia
 
  • Erongo Region
    • Dâures
Von Bezing, L., Bode, R., and Jahn, S., (2008) Namibia Minerals and Localities. Edition Schloss Freudenstein, Bode Verlag GmbH, Haltern. 409 (in English).
Neues Jahrb.Min.,Mh.(1980) 49-56 and 561-563
Mineral and/or Locality  
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