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Sphaerobismoite

Formula:
Bi
 
2
O
 
3
System:TetragonalLustre:Sub-Adamantine
Hardness:4
Name:For the form of the aggregates and the composition.


The natural analogue of beta-Bi2O3. A polymorph of bismite.

Classification of Sphaerobismoite

IMA status:Approved 1993
Strunz 8th edition ID:4/C.02-35
Nickel-Strunz 10th (pending) edition ID:4.CB.65

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations
Dana 8th edition ID:4.3.13.1

4 : SIMPLE OXIDES
3 : A2X3
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Type Occurrence of Sphaerobismoite

Co-type Localities:Neubulach, Calw, Black Forest, Baden-Württemberg, Germany
Wittichen, Schenkenzell, Black Forest, Baden-Württemberg, Germany

Physical Properties of Sphaerobismoite

Lustre:Sub-Adamantine
Hardness (Mohs):4

Crystallography of Sphaerobismoite

Crystal System:Tetragonal
Cell Parameters:a = 8.02Å, c = 6.46Å
Ratio:a:c = 1 : 0.805
Unit Cell Volume:V 415.51 ų (Calculated from Unit Cell)
Z:4

Optical Data of Sphaerobismoite

Type:Uniaxial (+)
RI values: nω = 2.130 nε = 2.180
Maximum Birefringence:δ = 0.050

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

Chemical Properties of Sphaerobismoite

Formula:
Bi
 
2
O
 
3
Essential elements:Bi, O
All elements listed in formula:Bi, O

Relationship of Sphaerobismoite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.CB.05Brizziite
NaSb
5+
 
O
 
3
4.CB.05Corundum
Al
 
2
O
 
3
4.CB.05Ecandrewsite
(Zn,Fe
2+
 
,Mn
2+
 
)TiO
 
3
4.CB.05Eskolaite
Cr
 
2
O
 
3
4.CB.05Geikielite
MgTiO
 
3
4.CB.05Hematite
Fe
 
2
O
 
3
4.CB.05Ilmenite
Fe
2+
 
TiO
 
3
4.CB.05Karelianite
V
 
2
O
 
3
4.CB.05Melanostibite
Mn
2+
 
(Sb
5+
 
,Fe
3+
 
)O
 
3
4.CB.05Pyrophanite
Mn
2+
 
TiO
 
3
4.CB.05Auroantimonate
AuSbO
 
3
4.CB.05Romanite
([],Pb,Ca)UFe
2+
2
(Ti,Fe
3+
 
)
 
6
Ti
 
12
O
 
38
4.CB.10Avicennite
Tl
 
2
O
 
3
4.CB.10Bixbyite
(Mn
3+
 
,Fe
3+
 
)
 
2
O
 
3
4.CB.15Armalcolite
(Mg,Fe
2+
 
)Ti
 
2
O
 
5
4.CB.15Pseudobrookite
Fe
 
2
TiO
 
5
4.CB.15Mongshanite
(Mg,Cr,Fe
2+
 
)
 
2
(Ti,Zr)
 
5
O
 
12
4.CB.20Zincohögbomite-2N2S
Ti(Zn,Mg,Fe)
 
2
Al
 
8
O
 
15
(OH)
4.CB.20Zincohögbomite-2N6S
Ti(Zn,Mg,Fe)
 
6
Al
 
16
O
 
31
(OH)
4.CB.20Magnesiohögbomite-6N6S
Ti(Mg,Fe)
 
2
Al
 
8
O
 
15
(OH)
4.CB.20Magnesiohögbomite-2N3S
Ti(Mg,Fe)
 
3
Al
 
10
O
 
19
(OH)
4.CB.20Magnesiohögbomite-2N2S
Ti(Mg,Fe)
 
2
Al
 
8
O
 
15
(OH)
4.CB.20Ferrohögbomite-6N12S
Ti(Fe,Mg)
 
4
Al
 
12
O
 
23
(OH)
4.CB.25Pseudorutile
Fe
 
2
Ti
 
3
O
 
9
4.CB.30Berdesinskiite
V
3+
2
TiO
 
5
4.CB.35Olkhonskite
(Cr,V)
 
2
Ti
 
3
O
 
9
4.CB.35Schreyerite
V
 
2
Ti
 
3
O
 
9
4.CB.40Kamiokite
Fe
 
2
Mo
 
3
O
 
8
4.CB.40Nolanite
(V,Fe,Fe,Ti)
 
10
O
 
14
(OH)
 
2
4.CB.40Rinmanite
Zn
 
2
Sb
 
2
Mg
 
2
Fe
 
4
O
 
14
(OH)
 
2
4.CB.45Claudetite
As
 
2
O
 
3
4.CB.45Stibioclaudetite
AsSbO
 
3
4.CB.50Arsenolite
As
 
2
O
 
3
4.CB.50Sénarmontite
Sb
 
2
O
 
3
4.CB.55Valentinite
Sb
 
2
O
 
3
4.CB.60Bismite
Bi
 
2
O
 
3
4.CB.70Sillénite
Bi
 
12
SiO
 
20
4.CB.75Kyzylkumite
V
 
2
Ti
 
3
O
 
9
4.CB.80Tietaiyangite
Fe
3+
4
Fe
2+
 
TiO
 
9

Other Names for Sphaerobismoite

Synonyms:
IMA1993-009
Other Languages:
German:Sphaerobismoit
Russian:Сферобисмоит
Spanish:Sphaerobismoita

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 Sphaerobismoite

Reference List:Walenta, K. (1995): Sphaerobismoite , a new mineral of composition Bi2O3 from the Schwarzwald. Aufschluss: 46: 245-248. (in German).

Mineralogical Record: 28: 223-224.

Articles/Blogs about Sphaerobismoite

Internet Links for Sphaerobismoite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Search for Sphaerobismoite in the Natural History Museum (London) online catalogue
  • Sphaerobismoite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
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  • rare and unusual minerals mainly crystallized
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    Localities for Sphaerobismoite

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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.
    Germany
     
    • Baden-Württemberg
      • Black Forest
        • Calw
    		Min Rec, 28, (3) & Am. Min. (1996) 81, 514
        • Schenkenzell
    Hungary
     
    • Pest Co.
      • Börzsöny Mts.
        • Nagybörzsöny
    		GEODA 2005/3
    Mineral and/or Locality
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