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Bravoite

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Maubacher Bleiberg, Untermaubach, Düren, Eifel, North Rhine-Westphalia, Germany
© R. Lang 2009

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Formula:
(Fe,Ni)S
 
2
System:IsometricColour:Steel gray
Lustre:MetallicHardness:6½
Name:Named after the Peruvian scientist, Jose J. Bravo (1874-1928).
A variety of Pyrite

A nickeloan variety of pyrite.
Compare the nickel analogue of pyrite, vaesite.

Originally reported from Ragra Mine (Minasragra), Junín, Cerro de Pasco, Alcides Carrión Province, Pasco Department, Peru.


Classification of Bravoite

IMA status:Discredited
Strunz 8th edition ID:2/0.0-00

2 : Sulphides
0 :
0 :
Hey's CIM Ref.:3.11.10

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
11 : Sulphides etc. of Ni
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Physical Properties of Bravoite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Steel gray
Streak:Black
Hardness (Mohs):6½
Hardness (Vickers):VHN100=889 - 927 kg/mm2
Tenacity:Brittle
Cleavage:Distinct/Good
{001}
Fracture:Irregular/Uneven, Conchoidal
Density (measured):4.62 - 4.72 g/cm3
Density (calculated):100 g/cm3

Crystallography of Bravoite

Crystal System:Isometric
Class (H-M):m3 (2/m 3) - Diploidal
Space Group:Pa3 {P21/a 3}
Space Group Setting:Pa3
Cell Parameters:a = 5.57Å
Unit Cell Volume:V 172.81 ų (Calculated from Unit Cell)
Z:4

Chemical Properties of Bravoite

Formula:
(Fe,Ni)S
 
2
Essential elements:Fe, S
All elements listed in formula:Fe, Ni, S

Relationship of Bravoite to other Species

Related Minerals - Strunz Grouping):

- +
2/0.0-Jeromite
2/0.0-Speculite
AuTe
 
2
2/0.0-Wurtzite Group
MX
2/0.0-Schlemaite
(Cu,◻)
 
6
(Pb,Bi)Se
 
4
2/0.0-Wilhelmramsayite
Cu
 
3
FeS
 
3
·2H
 
2
O
2/0.0-Britvinite
[Pb
 
7
(OH)
 
3
F(BO
 
3
)
 
2
(CO
 
3
)][Mg
 
4.5
(OH)
 
3
(Si
 
5
O
 
14
)]
Related Minerals - Hey's Index Grouping:

- +
3.11.1Heazlewoodite
Ni
 
3
S
 
2
3.11.2Godlevskite
(Ni,Fe)
 
9
S
 
8
3.11.3Millerite
NiS
3.11.4Polydymite
Ni
2+
 
Ni
3+
2
S
 
4
3.11.5Vaesite
NiS
 
2
3.11.6Shandite
Ni
 
3
Pb
 
2
S
 
2
3.11.7Donharrisite
Ni
 
8
Hg
 
3
S
 
9
3.11.8Violarite
Fe
2+
 
Ni
3+
2
S
 
4
3.11.9Pentlandite
(Fe,Ni)
 
9
S
 
8
3.11.11Siegenite
CoNi
 
2
S
 
4
 -NiCo
 
2
S
 
4
3.11.12Fletcherite
Cu(Ni,Co)
 
2
S
 
4
3.11.13Villamaninite
(Cu,Ni,Co,Fe)S
 
2
3.11.14Mäkinenite
γ-NiSe
3.11.15Sederholmite
beta-NiSe
3.11.16Trüstedtite
Ni
 
3
Se
 
4
3.11.17Wilkmanite
Ni
 
3
Se
 
4
3.11.18Kullerudite
NiSe
 
2
3.11.19Penroseite
(Ni,Co,Cu)Se
 
2
3.11.20Tyrrellite
Cu(Co
3+
 
,Ni
3+
 
)
 
2
Se
 
4
3.11.21Imgreite
NiTe (?)
3.11.22Melonite
NiTe
 
2
3.11.23Kitkaite
NiTeSe
3.11.24Dienerite
3.11.25Orcelite
Ni
 
5-x
As
 
2
3.11.26Maucherite
Ni
 
11
As
 
8
3.11.27Nickeline
NiAs
3.11.28Rammelsbergite
NiAs
 
2
3.11.29Pararammelsbergite
NiAs
 
2
3.11.30Nickelskutterudite
NiAs
 
2-3
3.11.31Oregonite
Ni
 
2
FeAs
 
2
3.11.32Westerveldite
(Fe,Ni,Co)As
3.11.33Langisite
(Co,Ni)As
3.11.34Gersdorffite
NiAsS
3.11.35Jolliffeite
NiAsSe
3.11.36Breithauptite
NiSb
3.11.38Ullmannite
NiSbS
3.11.39Willyamite
(Co,Ni)SbS

Other Names for Bravoite

Synonyms:
MechernichiteNickeloan Pyrite
Other Languages:
German:Bravoit
Mechernichit
Russian:Бравоит
Simplified Chinese:方硫铁镍矿
硫铁镍矿
Spanish:Bravoita
Mechernichita
Traditional Chinese:方硫鐵鎳礦
硫鐵鎳礦
Varieties:
Hengleinite

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 Bravoite

Reference List:

- +
Hillebrand (1907), American Journal mof Science: 24: 149.

Henglein (1914), Cbl. Min.: 129 (as kobaltnickelpyrit).

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 290-291.

Petruk, W., Harris, D.C., and Stewart, J.M. (1969) Langisite, a new mineral, and the rare minerals cobalt pentlandite, siegenite, parkerite, and bravoite from the Langis mine, Cobalt-Gowganda area, Ontario, Canada. Canadian Mineralogist: 9: 597-605.

Klemm, D. (1962): Untersuchungen über die Mischkristallbildung im Dreiecksdiagramm FeS2-CoS2-NiS2 und ihre Beziehungen im Aufbau der natürlichen "Bravoite", Neues Jahrbuch für Mineralogie, Monatshefte, 1962, 76-91.

Bayliss, P. (1989): Crystal chemistry and crystallography of some minerals within the pyrite group, American Mineralogist, 74, 1168-1176.

Internet Links for Bravoite

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    Locality Updated: Larson Exploration Prospect, Menominee Range, Florence Co., Wisconsin, USAFrom Bill Cordua, 19th Jun 2013 03:45:17