Mindat Logo
Home Page Log In Messageboard The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Braunite-II

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Wessels Mine (Wessel's Mine), Hotazel, Kalahari manganese fields, Northern Cape Province, South Africa
© vasco trancoso

Show Braunite-II Photos (4)



Formula:
CaMn
3+
14
(SiO
 
4
)O
 
20
System:TetragonalColour:black
Hardness:6
Name:For the close relation to braunite.


Braunite group.
Has a doubled cell parameter c by comparison to braunite.

Classification of Braunite-II

IMA status:Published without Approval
Nickel-Strunz 10th (pending) edition ID:9.AG.05

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

7 : MULTIPLE OXIDES
5 : (AB)2X3
mindat.org URL:http://www.mindat.org/min-4860.html
Please feel free to link to this page.

Type Occurrence of Braunite-II

Type Locality:Black Rock Mine, Black Rock, Kalahari manganese fields, Northern Cape Province, South Africa

Physical Properties of Braunite-II

Lustre:Sub-Metallic
Colour:black
Comment:yellow-brown in reflected light
Hardness (Mohs):6
Hardness Data:Measured

Crystallography of Braunite-II

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:I41/acd {I41/a 2/c 2/d}
Cell Parameters:a = 9.431Å, c = 37.774Å
Ratio:a:c = 1 : 4.005
Unit Cell Volume:V 3359.76 ų
Z:8
X-Ray Powder Diffraction:
d-spacingIntensity
3.68 (40)
2.72 (100)
2.35 (60)
1.996 (20)
1.666 (90)
1.423 (70)
1.081 (30)
1.052 (20)

Chemical Properties of Braunite-II

Formula:
CaMn
3+
14
(SiO
 
4
)O
 
20
Essential elements:Ca, Mn, O, Si
All elements listed in formula:Ca, Mn, O, Si

Relationship of Braunite-II to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
9.AG.05Abswurmbachite
CuMn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Braunite
Mn
2+
 
Mn
3+
6
(SiO
 
4
)O
 
8
9.AG.05Neltnerite
CaMn
3+
6
(SiO
 
4
)O
 
8
9.AG.10Långbanite
(Mn
2+
 
,Ca)
 
4
(Mn
3+
 
,Fe
3+
 
)
 
9
Sb
5+
 
(SiO
 
4
)
 
2
O
 
16
9.AG.15Malayaite
CaSn(SiO
 
4
)O
9.AG.15Titanite
CaTi(SiO
 
4
)O
9.AG.15Vanadomalayaite
CaV
4+
 
(SiO
 
4
)O
9.AG.15Natrotitanite
(Na
 
0.5
Y
 
0.5
)Ti(SiO
 
4
)O
9.AG.20Cerite-(Ce)
(Ce,Ca)
 
9
(Mg,Fe)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.20Cerite-(La)
(La,Ce,Ca)
 
9
(Fe,Ca,Mg)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.20Aluminocerite-(Ce)
(Ce,La,Ca)
 
9
(Al,Fe
3+
 
)(SiO
 
4
)
 
3
(HSiO
 
4
)
 
4
(OH)
 
3
9.AG.25Trimounsite-(Y)
Y
 
2
Ti
 
2
(SiO
 
4
)O
 
5
9.AG.25Yftisite-(Y)
(Y,Dy,Er)
 
4
(Ti,Sn)(SiO
 
4
)
 
2
O(F,OH)
 
6
9.AG.30Sitinakite
KNa
 
2
Ti
 
4
(SiO
 
4
)
 
2
O
 
5
(OH) · 4H
 
2
O
9.AG.35Kittatinnyite
Ca
 
2
Mn
 
2
Mn(SiO
 
4
)
 
2
(OH)
 
4
 · 9H
 
2
O
9.AG.40aNatisite
Na
 
2
Ti(SiO
 
4
)O
9.AG.40bParanatisite
Na
 
2
Ti(SiO
 
4
)O
9.AG.45Törnebohmite-(Ce)
(Ce,La)
 
2
Al(SiO
 
4
)
 
2
(OH)
9.AG.45Törnebohmite-(La)
(La,Ce)
 
2
Al(SiO
 
4
)
 
2
(OH)
9.AG.50Kuliokite-(Y)
Y
 
4
Al(SiO
 
4
)
 
2
(OH)
 
2
F
 
5
9.AG.55Chantalite
CaAl
 
2
(SiO
 
4
)(OH)
 
4
9.AG.60Mozartite
CaMn
3+
 
(SiO
 
4
)(OH)
9.AG.60Vuagnatite
CaAl(SiO
 
4
)(OH)
9.AG.65Hatrurite
Ca
 
3
(SiO
 
4
)O
9.AG.70Jasmundite
Ca
 
11
(SiO
 
4
)
 
4
O
 
2
S
9.AG.75Afwillite
Ca
 
3
(HSiO
 
4
)
 
2
 · 2H
 
2
O
9.AG.80Bultfonteinite
Ca
 
2
(HSiO
 
4
)F · H
 
2
O
9.AG.85Zoltaiite
BaV
4+
2
V
3+
12
(SiO
 
4
)
 
2
O
 
19
9.AG.90Tranquillityite
(Fe
2+
 
,Ca)
 
8
(Zr,Y)
 
2
Ti
 
3
(SiO
 
4
)
 
3
O
 
4

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 Braunite-II

Reference List:

- +
de Villiers, P.R. & F.H. Herbstein, Distinction between two members of the braunite group, American Mineralogist 52, 20(1967)

Moore, P.B. & T. Araki, Braunite: its structure and relationship to bixbyite, and some insights on the geanealogy of fluorite derivative structures, American Mineralogist 61, 1226-1240(1976)

de Villiers, J.P.R., The crystal structure of braunite II and its relation to bixbyite and braunite, American Mineralogist 65, 756(1980)

Baudracco-Gritti, C., Substitution du manganese bivalent par du calcium dans les mineraux du groupe: braunite, neltnerite, braunite II. Bulletin de Mineralogie 108,437(1985) [Amer. Min. 71,1543(1986); abstract and discussion]

de Villiers, J.P. & P.R.Buseck, Stacking variations and nonstoichiometry in the bixbyite-braunite polysomatic mineral group, American Mineralogist 74, 1325-1336(1989)

Bevan, D.J.M. & R.L.Martin, The role of the coordination defect: A new structural description of four fluorite-related sesquioxide minerals, bixbyite, braunite, braunite II, parwelite, and their structural relationships. Journal of Solid State Chemistry 181,2250-2259(2008)

Internet Links for Braunite-II

Search Engines:
  • Look for Braunite-II on Google
  • Look for Braunite-II images on Google
    • Mineral Dealers:
  • Top quality minerals from Kristalle of California
  • Search for Braunite-II on Well-Arranged Molecules
  • Wilensky Fine Minerals
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Buy from David K Joyce minerals
  • Search for - Braunite-II - on e-Rocks Mineral Sales & Auctions
  • High-end worldwide specimens & outstanding customer service
  • The Arkenstone - Fine Minerals
  • Fine and rare minerals from mintreasure.com
  • rare and unusual minerals mainly crystallized
  • webminerals
  • Find Braunite-II on www.crystalclassics.co.uk
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Braunite-II

    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.
    Hide Locality List
    (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.
    Morocco
     
    • Souss-Massa-Draâ Region
      • Ouarzazate Province
    		Georges FAVREAU collection
    South Africa
     
    • Northern Cape Province
      • Kalahari manganese fields
        • Black Rock
    		Am. Min. 52,20-30(1967)
        • Hotazel
    		Cairncross, B., Beukes, N. and Gutzmer, J. (1997): The manganese adventure – the South African manganese fields. Associated Ore & Metal Corporation Limited, Johannesburg, Republic of South Africa, 128 pp.
        • Kuruman
          • N'Chwaning Mines
    		Cairncross, B., Beukes, N. and Gutzmer, J. (1997): The manganese adventure – the South African manganese fields. Associated Ore & Metal Corporation Limited, Johannesburg, Republic of South Africa, 236 pp.
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 6th May 2013 15:17:15
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds