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Nekoite

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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.

Crystal StructureHide

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IDSpeciesReferenceLinkYearLocalityPressure (GPa)Temp (K)
0000803NekoiteAlberti A, Galli E (1980) The structure of nekoite, Ca3Si6O15*7H2O, a new type of sheet silicate American Mineralogist 65 1270-12761980Caxias do Sul, Rio Grande do Sul, Brazil0293
CIF Raw Data - click here to close

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
HeulanditeNote on the distinguishing differences between heulandite and clinoptilolite (http://rruff.
Associated Minerals Based on Photo Data:
6 photos of Nekoite associated with JohannseniteCaMn2+Si2O6
4 photos of Nekoite associated with GalenaPbS
2 photos of Nekoite associated with Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)
1 photo of Nekoite associated with ZoisiteCa2Al3[Si2O7][SiO4]O(OH)

Related Minerals - Nickel-Strunz GroupingHide

9.EA.Bussyite-(Y)(Y,REE,Ca)3(Na,Ca)6MnSi9Be5(O,OH,F)34Mon. 2 : B2
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•6H2OOrth. mm2 : Pmm2
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. 2/m : P21/b
14.5.4RankiniteCa3Si2O7Mon. 2/m : P21/b
14.5.5KilchoaniteCa6(SiO4)(Si3O10)Orth.
14.5.6LarniteCa2SiO4Mon. 2/m
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. 1 : P1
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
 
  • Gobustan District
    • 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
    • Copiapó Province
      • Inca de Oro
Maurizio Dini & Robert Jenkins collections; material analysed by Dr. Uwe Kolitsch & Bob Jenkins
Hungary
 
  • Fejér County
No reference listed
    • Székesfehérvár District
      • 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
      • 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.
USA
 
  • Arizona
    • Graham Co.
      • Aravaipa Mining District
        • Santa Teresa Mountains
          • 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.
Uzbekistan
 
  • Tashkent
    • Okhangaron District
Handbook of Mineralogy - Anthony, Bideaux, Bladh, Nichols
 
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