Tinaksite

Silicate mineral
K2Na(Ca,Mn2+)2TiO[Si7O18(OH)]IMA symbolTnk[1]Strunz classification9.DG.75Crystal systemTriclinicCrystal classPinacoidal (1)
(same H-M symbol)Space groupP1IdentificationColorPink, pale yellow, light brownCrystal habitFibrous, crystalline or prismatic, crystalline, or radial, crystallineCleavagePerfect in one direction, indistinct in one directionMohs scale hardness6LusterVitreous to glassyStreakWhiteDiaphaneityTransparent to translucentSpecific gravity2.82Optical propertiesBiaxial (+)Refractive indexnα = 1.593 nβ = 1.621 nγ = 1.666Birefringenceδ = 0.073References[2][3][4]

Tinaksite (chemical formula K2Na(Ca,Mn2+)2TiO[Si7O18(OH)])[3] is a mineral found in northern Russia. Tinaksite can be grayish-white, yellowish, orange, or brown,[2] 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. ^ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ a b "Tinaksite Mineral Data".
  3. ^ a b "Tinaksite".
  4. ^ Mineralienatlas
  5. ^ "TINAKSITE (Potasium Sodium Calcium Manganese Titanium Iron Oxide Silicate Hydroxide)".

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" (PDF). Zeitschrift für Kristallographie. 189 (1–4): 195–204. doi:10.1524/zkri.1989.189.14.195. S2CID 53544093.