Help mindat.org|Log In|Register|
Home PageMindat NewsThe Mindat ManualHistory of MindatCopyright StatusManagement TeamContact UsAdvertise on Mindat
Donate to MindatSponsor a PageSponsored PagesTop Available PagesMindat AdvertisersAdvertise on MindatThe Mindat Store
Minerals by PropertiesMinerals by ChemistryRandom MineralSearch by minIDLocalities Near MeSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsMember ListBooks & MagazinesMineral Shows & EventsThe Mindat DirectoryHow to Link to MindatDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Mackinawite

This page is currently not sponsored. Click here to sponsor this page.
Formula:
(Fe,Ni)9S8
Also given as (Fe,Ni)1+xS (x = 0 to 0.11).
System:
Tetragonal
Colour:
Bronze, White Gray
Hardness:
Name:
Named after the discovery locality.
May be confused with valleriite.

Mackinawite may form as a metastable product of sulfidation of goethite in the CH4 atmosphere but only when CO2 is added, as shown by an experiment of Wang et al. (2015); it is followed by pyrrhotite.


Classification of Mackinawite

Approved
2.CC.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
C : With Ni, Fe, Co, PGE, etc.
Dana 7th ed.:
2.7.2.1
2.7.2.1

2 : SULFIDES
7 : AmBnXp, with (m+n):p = 9:8
3.9.6

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

Occurrences of Mackinawite

Type Occurrence of Mackinawite

Physical Properties of Mackinawite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Bronze, White Gray
Streak:
Black
Hardness (Mohs):
Cleavage:
Perfect
Perfect on the {001}
Density:
4.17 g/cm3 (Calculated)

Crystallography of Mackinawite

Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P4/nmm
Cell Parameters:
a = 3.67Å, c = 5.03Å
Ratio:
a:c = 1 : 1.371
Unit Cell Volume:
V 68 ų
Z:
2

Chemical Properties of Mackinawite

Formula:
(Fe,Ni)9S8

Also given as (Fe,Ni)1+xS (x = 0 to 0.11).
All elements listed in formula:
Common Impurities:
Co,Cu,Ni

Relationship of Mackinawite to other Species

2.CC.UM2007-26-S:CuFeIrNiPtRh(Ir,Cu,Ni,Pt,Rh,Fe)9S11
2.CC.05Achávalite(Fe,Cu)Se
2.CC.05BreithauptiteNiSb
2.CC.05FrebolditeCoSe
2.CC.05KotulskitePd(Te,Bi)
2.CC.05Langisite(Co,Ni)As
2.CC.05NickelineNiAs
2.CC.05Sederholmitebeta-NiSe
2.CC.05SobolevskitePd(Bi,Te)
2.CC.05StumpflitePt(Sb,Bi)
2.CC.05Sudburyite(Pd,Ni)Sb
2.CC.05JaipuriteCoS
2.CC.05ZlatogoriteNiCuSb2
2.CC.10PyrrhotiteFe7S8
2.CC.10Smythite(Fe,Ni)3+xS4 (x=0-0.3)
2.CC.10TroiliteFeS
2.CC.15CherepanoviteRhAs
2.CC.15Modderite(Co,Fe)As
2.CC.15Ruthenarsenite(Ru,Ni)As
2.CC.15Westerveldite(Fe,Ni,Co)As
2.CC.20MilleriteNiS
2.CC.20Mäkineniteγ-NiSe
2.CC.20UM1990-38-S:CuFeIrNiPtRh(Ir,Pt,Ni,Fe)S
2.CC.30Hexatestibiopanickelite(Pd,Ni)(Sb,Te)
2.CC.30VavříniteNi2SbTe2
2.CC.35aBraggite(Pt,Pd,Ni)S
2.CC.35bCooperitePtS
2.CC.35aVysotskite(Pd,Ni)S
3.9.1PyrrhotiteFe7S8
3.9.3PyriteFeS2
3.9.4MarcasiteFeS2
3.9.5GreigiteFe2+Fe23+S4
3.9.7Smythite(Fe,Ni)3+xS4 (x=0-0.3)
3.9.8Achávalite(Fe,Cu)Se
3.9.9FerroseliteFeSe2
3.9.10FrohbergiteFeTe2
3.9.11LöllingiteFeAs2
3.9.12ArsenopyriteFeAsS
3.9.13GudmunditeFeSbS

Other Names for Mackinawite

Name in Other Languages:

Other Information

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

References for Mackinawite

Reference List:
American Mineralogist (1963): 48: 215.

Kouvo, Olavi, Vuorelainen, Yrjo, and Long, J.V.P. (1963): A tetragonal iron sulfide. American Mineralogist 48, 511-524.

Evans H T, Milton C, Chao E C T, Adler I, Mead C, Ingram B, Berner R A (1964): Valleriite and the new iron sulfide, mackinawite. U.S. Geological Survey Professional Paper, 475-D, 64-69.

Chemie der Erde (1981): 40: 237.

Krupp, R. E. (1994): Phase relations and phase transformations between the low-temperature iron sulfides mackinawite, greigite, and smythite. European Journal of Mineralogy, 6, 265-278.

American Mineralogist (1995): 80: 188.

Lennie A R, Redfern S A T, Schofield P F, Vaughan D J (1995): Synthesis and Rietveld crystal structure refinement of mackinawite, tetragonal FeS. Mineralogical Magazine, 59, 677-683.

Wolthers, M., Van Der Gaast, S.J., and Rickard, D. (2003) The structure of disordered mackinawite. American Mineralogist 88, 2007-2015.

Wolthers, M., Charlet, L., Van Der Linde, P.R., Rickard, D., and Vamn Der Weijden, C.H. (2005) Surface chemistry of disordered mackinawite (FeS). Geochemica et Cosmochimica Acta: 69: 3469-3481.

Wang, M., Chou, I-M., Lu, W., De Vivo, B. (2015): Effects of CH4 and CO2 on the sulfidization of goethite and magnetite: an in situ Raman spectroscopic study in high-pressure capillary optical cells at room temperature. European Journal of Mineralogy: 27(2): 193-201

Internet Links for Mackinawite

mindat.org URL:
http://www.mindat.org/min-2512.html
Please feel free to link to this page.

Localities for Mackinawite

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.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2016, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: December 5, 2016 18:41:53 Page generated: December 3, 2016 13:31:23
Go to top of page