Paranatisite Mineral Data

Paranatisite Mineral Data +

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General Paranatisite Information

Chemical Formula:

Na2[TiO(SiO4)]

Composition:

Molecular Weight = 201.94 gm

Sodium 22.77 % Na 30.69 % Na₂O

Titanium 23.71 % Ti 39.56 % TiO₂

Silicon 13.91 % Si 29.75 % SiO₂

Oxygen 39.61 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Na₂TiO(SiO₄)

Environment:

In ultra-agpaitic pegmatites in a di®erentiated alkalic massif.

IMA Status:

Approved IMA 1992

Locality:

Yukspor Mountain, Khibiny alkaline complex, Kola Peninsula, Russia Link to MinDat.org Location Data.

Name Origin:

From the Greek para, for near, and its relation to natisite.

Synonym:

IMA1990-016

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Paranatisite Crystallography

Axial Ratios:

a:b:c =1.9127:1:2.0439

Cell Dimensions:

a = 9.181, b = 4.8, c = 9.811, Z = 2; V = 432.36 Den(Calc)= 1.55

Crystal System:

Orthorhombic - PyramidalH-M Symbol (mm2) Space Group: P mc2₁

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.748(1), 1.443(0.35), 1.475(0.33),

Crystal Structure:

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Sokolova E V , Hawthorne F C , The Canadian Mineralogist , 40 (2002) p.947-960, Reconsideration of the crystal structure of paranatisite and the crystal

Physical Properties of Paranatisite

Cleavage:

None

Color:

Yellow, Orange brown, Orange.

Density:

3.12

Diaphaniety:

Transparent to Translucent

Hardness:

5 - Apatite

Luster:

Vitreous - Adamantine

Streak:

white

Optical Properties of Paranatisite

Gladstone-Dale:

CI meas= 0.129 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.752 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.483,KPDmeas= 0.24,KC= 0.2757

Optical Data:

Biaxial (+), a=1.74, b=1.741, g=1.765, bire=0.0250, 2V(Calc)=24, 2V(Meas)=20-23.

Calculated Properties of Paranatisite

Electron Density:

r_electron=3.03 gm/cc
note: r_Paranatisite=3.12 gm/cc.

Fermion Index

Fermion Index = 0.03734
Boson Index = 0.96266

Photoelectric:

PE_Paranatisite= 4.79 barns/electron
U=PE_Paranatisite x r_electron= 14.51 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Paranatisite is Not Radioactive

Paranatisite Classification

Dana Class:

52.4.4.2 (52)Nesosilicate Insular SiO4 Groups and O, OH, F, and H2O

(52.4)with cations in [6] and/or > [6] coordination

(52.4.4)Natisite - Yftisite group

52.4.4.1 Natisite Na2(TiO)SiO4 P 4/nmm 4/m 2/m 2/m

52.4.4.2 Paranatisite Na2[TiO(SiO4)] P mc2₁ mm2

52.4.4.3 Yftisite-(Y)? (Y,Dy,Er)4(Ti,Sn)O(SiO4)2(F,OH)6 C mcm 2/m 2/m 2/m

Strunz Class:

VIII/B.13-05 VIII - Silicates

VIII/B - Nesosubsilicates, with anions unfamiliar to tetraheders, cationes with coordinationnumber between [8] and [12]

VIII/B.13 - Natisite series

VIII/B.13-05 Paranatisite Na2[TiO(SiO4)] P mc2₁ mm2

VIII/B.13-10 Natisite Na2(TiO)SiO4 P 4/nmm 4/m 2/m 2/m

Other Paranatisite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Am.Min.,Vol.79, p764 and Vol 88, p 479) OPTIC PROP.(Am.Min.,Vol.79,p764,1994)

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Paranatisite

Na2[TiO(SiO4)]
Dana No: 52.4.4.2 Strunz No: VIII/B.13-05
Locality:

Notes: