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Gamagarite

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About GamagariteHide

Formula:
Ba2Fe3+(VO4)2(OH)
Colour:
dark brown to black
Lustre:
Adamantine
Hardness:
4½ - 5
Specific Gravity:
4.62
Crystal System:
Monoclinic
Name:
After the type locality.
This page provides mineralogical data about Gamagarite.


Classification of GamagariteHide

Approved, 'Grandfathered' (first described prior to 1959)
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
41.10.4.3

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

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

Physical Properties of GamagariteHide

Adamantine
Transparency:
Transparent
Colour:
dark brown to black
Streak:
reddish brown
Hardness:
4½ - 5 on Mohs scale
Cleavage:
Distinct/Good
{001} and {100}, distinct; {101} difficult
Density:
4.62 g/cm3 (Measured)    4.72 g/cm3 (Calculated)

Optical Data of GamagariteHide

Type:
Biaxial (+)
RI values:
nα = 2.016 nβ = 2.040 nγ = 2.130
2V:
Measured: 46° to 62°, Calculated: 58°
Max Birefringence:
δ = 0.114
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
relatively weak
Pleochroism:
Visible
Comments:
X:red-brown.
Y:very deep red-brown.
Z:light salmon-buff

Chemical Properties of GamagariteHide

Formula:
Ba2Fe3+(VO4)2(OH)

Crystallography of GamagariteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/m
Setting:
P21/m
Cell Parameters:
a = 9.15 Å, b = 6.17 Å, c = 7.88 Å
β = 112.7°
Ratio:
a:b:c = 1.483 : 1 : 1.277
Unit Cell V:
410.41 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of GamagariteHide

Place of Conservation of Type Material:
The Natural History Museum, London, England, 1958,553; National Museum of Natural History, Washington, D.C., USA, 105142

Other Language Names for GamagariteHide

Relationship of Gamagarite to other SpeciesHide

Other Members of this group:
ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m
BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
CanosioiteBa2Fe3+(AsO4)2(OH)Mon. 2/m : P21/m
FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
FerribushmakinitePb2Fe3+(PO4)(VO4)(OH)Mon. 2/m : P21/m
GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
GrandaiteSr2Al(AsO4)2(OH)Mon. 2/m : P21/m
LombardoiteBa2Mn3+(AsO4)2(OH)Mon. 2/m : P21/m
TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
Unnamed (possible ordered As-analogue of Tokyoite)Ba2Mn[(As,V)O4]2(OH)Mon. 2/m : P21/m

Common AssociatesHide

Associated Minerals Based on Photo Data:
Galena1 photo of Gamagarite associated with Galena on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

8.BG.CanosioiteBa2Fe3+(AsO4)2(OH)Mon. 2/m : P21/m
8.BG.05ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m
8.BG.05BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
8.BG.05UM1994-19-PO:CuHMoPbPb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH)
8.BG.05TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
8.BG.05FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
8.BG.05BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
8.BG.05TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.10MélonjosephiteCaFe2+Fe3+(PO4)2(OH)
8.BG.15TancoiteLiNa2Al(PO4)(HPO4)(OH)Orth. mmm (2/m 2/m 2/m) : Pbca

Related Minerals - Dana Grouping (8th Ed.)Hide

41.10.4.1GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
41.10.4.2BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

21.2.1MetarossiteCa(V2O6) · 2H2OTric. 1 : P1
21.2.2RossiteCa(VO3)2•4H2OTric. 1 : P1
21.2.3MetahewettiteCaV6O16 · 3H2OMon. 2/m
21.2.4HewettiteCaV6O16 · 9H2OMon. 2/m : P21/m
21.2.5PintadoiteCa2(V2O7) · 9H2O
21.2.6Hendersonite(Ca,Sr)1.3V6O16 · 6H2OOrth.
21.2.7Fernandinite(Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2OMon. 2/m : B2/m
21.2.8PascoiteCa3(V10O28) · 17H2OMon. 2 : B2
21.2.9SherwooditeCa4.5(AlV4+2V5+12O40) · 28H2OTet. 4/mmm (4/m 2/m 2/m) : I41/amd
21.2.10MelanovanaditeCa(V5+,V4+)4O10 · 5H2OTric. 1 : P1
21.2.11Grantsite(Na,Ca)2+x(V5+,V4+)6O16 · 4H2OMon.
21.2.12HummeriteK2Mg2(V10O28) · 16H2OTric.
21.2.13MetadelrioiteCaSr(V2O6)(OH)2Tric.
21.2.14DelrioiteCaSr(V2O6)(OH)2 · 3H2OMon.
21.2.15Straczekite(Ca,K,Ba)(V5+,V4+)8O20 · 3H2OMon.

Other InformationHide

Magnetism:
Ferromagnetic
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 GamagariteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 GamagariteHide

Localities for GamagariteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Austria
 
  • Tyrol
    • North Tyrol
      • Sill valley (Wipp valley)
        • Obernberg valley
Kolitsch, U., Schachinger, T. & Auer, C. (2018): 2076) Aegirin, Aegirin-Augit, Albit, Baddeleyit, Baryt, Brandtit(?), Braunit, Calcit, Canosioit, Clinosuenoit (ehemals „Manganocummingtonit“), Coelestin, Diaspor, Dolomit, Fluorapatit (As-haltig), Fluorcalcioroméit, Gamagarit, Hämatit, Hausmannit, Hjalmarit, Hollandit, Hydroxycalcioroméit, Klinochlor, Kutnohorit, Mischkristalle Manganiandrosit-(La) - Manganiakasakait-(La), Nambulit, Phlogopit, Piemontit, Pyrobelonit, Sb-haltiger Pyrophanit, Quarz, Ranciéit(?), Rhodochrosit, Rhodonit, Richterit, Rutil, Spessartin, Talk, Thorit, Tremolit, Tilasit, Titanit, Tokyoit, Wakefieldit-(Ce), Wakefieldit-(Y), Zirkon, das Sb-Analogon von Hydroxymanganopyrochlor und unbenanntes LaAsO4 vom Obernberger Tribulaun, Nordtirol - ein erster Bericht über mineralogisch komplexe, linsenförmige metamorphe Manganvererzungen. Pp. 206-213 in Walter, F. et al. (2018): Neue Mineralfunde aus Österreich LXVII. Carinthia II, 208./128., 185-254.
Italy
 
  • Liguria
    • Genova and La Spezia Provinces
      • Tre Monti mining concession
        • Castiglione Chiavarese and Maissana
analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
    • Genova Province
      • Ne
        • Graveglia Valley
[MinRec 32:354]
          • Reppia
MinRec 32:365
    • La Spezia Province
      • Vara Valley
        • Borghetto Vara
Balestra, C. (2006): Tutto (o quasi) il vanadio della Liguria a giugno 2006. Micro, 4, 55-82.
  • Piedmont
    • Cuneo Province
      • Maira Valley
        • Canosio
          • Vallone della Valletta
Bracco R. (2014) Sempre novità "estere". Segnalazioni in breve. Prie, 10, 48; Cámara, F., Bittarello, E., Ciriotti, M.E., Nestola, F., Radica, F., Marchesini, M. (2015) Arsenic-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: II. Braccoite, NaMn2+5[Si5AsO17(OH)](OH), description and crystal structure. Mineralogical Magazine, 79, 171-189; Cámara, F., Bittarello, E., Ciriotti, M.E., Nestola, F., Radica, F., Massimi, F., Balestra, C., Bracco, R. (2017a) As-bearing new mineral species from Valletta mine, Maira Valley, Piedmont, Italy: III. Canosioite, Ba2Fe3+(AsO4)2(OH), description and crystal structure. Mineralogical Magazine, 81, 305–317.
Japan
 
  • Honshu Island
    • Kanto Region
      • Tokyo Metropolis
        • Nishi-Tama-gun
          • Okutama-cho
Matsubara, S. et al (2004) Journal of Mineralogical and Petrological Sciences, 99, 363-367.
South Africa (TL)
 
  • Northern Cape Province
    • Postmasburg manganese field
      • Gloucester Farm
Amer.Min.(1943) 28, 329-335; The Manganese Adventure: The South African Manganese Fields
      • Western Belt
Mineralogical Magazine (1997): 61: 213-231; Gutzmer, J. (1996). Genesis and alteration of the Kalahari and Postmasburg manganese deposits, Griqualand West, South Africa (Doctoral dissertation, Rand Afrikaans University).
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