Tinaksite

Tinaksite (brown) and associated charoite (lilac).

General
Category| Silicate mineral
Formula
(repeating unit)| K
2Na(Ca,Mn2+)
2TiO[Si

18(OH)]
Strunz classification| 9.DG.75
Crystal system| Triclinic
Crystal class| Pinacoidal (1)
(same H-M symbol)
Space group| P1
Identification
Color| Pink, pale yellow, light brown
Crystal habit| Fibrous, crystalline or prismatic, crystalline, or radial, crystalline
Cleavage| Perfect in one direction, indistinct in one direction
Mohs scale hardness| 6
|re|er}}| Vitreous to glassy
Streak| White
Diaphaneity| Transparent to translucent
Specific gravity| 2.82
Optical properties| Biaxial (+)
Refractive index| nα = 1.593 nβ = 1.621 nγ = 1.666
Birefringence| δ = 0.073
References| [1][2][3]

Tinaksite (chemical formula K
2Na(Ca,Mn2+)
2TiO[Si

18(OH)])[2] is a mineral found in northern Russia. Tinaksite can be grayish-white, yellowish, orange, or brown,[1] and it is often found in charoite.[5] Its name is derived from its composition: titanium (Ti), sodium (Na) potassium (K) and silicon (Si). The International Mineralogical Association first recognized tinaksite as a mineral in 1965.

## References

1. ↑ 1.0 1.1 "Tinaksite Mineral Data". http://webmineral.com/data/Tinaksite.shtml.
2. ↑ 2.0 2.1 "Tinaksite". http://www.mindat.org/min-3966.html.
3. ↑ Mineralienatlas
4. ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
5. ↑ "TINAKSITE (Potasium Sodium Calcium Manganese Titanium Iron Oxide Silicate Hydroxide)". http://www.galleries.com/minerals/silicate/tinaksit/tinaksit.htm.

## External links

* Rozhdestvenskaya, I. V.; Nikishova, L. V.; Lazebnik, Y. D.; Lazebnik, K. A. (1989). "The crystal structure of tokkoite and its relation to the structure of tinaksite". Zeitschrift für Kristallographie 189 (1–4): 195–204. doi:10.1524/zkri.1989.189.14.195. http://rruff.geo.arizona.edu/doclib/zk/vol189/ZK189_195.pdf.

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