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|Name:||For Sir Maurice Mawby (1904-1977).|
The monoclinic dimorph of Carminite.
May be confused with arsenbrackebuschite, also a Pb-Fe-arsenate.
Classification of Mawbyite
|IMA status:||Approved 1988|
|Strunz 8th edition ID:||7/C.31-60|
|Nickel-Strunz 10th (pending) edition ID:||8.CG.15|
8 : PHOSPHATES, ARSENATES, VANADATES
C : Phosphates without additional anions, with H2O
G : With large and medium-sized cations, RO4:H2O = 1:1
|Dana 8th edition ID:||220.127.116.11|
40 : HYDRATED NORMAL PHOSPHATES,ARSENATES AND VANADATES
2 : AB2(XO4)2·xH2O
|Hey's CIM Ref.:||20.5.16|
20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb
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Type Occurrence of Mawbyite
|Type Locality:||Kintore opencut, Broken Hill, Yancowinna Co., New South Wales, Australia|
|General Appearance of Type Material:||"dogtooth" crystals to .15 mm|
|Place of Conservation of Type Material:||South Australian Museum and Museum of Victoria|
|Year of Discovery:||1988|
|Geological Setting of type material:||Oxidized granular spessartine-quartz rock in a zone of several cubic meters.|
Physical Properties of Mawbyite
|Diaphaneity (Transparency):||Transparent, Translucent|
|Density (calculated):||5.53 g/cm3|
Crystallography of Mawbyite
|Cell Parameters:||a = 9.05Å, b = 6.27Å, c = 7.58Å|
β = 114.57°
|Ratio:||a:b:c = 1.443 : 1 : 1.209|
|Unit Cell Volume:||V 391.17 Å³ (Calculated from Unit Cell)|
|X-Ray Powder Diffraction:|
Optical Data of Mawbyite
|RI values:||nα = 1.940 nβ = 2.000 nγ = 2.040|
|2V:||Measured: 80° , Calculated: 76°|
|Maximum Birefringence:||δ = 0.100|
Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
|Surface Relief:||Very High|
Chemical Properties of Mawbyite
|Simplified for copy/paste:||Pb(Fe3+,Zn)2(AsO4)2·2(OH,H2O)|
|Essential elements:||As, Fe, H, O, Pb|
|All elements listed in formula:||As, Fe, H, O, Pb, Zn|
Relationship of Mawbyite to other Species
|Member of:||Tsumcorite Group|
|Other Members of Group:|
|Related Minerals - Nickel-Strunz Grouping):|
|Related Minerals - Hey's Index Grouping:|
Other Names for Mawbyite
|Fluorescence in UV light:||none|
|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 Mawbyite
Pring, A., McBriar, E. M. & Birch, W. D. (1989): Mawbyite, a new arsenate of lead and iron related to tsumcorite and carminite, from Broken Hill, New South Wales.: American Mineralogist: 74: 1377-1381.
Mineralogical Magazine: 61: 685-691.
European Journal of Mineralogy (1998): 10: 179-206.
Internet Links for Mawbyite
Localities for Mawbyite
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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Locality Updated: Mount Vernon meteorite, Christian Co., Kentucky, USAFrom Lon Clay Hill, 25th Oct 2014 03:02:01