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Gamagarite

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Molinello Mine, Graveglia Valley, Ne, Genova Province, Liguria, Italy
© G. Armellino

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Formula:
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)[OH|(VO
 
4
)
 
2
]
System:MonoclinicHardness:4½ - 5
This page provides mineralogical data about Gamagarite.

Classification of Gamagarite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:7/B.24-20
Nickel-Strunz 10th (pending) edition ID:8.BG.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
Dana 8th edition ID:41.10.4.3

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
10 : (AB)3(XO4)2Zq
Hey's CIM Ref.:21.2.16

21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba
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Type Occurrence of Gamagarite

Type Locality:Gamagara Ridge, Gloucester Farm, Postmasburg manganese field, Northern Cape Province, South Africa
Year of Discovery:1943

Physical Properties of Gamagarite

Hardness (Mohs):4½ - 5

Crystallography of Gamagarite

Crystal System:Monoclinic
Cell Parameters:a = 9.15Å, b = 6.17Å, c = 7.88Å
β = 112.7°
Ratio:a:b:c = 1.483 : 1 : 1.277
Unit Cell Volume:V 410.41 ų (Calculated from Unit Cell)

Optical Data of Gamagarite

Type:Biaxial (+)
RI values: nα = 2.016 nβ = 2.040 nγ = 2.130
2V:Measured: 46° to 62°, Calculated: 58°
Maximum Birefringence:δ = 0.114

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

Chemical Properties of Gamagarite

Formula:
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)[OH|(VO
 
4
)
 
2
]
Essential elements:Ba, Fe, H, O, V
All elements listed in formula:Ba, Fe, H, Mn, O, V

Relationship of Gamagarite to other Species

Member of Group:
Brackebuschite Group:
M
2+
2
M
3+
 
[OH|(TO
 
4
)
 
2
]
Related Minerals - Nickel-Strunz Grouping):

- +
8.BG.05Arsentsumebite
Pb
 
2
Cu[OH|SO
 
4
|AsO
 
4
]
8.BG.05Bearthite
Ca
 
2
Al[OH|(PO
 
4
)
 
2
]
8.BG.05Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Goedkenite
(Sr,Ca)
 
2
Al[OH|(PO
 
4
)
 
2
]
8.BG.05UM1994-19-PO:CuHMoPb
Pb
 
2
CuOHPO
 
4
(Mo,As,Cr,Ga)O
 
4
8.BG.05Tsumebite
Pb
 
2
Cu[OH|SO
 
4
|PO
 
4
]
8.BG.05Arsenbrackebuschite
Pb
 
2
(Fe
3+
 
,Zn
2+
 
)[(OH,H
 
2
O)|(AsO
 
4
)
 
2
]
8.BG.05Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)[OH|SO
 
4
|AsO
 
4
]
8.BG.05Bushmakinite
Pb
 
2
Al[OH|PO
 
4
|VO
 
4
]
8.BG.05Tokyoite
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)[OH|(VO
 
4
)
 
2
]
8.BG.05Calderónite
Pb
 
2
Fe
3+
 
[OH|(VO
 
4
)
 
2
]
8.BG.10Mélonjosephite
CaFe
2+
 
Fe
3+
 
[OH|(PO
 
4
)
 
2
]
8.BG.15Tancoite
LiNa
 
2
Al[OH|HPO
 
4
|PO
 
4
]
Related Minerals - Hey's Index Grouping:

- +
21.2.1Metarossite
Ca[V
 
2
O
 
6
] · 2H
 
2
O
21.2.2Rossite
Ca[V
 
2
O
 
6
] · 4H
 
2
O
21.2.3Metahewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 3H
 
2
O
21.2.4Hewettite
Ca[V
 
2
O
 
6
|V
 
4
O
 
10
] · 9H
 
2
O
21.2.5Pintadoite
Ca
 
2
V
 
2
O
 
7
·9H
 
2
O
21.2.6Hendersonite
(Ca,Sr)
 
x
(V
5+
 
,V
4+
 
)
 
12
O
 
32
·12H
 
2
O (x about 2.6)
21.2.7Fernandinite
(Ca,K)[(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
4
O
 
10
]
 
2
 · 4H
 
2
O
21.2.8Pascoite
Ca
 
3
[V
 
10
O
 
28
] · 17H
 
2
O
21.2.9Sherwoodite
Ca
 
9
Al
 
2
V
 
4
V
 
24
O
 
80
·56H
 
2
O
21.2.10Melanovanadite
Ca
 
2
V
 
4
V
 
6
O
 
25
·nH
 
2
O
21.2.11Grantsite
(Na
 
2
,Ca)[V
 
2
O
 
6
|(V
5+
 
,V
4+
 
)
 
4
O
 
10
] · 4H
 
2
O
21.2.12Hummerite
K
 
2
Mg
 
2
[V
 
10
O
 
28
] · 16H
 
2
O
21.2.13Metadelrioite
CaSr[(OH)
 
2
|V
 
2
O
 
6
]
21.2.14Delrioite
CaSr[(OH)
 
2
|V
 
2
O
 
6
] · 3H
 
2
O
21.2.15Straczekite
(Ca,K,Ba)V
 
8
O
 
20
·3H
 
2
O

Other Names for Gamagarite

Other Languages:
German:Gamagarit
Russian:Гамагарит
Spanish:Gamagarita

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 Gamagarite

Reference List:de Villiers, J. E. (1943): Gamagarite, a new vanadium mineral from the Postmasburg manganese deposits. American Mineralogist: 28, 329-335.

Harlow, G. E., Dunn, P. J. and Rossman, G. R. (1984): Gamagarite: a re-examination and comparison with brackebuschite-like minerals. American Mineralogist: 69, 803-806 (503-505 ?).

Basso, R., Zefiro, L. and Palenzona, A. (1987): Gamagarite: new occurrence and crystal structure refinement. Neues Jahrbuch für Mineralogie, Monatshefte (1987): 295-304.

Internet Links for Gamagarite

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    Localities for Gamagarite

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