Sitinakite
A valid IMA mineral species
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About Sitinakite
Formula:
KNa2Ti4(SiO4)2O5(OH) · 4H2O
Colour:
Colourless, light-brown to pale rose, pinkish brown
Lustre:
Vitreous
Hardness:
4½
Specific Gravity:
2.86
Crystal System:
Tetragonal
Name:
The name reflects its composition: silicon (Si), titanium (Ti), sodium (Na) and potassium (K).
This page provides mineralogical data about Sitinakite.
Unique Identifiers
Mindat ID:
3677
Long-form identifier:
mindat:1:1:3677:7
GUID
(UUID V4):
(UUID V4):
b6229b11-c549-40ff-ac7b-f948a94d8ef1
IMA Classification of Sitinakite
Approved
IMA Formula:
KNa2Ti4Si2O13(OH) · 4H2O
Approval year:
1989
First published:
1992
Classification of Sitinakite
9.AG.30
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
52.4.11.1
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
4 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] and/or >[6] coordination
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference |
|---|---|---|
| Sit | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Sitinakite
Vitreous
Transparency:
Transparent, Translucent
Colour:
Colourless, light-brown to pale rose, pinkish brown
Streak:
White
Hardness:
4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
{100} and {001}
{100} and {001}
Density:
2.86(6) g/cm3 (Measured) 2.89 g/cm3 (Calculated)
Optical Data of Sitinakite
Type:
Uniaxial (+)
RI values:
nω = 1.780(3) nε = 1.988(3)
Max Birefringence:
δ = 0.208
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Chemistry of Sitinakite
Mindat Formula:
KNa2Ti4(SiO4)2O5(OH) · 4H2O
Common Impurities:
Ca,Sr,Ba,Ce,Fe,Nb,Ta,Zr,TR
Crystallography of Sitinakite
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
P42/mcm
Setting:
P42/mcm
Cell Parameters:
a = 7.819(2) Å, c = 12.099(4) Å
Ratio:
a:c = 1 : 1.547
Unit Cell V:
739.69 ų (Calculated from Unit Cell)
Z:
2
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.84 Å | (100) |
| 6.02 Å | (100) |
| 3.25 Å | (80) |
| 2.003 Å | (70) |
| 2.608 Å | (60) |
| 3.36 Å | (50) |
| 2.805 Å | (50) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Near-surface Processes | |
| 22 : Hydration and low-𝑇 subsurface aqueous alteration (see also #23) |
Type Occurrence of Sitinakite
Co-Type Localities:
General Appearance of Type Material:
Equant and short prismatic crystals, 1 x 1 x 2 mm, and in 3-4 mm patches of intergrown crystals.
Place of Conservation of Type Material:
Geology Museum, Kola Branch, Academy of Sciences, Apatity, Mining Institute, St. Petersburg, Russia, 2021/1; The Natural History Museum, London, England, 1994,31.
Geological Setting of Type Material:
In hydrothermal natrolite nodules in alkalic pegmatites.
Associated Minerals at Type Locality:
Reference:
Men´shikov, Y.P., Sokolova, E.V., Egorov-Tismenko, Y.K., Khomyakov, A.P., Polezhaeva, L.I. (1992) Sitinakite Na2KTi4Si2O13(OH)·4H2O - a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 121(1), 94-99.
Synonyms of Sitinakite
Other Language Names for Sitinakite
Common Associates
Associated Minerals Based on Photo Data:
| 4 photos of Sitinakite associated with Lemmleinite-K | K2(Ti,Nb)2(Si4O12)(OH,O)2 · 4H2O |
| 3 photos of Sitinakite associated with Sazykinaite-(Y) | Na5YZr[SiO3]6 · 6H2O |
| 3 photos of Sitinakite associated with Aegirine | NaFe3+Si2O6 |
| 1 photo of Sitinakite associated with Rhabdophane-(Ce) | Ce(PO4) · 0.6H2O |
| 1 photo of Sitinakite associated with Deloneite | (Na0.5REE0.25Ca0.25)(Ca0.75REE0.25)Sr1.5(CaNa0.25REE0.25)(PO4)3F0.5(OH)0.5 |
| 1 photo of Sitinakite associated with Amicite | K2Na2Al4Si4O16 · 5H2O |
Related Minerals - Strunz-mindat Grouping
| 9.AG. | Ivanyukite-Na-T | Na2Ti4(SiO4)3(OH)O3 · 7H2O |
| 9.AG. | Ivanyukite-Na-C | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG. | Edgrewite | Ca9(SiO4)4F2 |
| 9.AG. | Aluminotaipingite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3 |
| 9.AG.02 | Gatedalite | ZrMn2+2Mn3+4SiO12 |
| 9.AG.05 | Abswurmbachite | CuMn3+6(SiO4)O8 |
| 9.AG.05 | Braunite | Mn2+Mn3+6(SiO4)O8 |
| 9.AG.05 | Neltnerite | CaMn3+6(SiO4)O8 |
| 9.AG.05 | Braunite-II | CaMn3+14(SiO4)O20 |
| 9.AG.10 | Långbanite | Mn2+4Mn3+9Sb5+O16(SiO4)2 |
| 9.AG.12 | Taipingite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3 |
| 9.AG.15 | Malayaite | CaSn(SiO4)O |
| 9.AG.15 | Titanite | CaTi(SiO4)O |
| 9.AG.15 | Vanadomalayaite | CaV4+(SiO4)O |
| 9.AG.15 | Natrotitanite | (Na0.5Y0.5)Ti(SiO4)O |
| 9.AG.15 | Żabińskiite | Ca[Al0.5(Ta,Nb)0.5)](SiO4)O |
| 9.AG.20 | Cerite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Ferricerite-(LaCa) | (La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Aluminocerite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3 |
| 9.AG.25 | Trimounsite-(Y) | Y2Ti2(SiO4)O5 |
| 9.AG.25 | Yftisite-(Y) | (Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6 |
| 9.AG.25 | Mieite-(Y) | Y4Ti(SiO4)2O[F,(OH)]6 |
| 9.AG.35 | Kittatinnyite | Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O |
| 9.AG.40a | Natisite | Na2Ti(SiO4)O |
| 9.AG.40b | Paranatisite | Na2Ti(SiO4)O |
| 9.AG.45 | Törnebohmite-(Ce) | Ce2Al(SiO4)2(OH) |
| 9.AG.45 | Törnebohmite-(La) | La2Al(SiO4)2(OH) |
| 9.AG.50 | Kuliokite-(Y) | Y4Al(SiO4)2(OH)2F5 |
| 9.AG.50 | Ivanyukite-Na | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG.50 | Ivanyukite-K | K2Ti4(SiO4)3(OH)2O2 · 9H2O |
| 9.AG.50 | Ivanyukite-Cu | CuTi4(SiO4)3(OH)2O2 · 7H2O |
| 9.AG.50 | Hydroxyledgrewite | Ca9(SiO4)4(OH)2 |
| 9.AG.52 | Ulfanderssonite-(Ce) | (Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3 |
| 9.AG.55 | Chantalite | CaAl2(SiO4)(OH)4 |
| 9.AG.60 | Mozartite | CaMn3+(SiO4)(OH) |
| 9.AG.60 | Vuagnatite | CaAl(SiO4)(OH) |
| 9.AG.65 | Hatrurite | Ca3(SiO4)O |
| 9.AG.70 | Jasmundite | Ca11(SiO4)4O2S |
| 9.AG.75 | Afwillite | Ca3(HSiO4)2 · 2H2O |
| 9.AG.80 | Bultfonteinite | Ca2(HSiO4)F · H2O |
| 9.AG.85 | Zoltaiite | BaV4+2V3+12(SiO4)2O19 |
| 9.AG.90 | Tranquillityite | (Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12 |
Fluorescence of Sitinakite
Not fluorescent
Other Information
Notes:
No dissolution observed in H2O, HCl, or HNO3 at room temperature.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Sitinakite
mindat.org URL:
https://www.mindat.org/min-3677.html
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References for Sitinakite
Reference List:
Men´shikov, Y. P., Sokolova, E. V., Egorov-Tismenko, Y. K., Khomyakov, A. P., Polezhaeva, L. I. (1992) Sitinakite Na2KTi4Si2O13(OH)·4H2O - a new mineral. Zapiski Vserossijskogo Mineralogicheskogo Obshchestva, 121 (1) 94-99
Localities for Sitinakite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Russia | |
| Arzamastsev et al. (2008) |
| [AmMin 85:1844] +2 other references | |
| Men´shikov et al. (1992) +2 other references |
| Men´shikov et al. (1992) +2 other references |
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Kukisvumchorr Mt, Khibiny Massif, Murmansk Oblast, Russia