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|System:||Monoclinic||Hardness:||4½ - 5|
|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:||126.96.36.199|
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
|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 Å³ (Calculated from Unit Cell)|
Optical Data of Gamagarite
|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|
Chemical Properties of Gamagarite
|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:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Gamagarite
|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
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
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.
(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.
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New Locality Added: Dosso dei Furli, Lavis, Trento Province, Trentino-Alto Adige, ItalyFrom Giorgio Bortolozzi, 7th Dec 2013 11:01:59