Gamagarite
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About Gamagarite
Formula:
Ba2Fe3+(VO4)2(OH)
Colour:
dark brown to black
Lustre:
Adamantine
Hardness:
4½ - 5
Specific Gravity:
4.62
Crystal System:
Monoclinic
Member of:
Name:
After the type locality.
This page provides mineralogical data about Gamagarite.
Classification of Gamagarite
Approved, 'Grandfathered' (first described prior to 1959)
7/B.24-20
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
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
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
21 : Vanadates (and vanadates with arsenate or phosphate)
2 : Vanadates of Mg, Ca, Sr or Ba
Physical Properties of Gamagarite
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
{001} and {100}, distinct; {101} difficult
Density:
4.62 g/cm3 (Measured) 4.72 g/cm3 (Calculated)
Optical Data of Gamagarite
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.
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
Y:very deep red-brown.
Z:light salmon-buff
Chemical Properties of Gamagarite
Formula:
Ba2Fe3+(VO4)2(OH)
Crystallography of Gamagarite
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°
β = 112.7°
Ratio:
a:b:c = 1.483 : 1 : 1.277
Unit Cell V:
410.41 ų (Calculated from Unit Cell)
Z:
2
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014817 | Gamagarite | Basso R, Palenzona A, Zefiro L (1987) Gamagarite: new occurrence and crystal structure refinement Neues Jahrbuch fur Mineralogie, Monatshefte 1987 295-304 | 1987 | a manganese ore deposit at Molinello mine, Val Graveglia, Eastern Liguria, Italy | 0 | 293 |
CIF Raw Data - click here to close
Type Occurrence of Gamagarite
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 Gamagarite
Relationship of Gamagarite to other Species
Member of:
Other Members of this group:
Arsenbrackebuschite | Pb2Fe3+(AsO4)2(OH) | Mon. 2/m : P2/m |
Arsentsumebite | Pb2Cu(AsO4)(SO4)(OH) | Mon. 2/m : P21/m |
Bearthite | Ca2Al(PO4)2(OH) | Mon. 2/m : P21/m |
Brackebuschite | Pb2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
Bushmakinite | Pb2Al(PO4)(VO4)(OH) | Mon. 2/m : P21/m |
Calderónite | Pb2Fe3+(VO4)2(OH) | Mon. 2/m : P21/m |
Canosioite | Ba2Fe3+(AsO4)2(OH) | Mon. 2/m : P21/m |
Feinglosite | Pb2Zn(AsO4)2 · H2O | Mon. 2/m |
Ferribushmakinite | Pb2Fe3+(PO4)(VO4)(OH) | Mon. 2/m : P21/m |
Goedkenite | Sr2Al(PO4)2(OH) | Mon. 2/m : P21/m |
Grandaite | Sr2Al(AsO4)2(OH) | Mon. 2/m : P21/m |
Lombardoite | Ba2Mn3+(AsO4)2(OH) | Mon. 2/m : P21/m |
Tokyoite | Ba2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
Tsumebite | Pb2Cu(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 Associates
Related Minerals - Nickel-Strunz Grouping
8.BG. | Canosioite | Ba2Fe3+(AsO4)2(OH) | Mon. 2/m : P21/m |
8.BG.05 | Arsentsumebite | Pb2Cu(AsO4)(SO4)(OH) | Mon. 2/m : P21/m |
8.BG.05 | Bearthite | Ca2Al(PO4)2(OH) | Mon. 2/m : P21/m |
8.BG.05 | Brackebuschite | Pb2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
8.BG.05 | Goedkenite | Sr2Al(PO4)2(OH) | Mon. 2/m : P21/m |
8.BG.05 | UM1994-19-PO:CuHMoPb | Pb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH) | |
8.BG.05 | Tsumebite | Pb2Cu(PO4)(SO4)(OH) | Mon. 2/m : P21/m |
8.BG.05 | Arsenbrackebuschite | Pb2Fe3+(AsO4)2(OH) | Mon. 2/m : P2/m |
8.BG.05 | Feinglosite | Pb2Zn(AsO4)2 · H2O | Mon. 2/m |
8.BG.05 | Bushmakinite | Pb2Al(PO4)(VO4)(OH) | Mon. 2/m : P21/m |
8.BG.05 | Tokyoite | Ba2Mn3+(VO4)2(OH) | Mon. 2/m : P21/m |
8.BG.05 | Calderónite | Pb2Fe3+(VO4)2(OH) | Mon. 2/m : P21/m |
8.BG.10 | Mélonjosephite | CaFe2+Fe3+(PO4)2(OH) | Orth. mmm (2/m 2/m 2/m) : Pbam |
8.BG.15 | Tancoite | LiNa2Al(PO4)(PO3OH)(OH) | Orth. mmm (2/m 2/m 2/m) : Pbca |
Related Minerals - Dana Grouping (8th Ed.)
41.10.4.1 | Goedkenite | Sr2Al(PO4)2(OH) | Mon. 2/m : P21/m |
41.10.4.2 | Bearthite | Ca2Al(PO4)2(OH) | Mon. 2/m : P21/m |
Related Minerals - Hey's Chemical Index of Minerals Grouping
21.2.1 | Metarossite | Ca(V2O6) · 2H2O | Tric. 1 : P1 |
21.2.2 | Rossite | Ca(VO3)2 · 4H2O | Tric. 1 : P1 |
21.2.3 | Metahewettite | CaV6O16 · 3H2O | Mon. 2/m |
21.2.4 | Hewettite | CaV6O16 · 9H2O | Mon. 2/m : P21/m |
21.2.5 | Pintadoite | Ca2(V2O7) · 9H2O | |
21.2.6 | Hendersonite | (Ca,Sr)1.3V6O16 · 6H2O | Orth. |
21.2.7 | Fernandinite | (Ca,K)(V5+,V4+,Fe2+)8O20 · 10H2O | Mon. 2/m : B2/m |
21.2.8 | Pascoite | Ca3(V10O28) · 17H2O | Mon. 2 : B2 |
21.2.9 | Sherwoodite | Ca4.5(AlV4+2V5+12O40) · 28H2O | Tet. 4/mmm (4/m 2/m 2/m) : I41/amd |
21.2.10 | Melanovanadite | Ca(V5+,V4+)4O10 · 5H2O | Tric. 1 : P1 |
21.2.11 | Grantsite | (Na,Ca)2+x(V5+,V4+)6O16 · 4H2O | Mon. 2/m : P21/m |
21.2.12 | Hummerite | K2Mg2(V10O28) · 16H2O | Tric. |
21.2.13 | Metadelrioite | CaSr(V2O6)(OH)2 | Tric. |
21.2.14 | Delrioite | CaSr(V2O6)(OH)2 · 3H2O | Mon. |
21.2.15 | Straczekite | (Ca,K,Ba)(V5+,V4+)8O20 · 3H2O | Mon. |
Other Information
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 Gamagarite
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 Gamagarite
mindat.org URL:
https://www.mindat.org/min-1645.html
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Localities for Gamagarite
Locality List




All localities listed without proper references should be considered as questionable.
Austria | |
| 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 | |
| Marchesini, M., Pagano, R. (2001) The Val Graveglia manganese district, Liguria, Italy. The Mineralogical Record: 32: 349-379; 415. |
| MinRec 32:365 |
| Balestra, C. (2006): Tutto (o quasi) il vanadio della Liguria a giugno 2006. Micro, 4, 55-82. |
| analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA |
| 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 | |
| Matsubara, S. et al (2004) Journal of Mineralogical and Petrological Sciences, 99, 363-367. |
South Africa (TL) | |
| Amer.Min.(1943) 28, 329-335; The Manganese Adventure: The South African Manganese Fields |
| Costin, G., Fairey, B., & Tsikos, H. (2014) Tokyoite and As-rich tokyoite: new occurrence in the manganese ore of the Postmasburg Manganese Field, South Africa. 21st annual IMA conference |
| 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). |
Molinello Mine, Ne, Genoa, Liguria, Italy