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Megawite

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Big Photo

Lakargi Mt., Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera), Kabardino-Balkarian Republic, Northern Caucasus Region, Russia
© Galuskin




Formula:
CaSnO
 
3
System:OrthorhombicColour:Pale yellowish brown, ...
Member of:Perovskite Group
Name:It is named in honour of the British crystallographer Helen Dick Megaw (1907-2002) who made significant contributions to our understanding of the structure and properties of natural and synthetic perovskites.
Isostructural with:Perovskite


Perovskite Group.

Classification of Megawite

IMA status:Approved 2010
Nickel-Strunz 10th (pending) edition ID:4.CC.30

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
C : With large and medium-sized cations
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Type Occurrence of Megawite

Type Locality:Lakargi Mt., Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera), Kabardino-Balkarian Republic, Northern Caucasus Region, Russia
General Appearance of Type Material:Either pseudo-cubic or pseudo-cuboctahedral crystals do not exceed 15 µm in size and usually occur as inclusions in spurrite (xenolith No. 1). Megawite forms rims on µm-sized lakargiite crystals in larnite-cuspidine zones in skarns which contain abundant
Place of Conservation of Type Material:Mineralogical Museum of Wrocław University, Poland under accession number MMUWrII16 717 and the Fersman Mineralogical Museum, Moscow, Russia under accession number4021/1.
Geological Setting of type material:It was found in the spurrite zone of skarned xenolith no. 1 (20-25 m in size) in ignimbrite.
Associated Minerals at type locality:
LarniteGrossular-Hibschite SeriesSpurriteHydroxylellestaditeRondorfite
WadaliteCalcitePericlaseLakargiite

Physical Properties of Megawite

Lustre:Vitreous
Diaphaneity (Transparency):Transparent
Colour:Pale yellowish brown, pale yellow to colourless
Streak:White
Cleavage:Distinct/Good
on {110} and {001}
Density (calculated):5.06 g/cm3

Crystallography of Megawite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:Pban {P2/b 2/a 2/n}
Cell Parameters:a = 5.56(3) Å, b = 5.71(3) Å, c = 7.943(3) Å
Ratio:a:b:c = 0.974 : 1 : 1.391
Unit Cell Volume:V 252.17 ų (Calculated from Unit Cell)
Z:4
X-Ray Powder Diffraction:
d-spacingIntensity
3.984 (52)
3.970 (19)
2.855 (43)
2.812 (100)
2.780 (19)
1.992 (13)
1.985 (13)
1.640 (13)

Optical Data of Megawite

Type:Biaxial
RI values: n = 1.89
Maximum Birefringence:δ = 0.000

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High

Chemical Properties of Megawite

Formula:
CaSnO
 
3
Essential elements:Ca, O, Sn
All elements listed in formula:Ca, O, Sn

Relationship of Megawite to other Species

Member of:Perovskite Group
Other Members of Group:

- +
Barioperovskite
BaTiO
 
3
Isolueshite
(Na,La,Ca)(Nb,Ti)O
 
3
Lakargiite
Ca(Zr,Sn,Ti)O
 
3
Loparite-(Ce)
(Na,Ce,Ca,Sr,Th)(Ti,Nb,Fe)O
 
3
Lueshite
NaNbO
 
3
Macedonite
PbTiO
 
3
Perovskite
CaTiO
 
3
Tausonite
SrTiO
 
3
Related Minerals - Nickel-Strunz Grouping):

- +
4.CC.05Chrombismite
Bi
 
16
CrO
 
27
4.CC.10Freudenbergite
Na
 
2
(Ti,Fe)
 
8
O
 
16
4.CC.15Grossite
CaAl
 
4
O
 
7
4.CC.20Mayenite
Ca
 
12
Al
 
14
O
 
33
4.CC.20Brearleyite
Ca
 
12
Al
 
14
O
 
32
Cl
 
2
4.CC.25Yafsoanite
Ca
 
3
Zn
 
3
(TeO
 
6
)
 
2
4.CC.30Latrappite
(Ca,Na)(Nb,Ti,Fe)O
 
3
4.CC.30Lueshite
NaNbO
 
3
4.CC.30Natroniobite
NaNbO
 
3
4.CC.30Perovskite
CaTiO
 
3
4.CC.30Barioperovskite
BaTiO
 
3
4.CC.30Lakargiite
Ca(Zr,Sn,Ti)O
 
3
4.CC.35Loparite-(Ce)
(Na,Ce,Ca,Sr,Th)(Ti,Nb,Fe)O
 
3
4.CC.35Macedonite
PbTiO
 
3
4.CC.35Tausonite
SrTiO
 
3
4.CC.35Isolueshite
(Na,La,Ca)(Nb,Ti)O
 
3
4.CC.40Crichtonite
(Sr,La,Ce,Y)(Ti,Fe
3+
 
,Mn)
 
21
O
 
38
4.CC.40Davidite-(Ce)
(Ce,La)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(La)
(La,Ce)(Y,U,Fe)(Ti,Fe)
 
20
(O,OH)
 
38
4.CC.40Davidite-(Y)
(Y,La,Ce,Na,Ca,Pb)(Y,Fe
2+
 
,◻)(Fe
2+
 
,Mn
2+
 
)
 
2
(Ti,Fe
3+
 
,Nb,Zr)
 
18
O
 
38
 (hypothetical)
4.CC.40Landauite
NaMnZn
 
2
(Ti,Fe)
 
6
Ti
 
12
O
 
38
4.CC.40Lindsleyite
(Ba,Sr)(Ti,Zr,Fe,Cr)
 
21
O
 
38
4.CC.40Loveringite
(Ca,Ce)(Ti,Fe,Cr,Mg)
 
21
O
 
38
4.CC.40Mathiasite
K(Ti,Cr,Fe,Mg,Zr)
 
21
O
 
38
4.CC.40Senaite
Pb(Ti,Fe,Mn)
 
21
O
 
38
4.CC.40Dessauite-(Y)
(Sr,Pb)(Y,U)(Ti,Fe
3+
 
)
 
20
O
 
38
4.CC.40Cleusonite
(Pb,Sr)(U
4+
 
,U
6+
 
)(Fe
2+
 
,Zn)
 
2
(Ti,Fe
2+
 
,Fe
3+
 
)
 
18
(O,OH)
 
38
4.CC.40Gramaccioliite-(Y)
(Pb,Sr)(Y,Mn)Fe
3+
2
(Ti,Fe
3+
 
)
 
18
O
 
38
4.CC.45Diaoyudaoite
NaAl
 
11
O
 
17
4.CC.45Hawthorneite
Ba(MgTi
 
3
Cr
 
4
Fe
 
4
)O
 
19
4.CC.45Hibonite
(Ca,Ce)Al
 
12
O
 
19
4.CC.45Lindqvistite
Pb
 
2
(Mg,Fe)Fe
 
16
O
 
27
4.CC.45Magnetoplumbite
(Pb,Mn)(Fe,Mn)
 
12
O
 
19
4.CC.45Plumboferrite
Pb
 
2
Fe
3+
11-x
Mn
2+
x
O
 
19-2x
, x = 1/3
4.CC.45Yimengite
K(Cr,Ti,Fe,Mg)
 
12
O
 
19
4.CC.45Haggertyite
Ba[Fe
2+
6
Ti
 
5
Mg]O
 
19
4.CC.45Nežilovite
PbZn
 
2
(Mn
4+
 
,Ti
4+
 
)
 
2
Fe
3+
8
O
 
19
4.CC.45Batiferrite
Ba[Ti
 
2
Fe
3+
8
Fe
2+
2
]O
 
19
4.CC.45IMA2009-027
(Fe,Mg)Al
 
12
O
 
19
4.CC.45Barioferrite
BaFe
3+
12
O
 
19
4.CC.50Jeppeite
(K,Ba)
 
2
(Ti,Fe)
 
6
O
 
13
4.CC.55Zenzénite
Pb
 
3
(Fe,Mn)
 
4
Mn
 
3
O
 
13
4.CC.60Mengxianminite
(Ca,Na)
 
3
(Fe,Mn)
 
2
Mg
 
2
(Sn,Zn)
 
5
Al
 
8
O
 
29

Other Names for Megawite

Synonyms:
IMA2009-090
Other Languages:

Other Information

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 Megawite

Reference List:

- +
Galuskin, E.V., Galuskina, I.O., Gazeev, V.M., Dzierżanowski, P., Prusik, K., Pertsev, N.N., Zadov, A.E. & Gurbanov, A.G. (2010): Megawite CaSnO3 - a new mineral of the perowskite group. 20th General Meeting of the IMA (IMA2010), Budapest, Hungary, August 21-27, CD of Abstracts, p. 444.

Galuskin, E.V., Galuskina, I.O., Gazeev, V.M., Dzierżanowski, P., Prusik, K., Pertsev, N.N., Zadov, A.E., Bailau, R. & Gurbanov, A.G. (2011): Megawite, CaSnO3: a new perovskite-group mineral from skarns of the Upper Chegem caldera, Kabardino-Balkaria, Northern Caucasus, Russia. Mineralogical Magazine, 75, 2563-2572.

Internet Links for Megawite

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    • Localities for Megawite

    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.
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    (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.
    Russia
     
    • Northern Caucasus Region
      • Kabardino-Balkarian Republic
        • Verkhnechegemskaya caldera (Verkhni Chegem caldera; Upper Chegem caldera)
    		IMA Approvals - Feb. 2010
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