IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
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 Educators
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
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Nekoite

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

About NekoiteHide

Formula:
Ca3Si6O15·7H2O
Colour:
White
Lustre:
Vitreous
Specific Gravity:
2.21 - 2.24
Crystal System:
Triclinic
Name:
An anagram (reverse spelling in this case) of OKENite, for which it was originally mistaken.
This page provides mineralogical data about Nekoite.


Classification of NekoiteHide

Approved, 'Grandfathered' (first described prior to 1959)
9.EA.45

9 : SILICATES (Germanates)
E : Phyllosilicates
A : Single nets of tetrahedra with 4-, 5-, (6-), and 8-membered rings
72.3.2.7

72 : PHYLLOSILICATES Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings
3 : Two-Dimensional Infinite Sheets with Other Than Six-Membered Rings with 3-, 4-, or 5-membered rings and 8-membered rings
14.5.25

14 : Silicates not Containing Aluminum
5 : Silicates of Ca

Physical Properties of NekoiteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
White
Hardness Data:
Could not be measured
Cleavage:
Distinct/Good
On {010}, distinct.
Density:
2.21 - 2.24 g/cm3 (Measured)    2.21 g/cm3 (Calculated)

Optical Data of NekoiteHide

Type:
Biaxial (+)
Dispersion:
r > v weak
Pleochroism:
Non-pleochroic

Chemical Properties of NekoiteHide

Formula:
Ca3Si6O15·7H2O
IMA Formula:
Ca3Si6O15 · 7H2O

Crystallography of NekoiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Cell Parameters:
a = 7.58 Å, b = 9.79 Å, c = 7.33 Å
α = 111.77°, β = 103.5°, γ = 86.53°
Ratio:
a:b:c = 0.774 : 1 : 0.749
Unit Cell V:
490.99 ų (Calculated from Unit Cell)
Morphology:
Crystals acicular to 5 mm long, elongated parallel to [001].

Comprised of tetrahedral sheets interlayered with octahedral chains.
Twinning:
Repeated with the lamellae parallel to the {010} cleavage.

Type Occurrence of NekoiteHide

General Appearance of Type Material:
Acicular white crystals.
Place of Conservation of Type Material:
U.S. National Museum of Natural History, Washington, D.C., USA
Geological Setting of Type Material:
Contact metamorphic limestone formation.
Associated Minerals at Type Locality:

Other Language Names for NekoiteHide

German:Nekoit
Russian:Некоит
Spanish:Nekoita

Common AssociatesHide

Apophyllite
Heulandite subgroupNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
Associated Minerals Based on Photo Data:
Johannsenite6 photos of Nekoite associated with Johannsenite on mindat.org.
Galena4 photos of Nekoite associated with Galena on mindat.org.
Axinite-(Mn)2 photos of Nekoite associated with Axinite-(Mn) on mindat.org.
Zoisite1 photo of Nekoite associated with Zoisite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.EA.05CuprorivaiteCaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05GillespiteBaFe2+Si4O10Tet.
9.EA.05EffenbergeriteBaCuSi4O10Tet. 4/mmm (4/m 2/m 2/m) : P4/ncc
9.EA.05WesselsiteSrCuSi4O10Tet.
9.EA.10EkaniteCa2ThSi8O20Tet. 4 2 2 : I4 2 2
9.EA.15Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2OTet. 4/mmm (4/m 2/m 2/m) : P4/mnc
9.EA.15Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2OTet.
9.EA.15Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2OOrth.
9.EA.20MagadiiteNa2Si14O29 · 11H2OMon.
9.EA.25DalyiteK2ZrSi6O15Tric.
9.EA.25DavaniteK2TiSi6O15Tric.
9.EA.30Sazhinite-(Ce)Na2CeSi6O14•6H2O
9.EA.30Sazhinite-(La)Na3La[Si6O15] · 2H2OOrth. mm2 : Pmm2
9.EA.35ArmstrongiteCaZr[Si6O15] · 3H2OMon.
9.EA.40OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
9.EA.50CavansiteCa(VO)Si4O10 · 4H2OOrth. mmm (2/m 2/m 2/m)
9.EA.55PentagoniteCa(VO)Si4O10 · 4H2OOrth. mm2
9.EA.60PenkvilksiteNa4Ti2Si8O22 · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbcn
9.EA.60TumchaiteNa2Zr(Si4O11) · 2H2OMon.
9.EA.65NabesiteNa2BeSi4O10 · 4H2OOrth. 2 2 2 : P21 21 21
9.EA.70Ajoite(K,Na)Cu7AlSi9O24(OH)6 · 3H2OTric.
9.EA.75ZeravshaniteNa2Cs4Zr3[Si18O45]*2H2OMon. 2/m : B2/b
9.EA.80Bussyite-(Ce)(Ce,REE)3(Na,H2O)6MnSi9Be5(O,OH)30F4Mon. 2/m : B2/b
9.EA.85PlumbophyllitePb2Si4O10 · H2OOrth. mmm (2/m 2/m 2/m) : Pbcn

Related Minerals - Dana Grouping (8th Ed.)Hide

72.3.2.1Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Orth.
72.3.2.2Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Mon.
72.3.2.3Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)Orth.
72.3.2.4RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
72.3.2.5OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
72.3.2.6TacharaniteCa12Al2Si18O33 (OH)36Mon.
72.3.2.8OyeliteCa10Si8B2O29 · 12.5H2OOrth.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

14.5.1WollastoniteCaSiO3Tric. 1 : P1
14.5.2Wollastonite-7TCaSiO3
14.5.3Wollastonite-2MCaSiO3Mon.
14.5.4RankiniteCa3Si2O7Mon. 2/m : P21/b
14.5.5KilchoaniteCa6(SiO4)(Si3O10)Orth.
14.5.6LarniteCa2SiO4Mon.
14.5.7BredigiteCa7Mg(SiO4)4Orth.
14.5.8HatruriteCa3(SiO4)OTrig.
14.5.9RosenhahniteHCa3[Si3O9(OH)]Tric.
14.5.10DellaiteCa6Si3O11(OH)2Tric.
14.5.11AfwilliteCa3(HSiO4)2 · 2H2OMon. m : Bb
14.5.12XonotliteCa6(Si6O17)(OH)2Mon. 2/m
14.5.13FoshagiteCa4(Si3O9)(OH)2Tric.
14.5.14HillebranditeCa2(SiO3)(OH)2Orth. mmm (2/m 2/m 2/m) : Cmcm
14.5.15JaffeiteCa6(Si2O7)(OH)6Trig. 3 : P3
14.5.16SuoluniteCa2(H2Si2O7) · H2OOrth.
14.5.17KillalaiteCa6.4(H0.6Si2O7)2(OH)2Mon.
14.5.18OkeniteCa10Si18O46 · 18H2OTric. 1 : P1
14.5.19RiversideiteCa5(HSi3O9)2 · 2H2OOrth.
14.5.20TrabzoniteCa4(Si3O9)(OH)2Orth. mm2 : Ama2
14.5.21GyroliteNaCa16Si23AlO60(OH)8 · 14H2OTric.
14.5.22FoshallasiteCa3[Si2O7] · 3H2O(?)
14.5.23Tobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Orth.
14.5.24Clinotobermorite[Ca4Si6O17 · 2H2O]·(Ca·3H2O)Mon.
14.5.26Plombièrite[Ca4Si6O16(OH)2 · 2H2O]·(Ca·5H2O)Orth.
14.5.27JenniteCa9(Si3O9)2(OH)8 · 8H2OTric.

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 NekoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
American Mineralogist (1955): 40: 933.
Gard, John Alan & H.F.W. Taylor (1956), Okenite and nekoite: Mineralogical Magazine: 31: 5-20.
Mamedov, K.S. and Belov, N.V. (1958) Crystal structure of mica-like hydrous calcium silicates: okenite, nekoite, truscottite, and gyrolite New silicate radical [Si6O15]. Doklady Akademii Nauk SSSR: 121: 713-716.
Chalmers, R.A., A.W. Nichol & H.F.W. Taylor (1962), The composition of nekoite: Mineralogical Magazine: 33: 70-71.
Nicol, A. (1971) Nekoite. 1. Composition and thermal dehydration. Acta Crystallographica: B127: 469-476.
Vezzalini, G. (1979) Secondo ritrovamento della nekoite. Periodico di Mineralogia: 48: 5-13.
Alberti, A. and E. Galli (1980) The structure of nekoite, Ca3Si6O15·7H2O; a new type of sheet silicate. American Mineralogist: 65: 1270-1276.

Internet Links for NekoiteHide

Localities for NekoiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - 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.
Azerbaijan
 
  • Qobustan District (Gobustan; Kobustan)
    • Caspian Sea
Novgorodova M.I., Mamedov Yu.G.. Native aluminium from mud volcano at the Bulla island (caspian Sea), - Lithology and Mineral Resourses,1996,N4,p. 339-349
Brazil
 
  • Rio Grande do Sul
Vezzalini, G. (1979) Secondo ritrovamento della nekoite. Periodico di Mineralogia: 48: 5-13.
Chile
 
  • Atacama Region
    • Copiapó Province
      • Inca de Oro
Maurizio Dini & Robert Jenkins collections; material analysed by Dr. Uwe Kolitsch & Bob Jenkins
Hungary
 
  • Fejér Co.
No reference listed
      • Kőszárhegy
Fehér, B. & Sajó, I. E. (2000): Okenite and nekoite from the Szár Hill, Polgárdi, Hungary. Acta Mineralogica-Petrographica (Szeged), XLI, Suppl., 40.
Italy
 
  • Veneto
    • Padova Province
      • Euganean Hills (Euganei Hills)
        • Cinto Euganeo
          • Faedo
            • Monte Fasolo
Passaglia, E. , Tagliavini, A. (1995) Erionite from Faedo, Colli Euganei, Italy. Neues Jahrbuch für Mineralogie, Monatshefte, 185-191; Fabris, L., Guastoni, A. (2014) Provincia di Padova. In: Zorzi, F., Boscardin, M., (eds.), Minerali del Veneto. Alla scoperta dei tesori della nostra regione. Museo di Storia Naturale e Archeologia di Montebelluna - Treviso, Cierre Edizioni, Sommacampagna, pages 121-141; Zorzi, F. (2014) Percorso nel Padovano. Monte Fasolo, Monte Rusta, Monte Gemola. In: Zorzi, F., Boscardin, M., (eds.), Minerali del Veneto. Alla scoperta dei tesori della nostra regione. Museo di Storia Naturale e Archeologia di Montebelluna - Treviso, Cierre Edizioni, Sommacampagna, pages 293-299.
Tajikistan
 
  • Viloyati Sogd (Viloyati Sughd; Viloyati Khodzhent; Viloyati Leninabad)
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
USA
 
  • Arizona
    • Graham Co.
      • Aravaipa District
        • Santa Teresa Mts
          • Aravaipa
            • Landsman Camp (Landsman group)
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 311.
  • California
    • Riverside Co.
      • Crestmore
        • Crestmore quarries
          • Sky Blue Hill
Gard, John Alan & H.F.W. Taylor (1956), Okenite and nekoite: Mineralogical Magazine: 31: 5-20; Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 477.
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: October 21, 2018 03:08:57 Page generated: September 13, 2018 20:22:07
Go to top of page