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Giniite

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Big Photo

Sandamab pegmatite (Sandamap pegmatite), Usakos, Karibib District, Erongo Region, Namibia
© Thomas Witzke

Show Giniite Photos (2)



Formula:
Fe
2+
 
Fe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
 · 2H
 
2
O
System:MonoclinicHardness:3 - 4
This page provides mineralogical data about Giniite.

Classification of Giniite

IMA status:Approved 1977
Strunz 8th edition ID:7/D.03-10
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:42.11.7.1

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

19 : Phosphates
13 : Phosphates of Fe alone
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Type Occurrence of Giniite

Type Locality:Sandamab pegmatite (Sandamap pegmatite), Usakos, Karibib District, Erongo Region, Namibia
Year of Discovery:1980

Physical Properties of Giniite

Hardness (Mohs):3 - 4

Crystallography of Giniite

Crystal System:Monoclinic

Optical Data of Giniite

Type:Biaxial (-)
RI values: nα = 1.775 nβ = 1.803 nγ = 1.812
2V:Measured: 55° , Calculated: 58°
Maximum Birefringence:δ = 0.037

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:low

Chemical Properties of Giniite

Formula:
Fe
2+
 
Fe
3+
4
(PO
 
4
)
 
3
(OH)
 
5
 · 2H
 
2
O
Essential elements:Fe, H, O, P
All elements listed in formula:Fe, H, O, P

Relationship of Giniite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
8.DB.05Diadochite
Fe
3+
2
(PO
 
4
)(SO
 
4
)(OH) · 5H
 
2
O
8.DB.05Pitticite
(Fe, SO
 
4
, AsO
 
4
, H
 
2
O) ?
8.DB.05Destinezite
Fe
3+
2
(PO
 
4
)(SO
 
4
)(OH) · 6H
 
2
O
8.DB.10Vashegyite
Al
 
11
(PO
 
4
)
 
9
(OH)
 
6
 · 38H
 
2
O
8.DB.15Schoonerite
ZnMn
2+
 
Fe
2+
2
Fe
3+
 
(PO
 
4
)
 
3
(OH)
 
2
 · 9H
 
2
O
8.DB.20Sinkankasite
H
 
2
Mn
2+
 
Al(PO
 
4
)
 
2
(OH) · 6H
 
2
O
8.DB.25Mitryaevaite
Al
 
6
(PO
 
4
)((P,S)O
 
3
(OH,O))
 
2
F
 
2
(OH)
 
2
 · 14.5H
 
2
O
8.DB.30Sanjuanite
Al
 
2
(PO
 
4
)(SO
 
4
)(OH) · 9H
 
2
O
8.DB.35Sarmientite
Fe
3+
2
(AsO
 
4
)(SO
 
4
)(OH) · 5H
 
2
O
8.DB.40Bukovskýite
Fe
3+
2
(AsO
 
4
)(SO
 
4
)(OH) · 7H
 
2
O
8.DB.45Zýkaite
Fe
3+
4
(AsO
 
4
)
 
3
(SO
 
4
)(OH) · 15H
 
2
O
8.DB.55Sasaite
(Al,Fe
3+
 
)
 
14
(PO
 
4
)
 
11
(SO
 
4
)(OH)
 
7
 · 83H
 
2
O
8.DB.60Mcauslanite
HFe
2+
3
Al
 
2
(PO
 
4
)
 
4
F · 18H
 
2
O
8.DB.65Goldquarryite
CuCd
 
2
Al
 
3
(PO
 
4
)
 
4
F
 
2
(H
 
2
O,F)
 
2
 · 10H
 
2
O
8.DB.70Birchite
Cd
 
2
Cu
 
2
(PO
 
4
)
 
2
(SO
 
4
) · 5H
 
2
O
8.DB.75Braithwaiteite
NaCu
 
5
Ti
 
2
Sb
 
2
(AsO
 
4
)(HAsO
 
4
)
 
2
O
 
2
 · 8H
 
2
O
Related Minerals - Hey's Index Grouping:

- +
19.13.1Barbosalite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
19.13.2Strengite
FePO
 
4
 · 2H
 
2
O
19.13.3Phosphosiderite
FePO
 
4
 · 2H
 
2
O
19.13.4Dufrénite
Ca
 
0.5
Fe
2+
 
Fe
3+
5
(PO
 
4
)
 
4
(OH)
 
6
 · 2H
 
2
O
19.13.6Whitmoreite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
 · 4H
 
2
O
19.13.7Tinticite
Fe
3+
5.34
(PO
 
4
)
 
3.62
(VO
 
4
)
 
0.38
(OH)
 
4
 · 6.7H
 
2
O
19.13.8Ferristrunzite
Fe
3+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
3
 · 5H
 
2
O
19.13.9Ferrostrunzite
Fe
2+
 
Fe
3+
2
(PO
 
4
)
 
2
(OH)
 
2
 · 6H
 
2
O
19.13.10Beraunite
Fe
2+
 
Fe
3+
5
(PO
 
4
)
 
4
(OH)
 
5
 · 4H
 
2
O
19.13.11Vivianite
Fe
2+
3
(PO
 
4
)
 
2
 · 8H
 
2
O
19.13.12Metavivianite
Fe
2+
3-x
Fe
3+
x
(PO
 
4
)
 
2
(OH)x · (8-x)H
 
2
O

Other Names for Giniite

Synonyms:
IMA1977-017
Other Languages:
German:Giniit
Spanish:Giniita

Other Information

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

References for Giniite

Reference List:

- +
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 Giniite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Giniite details from Handbook of Mineralogy (PDF)
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    • Localities for Giniite

    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Thuringia
      • Thuringian Forest
        • Reichmannsdorf
          • Schmiedefeld
    		Ullrich, B. & Ullrich, B. (2010): Der Aufschluss 61, 75-79.
    Namibia
     
    • Erongo Region
      • Karibib District
        • Usakos
    		Neues Jahrb.Min.,Mh.(1980) 49-56 and 561-563
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