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Braunite-II

Valid as an unnamed mineral
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00896810017271927876728.jpg
Braunite-II, etc.

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
01616690017271927895700.jpg
Braunite-II

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
09825090017271927906880.jpg
Braunite-II, etc.

N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
00896810017271927876728.jpg
Braunite-II, etc.

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
01616690017271927895700.jpg
Braunite-II

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
09825090017271927906880.jpg
Braunite-II, etc.

N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
00896810017271927876728.jpg
Braunite-II, etc.

Wessels Mine, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
03813630017271927913015.jpg
Braunite-II

N'Chwaning II Mine, N'Chwaning Mines, Joe Morolong Local Municipality, John Taolo Gaetsewe District Municipality, Northern Cape, South Africa
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About Braunite-IIHide

Formula:
Ca(Mn3+,Fe)14(SiO4)O20
Mn:Fe ratio is approx. 5:1.
Colour:
black
Lustre:
Sub-Metallic
Hardness:
6
Crystal System:
Tetragonal
Member of:
Braunite Group
Name:
For the close relation to braunite.
Has a doubled unit-cell parameter c by comparison to braunite.

"The structure of braunite II, (...), is simply an intergrowth of slabs of bixbyite- and braunite-type structures, linked by the CaO8 cubes of the latter." (Bevan and Martin, 2008).


Unique IdentifiersHide

Mindat ID:
4860
Long-form identifier:
mindat:1:1:4860:2

Similar NamesHide

BerauniteA valid IMA mineral species - grandfatheredFe63+(PO4)4O(OH)4 · 6H2O
BrauniteA valid IMA mineral species - grandfatheredMn2+Mn63+(SiO4)O8

IMA Classification of Braunite-IIHide

IMA status notes:
Unnamed (probably valid)
Approval history:
Unnamed, but probably valid.

Classification of Braunite-IIHide

Strunz-mindat (2026):
9.AG.05

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
Dana 8th ed.:
7.5.1.3

7 : MULTIPLE OXIDES
5 : (AB)2X3

Physical Properties of Braunite-IIHide

Lustre:
Sub-Metallic
Colour:
Black
Comment:
yellow-brown in reflected light
Hardness:
6 on Mohs scale
Hardness Data:
Measured

Chemistry of Braunite-IIHide

Mindat Formula:
Ca(Mn3+,Fe)14(SiO4)O20

Mn:Fe ratio is approx. 5:1.
Element Weights:
Element% weight
Mn62.978 %
O31.441 %
Ca3.282 %
Si2.300 %

Calculated from ideal end-member formula.
Elements listed:
Ca, Fe, Mn, O, Si - search for minerals with similar chemistry

Crystallography of Braunite-IIHide

Crystal System:
Tetragonal
Class (H-M):
4/mmm(4/m2/m2/m) - Ditetragonal Dipyramidal
Space Group:
I41/acd
Cell Parameters:
a = 9.431 Å, c = 37.774 Å
Ratio:
a:c = 1 : 4.005
Unit Cell V:
3359.76 ų
Z:
8

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.68 Å(40)
2.72 Å(100)
2.35 Å(60)
1.996 Å(20)
1.666 Å(90)
1.423 Å(70)
1.081 Å(30)
1.052 Å(20)

First Recorded Occurrence of Braunite-IIHide

Synonyms of Braunite-IIHide

Other Language Names for Braunite-IIHide

German:Braunit-II

Relationship of Braunite-II to other SpeciesHide

Member of:
Braunite Group
Other Members of Braunite Group:
AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
GatedaliteZrMn2+2Mn3+4SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd
NeltneriteCaMn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
SkogbyiteZr(Mg2Mn3+4)SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd

Common AssociatesHide

Associations Based on Photo Data:
16 photos of Braunite-II associated with AndraditeCa3Fe3+2(SiO4)3
9 photos of Braunite-II associated with HausmanniteMn2+Mn3+2O4
3 photos of Braunite-II associated with CalciteCaCO3
2 photos of Braunite-II associated with PectoliteNaCa2Si3O8(OH)
2 photos of Braunite-II associated with NamansiliteNaMn3+Si2O6
2 photos of Braunite-II associated with HematiteFe2O3
2 photos of Braunite-II associated with DespujolsiteCa3Mn4+(SO4)2(OH)6 · 3H2O
2 photos of Braunite-II associated with ClinochloreMg5Al(AlSi3O10)(OH)8
2 photos of Braunite-II associated with BaryteBaSO4
2 photos of Braunite-II associated with Taniajacoite SrCaMn3+2Si4O11(OH)4 · 2H2O

Related Minerals - Strunz-mindat GroupingHide

9.AG.Aluminotaipingite-(CeCa)(Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3Trig. 3m : R3c
9.AG.'Ivanyukite-Na-T'Na2Ti4(SiO4)3(OH)O3 · 7H2OTrig. 3m : R3m
9.AG.'Ivanyukite-Na-C'Na2Ti4(SiO4)3(OH)2O2 · 6H2OIso. 43m : P43m
9.AG.EdgrewiteCa9(SiO4)4F2 Mon. 2/m : P21/b
9.AG.02GatedaliteZrMn2+2Mn3+4SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05NeltneriteCaMn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05SkogbyiteZr(Mg2Mn3+4)SiO12Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.05BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm(4/m2/m2/m) : I41/acd
9.AG.10LångbaniteMn2+4Mn3+9Sb5+O16(SiO4)2Trig. 3m : P3m1
9.AG.12Taipingite-(CeCa)(Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3Trig. 3m : R3c
9.AG.15ŻabińskiiteCa[Al0.5(Ta,Nb)0.5)]O(SiO4)Tric. 1
9.AG.15TitaniteCaTiO(SiO4)Mon. 2/m : P21/b
9.AG.15VanadomalayaiteCaVO(SiO4)Mon. 2/m : B2/b
9.AG.15Natrotitanite(Na0.5Y0.5)TiO(SiO4)Mon. 2/m : B2/b
9.AG.15MalayaiteCaSnO(SiO4)Mon. 2/m
9.AG.20Ferricerite-(LaCa)(La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3Trig. 3m : R3c
9.AG.20Aluminocerite-(CeCa)(Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3Trig. 3m : R3c
9.AG.20Cerite-(CeCa)(Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3Trig. 3m : R3c
9.AG.20Nipeiite-(Ce)Ce9Fe3+(SiO4)6[SiO3(OH)](OH)3Trig. 3m : R3c
9.AG.25'Yftisite-(Y)'(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
9.AG.25Mieite-(Y)Y4Ti(SiO4)2O[F,(OH)]6Orth. mmm(2/m2/m2/m) : Cmcm
9.AG.25Trimounsite-(Y)Y2Ti2(SiO4)O5Mon. 2/m : P21/b
9.AG.30SitinakiteKNa2Ti4(SiO4)2O5(OH) · 4H2OTet. 4/mmm(4/m2/m2/m) : P42/mcm
9.AG.35KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
9.AG.40bParanatisiteNa2Ti(SiO4)OOrth. mmm(2/m2/m2/m) : Pmma
9.AG.40aNatisiteNa2Ti(SiO4)OTet. 4/mmm(4/m2/m2/m)
9.AG.45Törnebohmite-(Ce)Ce2Al(SiO4)2(OH)Mon. 2/m : P21/b
9.AG.45Törnebohmite-(La)La2Al(SiO4)2(OH)
9.AG.50Ivanyukite-NaNa2Ti4(SiO4)3(OH)2O2 · 6H2OTrig. 3m : R3m
9.AG.50Ivanyukite-KK2Ti4(SiO4)3(OH)2O2 · 9H2OIso. 43m : P43m
9.AG.50Ivanyukite-CuCuTi4(SiO4)3(OH)2O2 · 7H2OIso. 43m : P43m
9.AG.50Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5Mon. m
9.AG.50HydroxyledgrewiteCa9(SiO4)4(OH)2 Mon. 2/m : P21/b
9.AG.52Ulfanderssonite-(Ce)(Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3Mon. m : Bm
9.AG.55ChantaliteCaAl2(SiO4)(OH)4Tet. 4/m : I41/a
9.AG.60VuagnatiteCaAl(SiO4)(OH)Orth. 222 : P212121
9.AG.60MozartiteCaMn3+(SiO4)(OH)Orth. 222 : P212121
9.AG.65HatruriteCa3(SiO4)OTrig.
9.AG.70JasmunditeCa11(SiO4)4O2STet. 42m : I4m2
9.AG.75AfwilliteCa3[SiO4][SiO2(OH)2] · 2H2OMon. m : Bb
9.AG.80BultfonteiniteCa2(HSiO4)F · H2OTric. 1 : P1
9.AG.85ZoltaiiteBaV4+2V3+12(SiO4)2O19Trig. 3 : P3
9.AG.90Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12Hex.

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for Braunite-IIHide

References for Braunite-IIHide

Localities for Braunite-IIHide

Showing 4 localities.

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.
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Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Morocco
 
  • Drâa-Tafilalet Region
    • Zagora Province
      • Agdz Cercle
        • Tansifte Caïdat
FAVREAU G. & DIETRICH J.E. (2006)
South Africa (FRL)
 
  • Northern Cape
    • John Taolo Gaetsewe District Municipality
      • Joe Morolong Local Municipality
        • Black Rock
de Villiers et al. (1967) +3 other references
        • N'Chwaning Mines
De Villiers (1945b) +6 other references
Beukes et al. (1995) +1 other reference
Quick NavTopAbout Braunite-IIUnique IdentifiersSimilar NamesIMA Classification Classification Physical Properties Chemistry Crystallography X-Ray Powder DiffractionFirst Recorded Occurrence SynonymsOther LanguagesRelationshipsCommon AssociatesStrunz-MindatOther InformationInternet Links References Localities Locality List
 
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