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Gamagarite

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Big Photo

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

Show Gamagarite Photos (6)



Formula:
Ba
 
2
(Fe
3+
 
,Mn
3+
 
)(VO
 
4
)
 
2
(OH)
System:MonoclinicHardness:4½ - 5
Member of:Brackebuschite Group
Name:After the type locality.
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, 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+
 
)(VO
 
4
)
 
2
(OH)
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:Brackebuschite Group
Other Members of Group:

- +
Arsenbrackebuschite
Pb
 
2
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
Arsentsumebite
Pb
 
2
Cu(AsO
 
4
)(SO
 
4
)(OH)
Bearthite
Ca
 
2
Al(PO
 
4
)
 
2
(OH)
Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
Bushmakinite
Pb
 
2
Al(PO
 
4
)(VO
 
4
)(OH)
Calderónite
Pb
 
2
Fe
3+
 
(VO
 
4
)
 
2
(OH)
Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)(AsO
 
4
)(SO
 
4
)(OH)
Goedkenite
(Sr,Ca)
 
2
Al(PO
 
4
)
 
2
(OH)
Tokyoite
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
Tsumebite
Pb
 
2
Cu(PO
 
4
)(SO
 
4
)(OH)
Related Minerals - Nickel-Strunz Grouping):

- +
8.BG.05Arsentsumebite
Pb
 
2
Cu(AsO
 
4
)(SO
 
4
)(OH)
8.BG.05Bearthite
Ca
 
2
Al(PO
 
4
)
 
2
(OH)
8.BG.05Brackebuschite
Pb
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
8.BG.05Goedkenite
(Sr,Ca)
 
2
Al(PO
 
4
)
 
2
(OH)
8.BG.05UM1994-19-PO:CuHMoPb
Pb
 
2
Cu(PO
 
4
)(MoO
 
4
,AsO
 
4
,CrO
 
4
,GaO
 
4
)(OH)
8.BG.05Tsumebite
Pb
 
2
Cu(PO
 
4
)(SO
 
4
)(OH)
8.BG.05Arsenbrackebuschite
Pb
 
2
Fe
3+
 
(AsO
 
4
)
 
2
(OH)
8.BG.05Feinglosite
Pb
 
2
(Zn,Fe
2+
 
)(AsO
 
4
)(SO
 
4
)(OH)
8.BG.05Bushmakinite
Pb
 
2
Al(PO
 
4
)(VO
 
4
)(OH)
8.BG.05Tokyoite
Ba
 
2
(Mn
3+
 
,Fe
3+
 
)(VO
 
4
)
 
2
(OH)
8.BG.05Calderónite
Pb
 
2
Fe
3+
 
(VO
 
4
)
 
2
(OH)
8.BG.10Mélonjosephite
CaFe
2+
 
Fe
3+
 
(PO
 
4
)
 
2
(OH)
8.BG.15Tancoite
LiNa
 
2
Al(PO
 
4
)(HPO
 
4
)(OH)
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
CaV
 
6
O
 
16
 · 3H
 
2
O
21.2.4Hewettite
CaV
 
6
O
 
16
 · 9H
 
2
O
21.2.5Pintadoite
Ca
 
2
(V
 
2
O
 
7
) · 9H
 
2
O
21.2.6Hendersonite
(Ca,Sr)
 
1.3
V
 
6
O
 
16
 · 6H
 
2
O
21.2.7Fernandinite
(Ca,K)(V
5+
 
,V
4+
 
,Fe
2+
 
)
 
8
O
 
20
 · 10H
 
2
O
21.2.8Pascoite
Ca
 
3
(V
 
10
O
 
28
) · 17H
 
2
O
21.2.9Sherwoodite
Ca
 
4.5
(AlV
4+
2
V
5+
12
O
 
40
) · 28H
 
2
O
21.2.10Melanovanadite
Ca
 
2
(V
5+
 
,V
4+
 
)
 
4
O
 
10
 · 5H
 
2
O
21.2.11Grantsite
(Na,Ca)V
 
6
O
 
16
 · 4H
 
2
O
21.2.12Hummerite
K
 
2
Mg
 
2
(V
 
10
O
 
28
) · 16H
 
2
O
21.2.13Metadelrioite
CaSr(V
 
2
O
 
6
)(OH)
 
2
21.2.14Delrioite
CaSr(V
 
2
O
 
6
)(OH)
 
2
 · 3H
 
2
O
21.2.15Straczekite
(Ca,K,Ba)(V
5+
 
,V
4+
 
)
 
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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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Gamagarite details from Handbook of Mineralogy (PDF)
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    • Localities for Gamagarite

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
    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.
    Italy
     
    • Liguria
      • Genova Province
        • Ne
          • Graveglia Valley
    		[MinRec 32:354]
            • Reppia
    		MinRec 32:365
      • La Spezia Province
        • Vara Valley
          • Borghetto Vara
    Japan
     
    • Honshu Island
      • Kanto Region
        • Tokyo Prefecture
          • Nishi-Tama-gun
            • Okutama-cho
    		Matsubara, S. et al (2004) Journal of Mineralogical and Petrological Sciences, 99, 363-367.
    South Africa
     
    • Northern Cape Province
      • Postmasburg
    		Mineralogical Magazine (1997): 61: 213-231
        • Gloucester Farm
    		Amer.Min.(1943) 28, 329-335; The Manganese Adventure: The South African Manganese Fields
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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