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Natrotitanite

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Formula:
(Na0.5Y0.5)Ti(SiO4)O
Minor REE may replace Y.
Colour:
Milky white to yellowish grey
Lustre:
Vitreous
Specific Gravity:
3.833 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
For the Na content and the close relation to titanite.
Not to be confused with natrotantite. Compare 'UM1980-15-SiO:REETi'.


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Classification of NatrotitaniteHide

Approved
Approval Year:
2011
9.AG.15

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination

Pronounciation of NatrotitaniteHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of NatrotitaniteHide

Vitreous
Transparency:
Transparent, Translucent
Colour:
Milky white to yellowish grey
Streak:
White
Tenacity:
Brittle
Cleavage:
None Observed
Density:
3.833 g/cm3 (Calculated)

Optical Data of NatrotitaniteHide

Type:
Biaxial
RI values:
nα = 1.904(2) nγ = 2.030(2)
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Max Birefringence:
δ = 0.126
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of NatrotitaniteHide

Formula:
(Na0.5Y0.5)Ti(SiO4)O

Minor REE may replace Y.
IMA Formula:
(Na0.5Y0.5)TiO(SiO4)

Crystallography of NatrotitaniteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 6.5691(2) Å, b = 8.6869(3) Å, c = 7.0924(2) Å
β = 114.1269(4)°
Ratio:
a:b:c = 0.756 : 1 : 0.816
Unit Cell V:
369.4 ų
Z:
4

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.941 (30)
3.248 (80)
2.994 (60)
2.597 (100)
2.273 (30)
2.067 (20)
1.641 (40)
1.498 (30)

Type Occurrence of NatrotitaniteHide

General Appearance of Type Material:
Star-shaped aggregates of small short prisms of yellow or yellowish white (Na,Y,REE)-bearing titanite rimmed by thin (~2 µm) rims of natrotitanite are embedded in yttrium-bearing fluorite and replace narsarsukite.
Place of Conservation of Type Material:
Geological Scientific Museum of the Satpaev Institute of Geological Sciences, Almaty, Kazakhstan: registration number 3010.
Geological Setting of Type Material:
In a rare-element deposit, which is spatially related to two small oval outcrops of alkaline granite.
Associated Minerals at Type Locality:

Synonyms of NatrotitaniteHide

Relationship of Natrotitanite to other SpeciesHide

Member of:
Other Members of this group:
MalayaiteCaSn(SiO4)OMon.
TitaniteCaTi(SiO4)OMon. 2/m : P21/b
VanadomalayaiteCaV4+(SiO4)OMon.
ŻabińskiiteCa[Al0.5(Ta,Nb)0.5)](SiO4)OTric. 1

Related Minerals - Nickel-Strunz GroupingHide

9.AG.EdgrewiteCa9(SiO4)4F2 Mon. 2/m : P21/b
9.AG.05AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05NeltneriteCaMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05Braunite-IICaMn3+14(SiO4)O20Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.10LångbaniteMn2+4Mn3+9Sb5+O16(SiO4)2Trig. 3m : P3m1
9.AG.15MalayaiteCaSn(SiO4)OMon.
9.AG.15TitaniteCaTi(SiO4)OMon. 2/m : P21/b
9.AG.15VanadomalayaiteCaV4+(SiO4)OMon.
9.AG.15ŻabińskiiteCa[Al0.5(Ta,Nb)0.5)](SiO4)OTric. 1
9.AG.20Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
9.AG.20Cerite-(La)(La,Ce,Ca)9(Fe,Ca,Mg)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
9.AG.20Aluminocerite-(Ce)(Ce,La,Ca)9(Al,Fe3+)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
9.AG.25Trimounsite-(Y)Y2Ti2(SiO4)O5Mon.
9.AG.25Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
9.AG.25Mieite-(Y)Y4Ti(SiO4)2O[F,(OH)]6Orth. mmm (2/m 2/m 2/m) : Cmcm
9.AG.30SitinakiteKNa2Ti4(SiO4)2O5(OH) · 4H2OTet.
9.AG.35KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
9.AG.40aNatisiteNa2Ti(SiO4)OTet.
9.AG.40bParanatisiteNa2Ti(SiO4)OOrth.
9.AG.45Törnebohmite-(Ce)(Ce,La)2Al(SiO4)2(OH)
9.AG.45Törnebohmite-(La)(La,Ce)2Al(SiO4)2(OH)
9.AG.50Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5
9.AG.55ChantaliteCaAl2(SiO4)(OH)4Tet. 4/m : I41/a
9.AG.60MozartiteCaMn3+(SiO4)(OH)Orth. 2 2 2 : P21 21 21
9.AG.60VuagnatiteCaAl(SiO4)(OH)Orth.
9.AG.65HatruriteCa3(SiO4)OTrig.
9.AG.70JasmunditeCa11(SiO4)4O2STet. 4 2m : I4m2
9.AG.75AfwilliteCa3(HSiO4)2 · 2H2OMon. m : Bb
9.AG.80BultfonteiniteCa2(HSiO4)F · H2OTric.
9.AG.85ZoltaiiteBaV4+2V3+12(SiO4)2O19Trig. 3 : P3
9.AG.90Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12Hex.

Fluorescence of NatrotitaniteHide

It shows pale orange cathodoluminescence but does not fluoresce under 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 NatrotitaniteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Stepanov, A.V., Bekenova, G.K., Levin, V.L. and Hawthorne, F.C. (2011) Natrotitanite, IMA 2011-033. CNMNC Newsletter No. 10, October 2011, page 2555.
A. V. Stepanov, G. K. Bekenova, V. L. Levin and F. C. Hawthorne (2012): Natrotitanite, ideally (Na0.5Y0.5)Ti(SiO4)O, a new mineral from the Verkhnee Espe deposit, Akjailyautas mountains, Eastern Kazakhstan district, Kazakhstan: description and crystal structure. Mineralogical Magazine, 76, 37-44.

Internet Links for NatrotitaniteHide

Localities for NatrotitaniteHide

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.
Kazakhstan (TL)
 
  • East Kazakhstan
    • Tarbagatai Range
      • Akzhaylyautas Mts (Akzhailyautas Mts; Akjaylautas Mts; Akzhalautas Mts)
A. V. Stepanov, G. K. Bekenova, V. L. Levin and F. C. Hawthorne (2012): Natrotitanite, ideally (Na0.5Y0.5)Ti(SiO4)O, a new mineral from the Verkhnee Espe deposit, Akjailyautas mountains, Eastern Kazakhstan district, Kazakhstan: description and crystal structure. Mineralogical Magazine, 76, 37-44.
Mineral and/or Locality  
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