ALMOST THERE!. Help us with a final push needed to keep mindat.org running. Click here to help.
Catawiki are hosting a mindat.org benefit auction. All proceeds to mindat.org! BID NOW
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for EducatorsMindat Articles
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
Mining CompaniesStatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Omsite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About OmsiteHide

Formula:
Ni2Fe3+(OH)6[Sb(OH)6]
Colour:
bright yellow to amber yellow
Lustre:
Vitreous, Resinous
Hardness:
3
Specific Gravity:
3.378 (Calculated)
Crystal System:
Trigonal
Name:
Named for the closest town, Oms, Pyrénées-Orientales Department, France.
Omsite is a layered double hydroxide (LDH) mineral, with a topology consistent with members of the hydrotalcite supergroup and cualstibite group.


Classification of OmsiteHide

Approved
Approval Year:
2012
4.FB.

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
F : Hydroxides (without V or U)
B : Hydroxides with OH, without H2O; insular octahedra

Physical Properties of OmsiteHide

Vitreous, Resinous
Transparency:
Transparent, Translucent
Colour:
bright yellow to amber yellow
Streak:
yellow
Hardness:
Hardness Data:
Estimated
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
001
Fracture:
Irregular/Uneven
Density:
3.378 g/cm3 (Calculated)

Optical Data of OmsiteHide

Type:
Uniaxial (-)
RI values:
nω = 1.728() nε = 1.660(1)
Max Birefringence:
δ = 0.068
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High

Chemical Properties of OmsiteHide

Formula:
Ni2Fe3+(OH)6[Sb(OH)6]

Crystallography of OmsiteHide

Crystal System:
Trigonal
Class (H-M):
3 - Pyramidal
Space Group:
P3
Setting:
P3
Cell Parameters:
a = 5.3506(8) Å, c = 19.5802(15) Å
Ratio:
a:c = 1 : 3.659
Unit Cell V:
485.46 ų
Z:
2
Morphology:
Discoidal tablets, flattened on {001}, which form rosettes typically 50–100 μm in diameter.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.901 (100)
4.575 (83)
2.3539 (81)
1.8079 (48)
3.781 (34)

Type Occurrence of OmsiteHide

General Appearance of Type Material:
Bright yellow to amber yellow discoidal tablets. Generally crystallizes on siderite.
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County, catalogue numbers 63428 and 63429, and Museum Victoria, registration number M51584.
Associated Minerals at Type Locality:

Synonyms of OmsiteHide

Relationship of Omsite to other SpeciesHide

Other Members of this group:
CualstibiteCu2Al(OH)6[Sb5+(OH)6]Trig. 3 : P3
ZincalstibiteZn2Al(OH)6[Sb5+(OH)6]Trig. 3 : P3

Common AssociatesHide

Associated Minerals Based on Photo Data:
Glaukosphaerite1 photo of Omsite associated with Glaukosphaerite on mindat.org.
Siderite1 photo of Omsite associated with Siderite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

4.FB.05Shakhovite(Hg+2)Hg2+2(Sb3+O3)(OH)3Mon.
4.FB.10CualstibiteCu2Al(OH)6[Sb5+(OH)6]Trig. 3 : P3
4.FB.10ZincalstibiteZn2Al(OH)6[Sb5+(OH)6]Trig. 3 : P3

Fluorescence of OmsiteHide

Not fluorescent in either short-wave or long-wave ultraviolet light.

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.

References for OmsiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Berbain, C. & Favreau, G. (2007): Un exemple peu courant de minéralisation nickélifère: le Correc d'en Llinassos à Oms (Pyrénées-Orientales). Le Cahier des Micromonteurs, 95(1), 3-24.
Mills, S.J., Kampf, A.R., Housley, R.M., Favreau, G., Pasero, M., Biagioni, C., Merlino, S., Berbain, C., Orlandi, P. (2012): Omsite, (Ni,Cu)2Fe3+(OH)6[Sb(OH)6], a new member of the cualstibite group from Oms, France. Mineralogical Magazine, 76, 1347-1354.
Mills, S.J., Christy, A.G., Genin, J.-M.R., Kameda, T., Colombo, F. (2012): Nomenclature of the hydrotalcite supergroup: natural layered double hydroxides. Mineralogical Magazine, 76, 1289-1336.

Internet Links for OmsiteHide

Localities for OmsiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
France (TL)
 
  • Occitanie
    • Pyrénées-Orientales
      • Oms
Mills, S.J., Kampf, A.R., Housley, R.M., Favreau, G., Pasero, M., Biagioni, C., Merlino, S., Berbain, C., Orlandi, P. (2012): Omsite, (Ni,Cu)2Fe3+(OH)6[Sb(OH)6], a new member of the cualstibite group from Oms, France. Mineralogical Magazine, 76, 1347-1354.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium; Lavreotiki Municipality)
      • Lavrion District Mines
        • Lavrion (Laurion; Laurium)
Rieck, B., Kolitsch, U., Voudouris, P., Giester, G. and Tzeferis, P. (2018): Weitere Neufunde aus Lavrion, Griechenland. Mineralien-Welt 29 (5), 32-77 (in German).
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 1993-2018, 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 12, 2018 16:24:52 Page generated: November 2, 2018 16:00:50
Go to top of page