Chemistry:Tinaksite
From HandWiki
| Tinaksite | |
|---|---|
 Tinaksite (brown) and associated charoite (lilac). | |
| General | |
| Category | Silicate mineral |
| Formula (repeating unit) | K 2Na(Ca,Mn2+) 2TiO[Si 7O 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
7O
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
- ↑ 1.0 1.1 "Tinaksite Mineral Data". http://webmineral.com/data/Tinaksite.shtml.
- ↑ 2.0 2.1 "Tinaksite". http://www.mindat.org/min-3966.html.
- ↑ Mineralienatlas
- ↑ 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.
- ↑ "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.
 |  |
