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Ivanyukite-Na-T

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Formula:
Na2Ti4(SiO4)3(OH)O3 · 7H2O
System:
Trigonal
Colour:
Colorless to pale brown
Hardness:
4
Name:
Named in honor of Gregory Yur’evich Ivanyuk, Russian mineralogist and petrologist, head of the Laboratory of Self-Organized Mineral Systems in the Geological Institute of the Kola Science Centre of the Russian Academy of Sciences.
A polytype of Ivanyukite-Na

Classification of Ivanyukite-Na-T

Approved
Approval Year:
2007
mindat.org URL:
http://www.mindat.org/min-39652.html
Please feel free to link to this page.

Type Occurrence of Ivanyukite-Na-T

General Appearance of Type Material:
cubic crystals, up to 1.5 mm in diameter
Geological Setting of Type Material:
low-temperature hydrothermal mineral crystallized from supersaturated Na-rich aqueous solutions; precursor to other ivanyukites (by partial hydration and cation exchange)

Physical Properties of Ivanyukite-Na-T

Vitreous
Diaphaneity (Transparency):
Transparent
Colour:
Colorless to pale brown
Streak:
White
Hardness (Mohs):
4
Tenacity:
Brittle
Cleavage:
Perfect
on {1011}
Fracture:
Step-Like
Density:
2.70 g/cm3 (Measured)    2.58 g/cm3 (Calculated)

Crystallography of Ivanyukite-Na-T

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 10.921(3) Å, c = 13.885(4) Å
Ratio:
a:c = 1 : 1.271
Unit Cell Volume:
V 1,434.17 ų (Calculated from Unit Cell)
Z:
3
X-Ray Powder Diffraction Data:
d-spacingIntensity
7.88(100)
3.277(60)
3.175(80)
2.730(50)
2.607(70)
2.471(50)
1.960(60)
1.916(50)

Optical Data of Ivanyukite-Na-T

Type:
Uniaxial (+)
RI values:
nω = 1.760() nε = 1.850(9)
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Ivanyukite-Na-T

Formula:
Na2Ti4(SiO4)3(OH)O3 · 7H2O
All elements listed in formula:
Analytical Data:
electron microprobe, wt.%, water amount by the Penfield method; empirical formula basis: Si + Al = 3 apfu
Na2O 7.46
Al2O3 0.07
SiO2 23.75
SO3 0.00
K2O 5.89 
CaO 0.21
TiO2 38.89
MnO 0.05
FeO 0.54
CuO 0.00
SrO 0.00
Nb2O5 2.99
BaO 0.14
H2O 19.00

total 98.99
Empirical Formula:
(Na1.82K0.95Ca0.03Ba0.01)∑2.81[(Ti3.68Nb0.17Fe0.06Mn0.01)∑3.92(Si2.99Al0.01)∑3.00O14.59(OH)1.37]·7.29H2O

Other Information

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 Ivanyukite-Na-T

Reference List:
Victor N. Yakovenchuk, Alexander P. Nikolaev, Ekaterina A. Selivanova, Yakov A. Pakhomovsky, Julia A. Korchak, Dar’ya V. Spiridonova, Oleg A. Zalkind, and Sergey V. Krivovichev (2009): Ivanyukite-Na-T, ivanyukite-Na-C, ivanyukite-K, and ivanyukite-Cu: New microporous titanosilicates from the Khibiny massif (Kola Peninsula, Russia) and crystal structure of ivanyukite-Na-T. American Mineralogist: 94: 1450–1458.

Internet Links for Ivanyukite-Na-T

Localities for Ivanyukite-Na-T

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Russia (TL)
 
  • Northern Region
    • Murmanskaja Oblast'
      • Kola Peninsula
        • Khibiny Massif
          • Koashva Mt
American Mineralogist, Volume 94, pages 1450–1458, 2009
Mineral and/or Locality  
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