Gamagarite

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Gamagarite

Molinello Mine, Ne, Genoa, Liguria, Italy

Gamagarite

Cerchiara Mine, Borghetto di Vara, La Spezia Province, Liguria, Italy

Gamagarite

Molinello Mine, Ne, Genoa, Liguria, Italy

Gamagarite

Molinello Mine, Ne, Genoa, Liguria, Italy

Gamagarite

Cerchiara Mine, Borghetto di Vara, La Spezia Province, Liguria, Italy

Gamagarite

Molinello Mine, Ne, Genoa, Liguria, Italy

Gamagarite

Molinello Mine, Ne, Genoa, Liguria, Italy

Gamagarite

Cerchiara Mine, Borghetto di Vara, La Spezia Province, Liguria, Italy

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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

Member of:

Brackebuschite Supergroup

Name:

After the type locality.

Type Locality:

ⓘ Gamagara Ridge, Gloucester Farm, Northern Cape, South Africa

This page provides mineralogical data about Gamagarite.

Classification of GamagariteHide

IMA status:

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

Strunz 8th ed.:

7/B.24-20

Nickel-Strunz 10th (pending) ed.:

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 ed.:

41.10.4.3

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

Hey's CIM Ref.:

21.2.16

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

Physical Properties of GamagariteHide

Lustre:

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:

n_α = 2.016 n_β = 2.040 n_γ = 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)

Elements listed:

Ba, Fe, H, O, V - search for minerals with similar chemistry

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 Å³ (Calculated from Unit Cell)

Crystal StructureHide

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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

data_global
_chemical_name_mineral 'Gamagarite'
loop_
_publ_author_name
'Basso R'
'Palenzona A'
'Zefiro L'
_journal_name_full 'Neues Jahrbuch fur Mineralogie, Monatshefte'
_journal_volume 1987 
_journal_year 1987
_journal_page_first 295
_journal_page_last 304
_publ_section_title
;
 Gamagarite: new occurrence and crystal structure refinement
;
_database_code_amcsd 0014817
_chemical_compound_source 'a manganese ore deposit at Molinello mine, Val Graveglia, Eastern Liguria, Italy'
_chemical_formula_sum '(Ba1.8 Sr.2) (Fe.56 Mn.44) (V1.82 As.18) O9 H'
_cell_length_a 9.121
_cell_length_b 6.142
_cell_length_c 7.838
_cell_angle_alpha 90
_cell_angle_beta 112.88
_cell_angle_gamma 90
_cell_volume 404.547
_exptl_crystal_density_diffrn      4.691
_symmetry_space_group_name_H-M 'P 1 21/m 1'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  'x,1/2-y,z'
  '-x,1/2+y,-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Ba1   0.40910   0.75000   0.31980   0.90000   0.00849
Sr1   0.40910   0.75000   0.31980   0.10000   0.00849
Ba2   0.24350   0.75000   0.73590   0.90000   0.01241
Sr2   0.24350   0.75000   0.73590   0.10000   0.01241
Fe   0.00000   0.00000   0.00000   0.56000   0.00659
Mn   0.00000   0.00000   0.00000   0.44000   0.00659
V1   0.82650   0.75000   0.55850   0.91000   0.00659
As1   0.82650   0.75000   0.55850   0.09000   0.00659
V2   0.66540   0.75000   0.95350   0.91000   0.00570
As2   0.66540   0.75000   0.95350   0.09000   0.00570
O1   0.70510   0.96940   0.49750   1.00000   0.01722
O2   0.94600   0.75000   0.44460   1.00000   0.03977
O3   0.95390   0.75000   0.80720   1.00000   0.01963
O4   0.53770   0.75000   0.72740   1.00000   0.03863
O5   0.21780   0.01620   0.00540   1.00000   0.01355
O6   0.55450   0.75000   0.07680   1.00000   0.02191
O7   0.06700   0.75000   0.17490   1.00000   0.01178
H   0.99500   0.75000   0.24500   1.00000 ?

Type Occurrence of GamagariteHide

Type Locality:

ⓘ Gamagara Ridge, Gloucester Farm, Northern Cape, South Africa

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

German:Gamagarit

Russian:Гамагарит

Spanish:Gamagarita

Relationship of Gamagarite to other SpeciesHide

Member of:

Brackebuschite Supergroup

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 AssociatesHide

Associated Minerals Based on Photo Data:

1 photo of Gamagarite associated with Galena

PbS

Related Minerals - Nickel-Strunz Grouping Hide

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.)Hide

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 Hide

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	Ca_4.5(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 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

mindat.org URL:

https://www.mindat.org/min-1645.html
Please feel free to link to this page.

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External Links:

Look for Gamagarite on Webmineral

Look for Gamagarite on Wikipedia

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Raman and XRD data at RRUFF project

References and PDF downloads at RRUFF project

American Mineralogist Crystal Structure Database

Handbook of Mineralogy page PDF

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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 Innsbruck-Land District Obernberg am Brenner ⓘ Obernberger Tribulaun	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 Genoa Ne ⓘ Molinello Mine	Marchesini, M., Pagano, R. (2001) The Val Graveglia manganese district, Liguria, Italy. The Mineralogical Record: 32: 349-379; 415.
Reppia Monte Copello ⓘ Valgraveglia Mine (Gambatesa Mine)	MinRec 32:365
La Spezia Province Borghetto di Vara ⓘ Cerchiara Mine	Balestra, C. (2006): Tutto (o quasi) il vanadio della Liguria a giugno 2006. Micro, 4, 55-82.
Maissana ⓘ Monte Alpe Mine	analysed by Dr. Anthony Kampf, Natural History Museum of Los Angeles County, USA
Piedmont Cuneo Province Canosio Vallone della Valletta ⓘ Valletta Mine	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
Tokyo Metropolis Nishitama district Okutama-cho ⓘ Shiromaru mine (Hakumaru mine)	Matsubara, S. et al (2004) Journal of Mineralogical and Petrological Sciences, 99, 363-367.

South Africa (TL)
Northern Cape Gloucester Farm ⓘ Gamagara Ridge (TL)	Amer.Min.(1943) 28, 329-335; The Manganese Adventure: The South African Manganese Fields
John Taolo Gaetsewe Gamagara Kathu Sishen ⓘ Unnamed borehole	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
Western Belt ⓘ Glosam Mine	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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Gamagarite

About GamagariteHide

Classification of GamagariteHide

Physical Properties of GamagariteHide

Optical Data of GamagariteHide

Chemical Properties of GamagariteHide

Crystallography of GamagariteHide

Crystal StructureHide

Type Occurrence of GamagariteHide

Other Language Names for GamagariteHide

Relationship of Gamagarite to other SpeciesHide

Common AssociatesHide

Related Minerals - Nickel-Strunz GroupingHide

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

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

Other InformationHide

References for GamagariteHide

Internet Links for GamagariteHide

Localities for GamagariteHide

Locality ListHide

Related Minerals - Nickel-Strunz Grouping Hide

Related Minerals - Hey's Chemical Index of Minerals Grouping Hide