Giniite
A valid IMA mineral species
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About Giniite
Gini Keller
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 - ].
This page provides mineralogical data about Giniite.
Unique Identifiers
Mindat ID:
1695
Long-form identifier:
mindat:1:1:1695:3
GUID
(UUID V4):
(UUID V4):
b9be341b-1413-47d2-9a12-6dd00c614745
IMA Classification of Giniite
Classification of Giniite
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
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
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
19.13.5
19 : Phosphates
13 : Phosphates of Fe alone
19 : Phosphates
13 : Phosphates of Fe alone
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Gin | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Giniite
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 Giniite
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.
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
low
Optical Extinction:
X = b; Z = c; Y ∧ a ≃ 20°.
Pleochroism:
Strong
Comments:
X = light brown, Y = dark brown, Z = dark blue-green.
Chemistry of Giniite
Mindat Formula:
Fe2+Fe3+4(PO4)3(OH)5 · 2H2O
Elements listed:
Crystallography of Giniite
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°
β = 111.30°
Ratio:
a:b:c = 2.766 : 1 : 2.01
Unit Cell V:
708.31 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Idiomorphic crystals with {010}, {150}, and {041} dominant, also {310}, {001}, {100}.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.36 Å | (100) |
| 3.20 Å | (70) |
| 2.80 Å | (50) |
| 2.28 Å | (60) |
| 2.04 Å | (70) |
| 1.679 Å | (60) |
| 1.604 Å | (60) |
Comments:
Sandamap pegmatite, Namibia. Data from the type description.
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) |
Type Occurrence of Giniite
General Appearance of Type Material:
Small, brilliant black wedge-shaped crystals.
Place of Conservation of Type Material:
Institut für Mineralogie und Kristallchemie, Universität Stuttgart, Stuttgart, Germany, number NM 01 (cotype).
Archiv der Universität Stuttgart, Stuttgart, Germany, number TM-77.17 (holotype).
Archiv der Universität Stuttgart, Stuttgart, Germany, number TM-77.17 (holotype).
Geological Setting of Type Material:
Late stage phosphate mineralization in granite pegmatite.
Associated Minerals at Type Locality:
Synonyms of Giniite
Other Language Names for Giniite
Common Associates
Associated Minerals Based on Photo Data:
| 7 photos of Giniite associated with Tavorite | LiFe3+(PO4)(OH) |
| 2 photos of Giniite associated with Whitlockite | Ca9Mg(PO4)6(PO3OH) |
| 2 photos of Giniite associated with Hureaulite | Mn2+5(PO3OH)2(PO4)2 · 4H2O |
| 1 photo of Giniite associated with Heterosite | (Fe3+,Mn3+)PO4 |
| 1 photo of Giniite associated with Robertsite | Ca2Mn3+3(PO4)3O2 · 3H2O |
| 1 photo of Giniite associated with Phosphosiderite | FePO4 · 2H2O |
Related Minerals - Strunz-mindat Grouping
| 8.DB. | Arangasite | Al2F(PO4)(SO4) · 9H2O |
| 8.DB. | Camaronesite | [Fe3+(H2O)2(PO3OH)]2(SO4) · 1-2H2O |
| 8.DB. | Höslite | Fe3+3(VO4)2(SO4)(OH)(H2O)4 · 3H2O |
| 8.DB.05 | Diadochite | Fe3+2(PO4)(SO4)(OH) · 6H2O |
| 8.DB.05 | Pitticite | (Fe, AsO4, H2O) (?) |
| 8.DB.05 | Destinezite | Fe3+2(PO4)(SO4)(OH) · 6H2O |
| 8.DB.07 | Wilhelmgümbelite | ZnFe2+Fe3+3(PO4)3(OH)4(H2O)5 · 2H2O |
| 8.DB.07 | Schmidite | [Zn2(Fe3+,Mn2+)2Fe3+(PO4)3(OH)3(H2O)6] · 2H2O |
| 8.DB.07 | Wildenauerite | Zn(Fe3+,Mn2+)2MnFe3+(PO4)3(OH)3(H2O)6 · 2H2O |
| 8.DB.10 | Vashegyite | Al11(PO4)9(OH)6 · 38H2O |
| 8.DB.15 | Schoonerite | ZnMn2+Fe2+2Fe3+(PO4)3(OH)2 · 9H2O |
| 8.DB.20 | Sinkankasite | Mn2+Al(PO3OH)2(OH) · 6H2O |
| 8.DB.25 | Mitryaevaite | Al6(PO4)((P,S)O3(OH,O))2F2(OH)2 · 14.5H2O |
| 8.DB.30 | Sanjuanite | Al2(PO4)(SO4)(OH) · 9H2O |
| 8.DB.35 | Sarmientite | Fe3+2(AsO4)(SO4)(OH) · 5H2O |
| 8.DB.40 | Bukovskýite | Fe3+2(AsO4)(SO4)(OH) · 9H2O |
| 8.DB.40 | Flurlite | Zn3Mn2+Fe3+(PO4)3(OH)2 · 9H2O |
| 8.DB.40 | Manganflurlite | ZnMn2+3Fe3+(PO4)3(OH)2(H2O)7 · 2H2O |
| 8.DB.42 | Bohuslavite | Fe3+4(PO4)3(SO4)(OH) · nH2O |
| 8.DB.45 | Zýkaite | Fe3+4(AsO4)3(SO4)(OH) · 15H2O |
| 8.DB.47 | Lapeyreite | Cu3O[AsO3(OH)]2 · 0.75H2O |
| 8.DB.50 | Rossiantonite | Al3(PO4)(SO4)2(OH)2(H2O)14 |
| 8.DB.52 | Arctowskite | Al9(PO4)8(OH)3 · 27H2O |
| 8.DB.55 | Sasaite | (Al,Fe3+)14(PO4)11(SO4)(OH)7 · 83H2O |
| 8.DB.60 | Mcauslanite | Fe3Al2(PO4)3(PO3OH)F · 18H2O |
| 8.DB.65 | Goldquarryite | CuCd2Al3(PO4)4F2(H2O,F)2 · 10H2O |
| 8.DB.70 | Birchite | Cd2Cu2(PO4)2(SO4) · 5H2O |
| 8.DB.75 | Braithwaiteite | NaCu5(Ti4+Sb5+)(AsO4)4(HAsO4)2O2 · 8H2O |
Fluorescence of Giniite
Not fluorescent in UV.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Giniite
mindat.org URL:
https://www.mindat.org/min-1695.html
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References for Giniite
Reference List:
Fleischer, M., Cabri, L. J., Chao, G. Y., Pabst, A. (1980) New mineral names. American Mineralogist, 65. 1065-1070 p.1066
Localities for Giniite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Germany | |
| Ullrich et al. (2010) |
Namibia | |
| von Bezing (2007) |
| Keller (1980) +2 other references |
USA | |
| Silver Coin Mine. Compact Disc. Paul ... |
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Sandamap pegmatite, Sandamap North Farm 115, Dâures Constituency, Erongo Region, Namibia