Tienshanite

Last updated
Tienshanite
Tienshanite.jpg
General
Category Cyclosilicate
Formula
(repeating unit)
KNa3(Na,K,[])6(Ca,Y,RE)2Ba6(Mn2+,Fe2+,Zn,Ti)6
(Ti,Nb)6Si36B12O114[O5.5(OH,F)3.5]F2
Strunz classification 9.CL.05
Crystal system Hexagonal
Crystal class Dipyramidal (6/m)
H-M symbol: (6/m)
Space group Hexagonal
Space group: P6/m
Identification
Colorolive-green
Mohs scale hardness6 - 6 12
Luster vitreous
References [1] [2]

Tienshanite, named for the Tian Shan Range in Mongolia, is a rare borosilicate mineral, though rock-forming in some parts of its original locality at the Dara-i-Pioz Glacier in Tajikistan. [1] [2] [3] Its formula is extremely complex: KNa3(Na,K,[])6(Ca,Y,RE)2Ba6(Mn2+,Fe2+,Zn,Ti)6(Ti,Nb)6Si36B12O114[O5.5(OH,F)3.5]F2. [4]

Tian Shan system of mountain ranges located in Central Asia

The Tian Shan, also known as the Tengri Tagh, meaning the Mountains of Heaven or the Heavenly Mountain, is a large system of mountain ranges located in Central Asia. The highest peak in the Tian Shan is Jengish Chokusu, at 7,439 metres (24,406 ft) high. Its lowest point is the Turpan Depression, which sits at 154 m (505 ft) below sea level.

Mongolia Landlocked country in East Asia

Mongolia is a landlocked country in East Asia. Its area is roughly equivalent with the historical territory of Outer Mongolia, and that term is sometimes used to refer to the current state. It is sandwiched between Russia to the north and China to the south, where it neighbours the Inner Mongolia Autonomous Region. Mongolia does not share a border with Kazakhstan, although only 37 kilometres (23 mi) separates them.

Glacier Persistent body of ice that is moving under its own weight

A glacier is a persistent body of dense ice that is constantly moving under its own weight; it forms where the accumulation of snow exceeds its ablation over many years, often centuries. Glaciers slowly deform and flow due to stresses induced by their weight, creating crevasses, seracs, and other distinguishing features. They also abrade rock and debris from their substrate to create landforms such as cirques and moraines. Glaciers form only on land and are distinct from the much thinner sea ice and lake ice that form on the surface of bodies of water.

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This list gives an overview of the classification of minerals (silicates) and includes mostly IMA recognized minerals and its groupings. This list complements the alphabetical list on List of minerals (complete) and List of minerals. Rocks, ores, mineral mixtures, non-IMA approved minerals and non-named

References

  1. 1 2 Mindat.org - Tienshanite
  2. 1 2 Webmineral.com - Tienshanite
  3. Handbook of Mineralogy - Tienshanite
  4. Cooper M. A., Hawthorne F. C. and Grew E. S. 1998: Refinement of the crystal structure of tienshanite: short-range-order constrains on chemical composition. The Canadian Mineralogist, 36, pp. 1305-1310