Chrysothallite
A variety of Minerals
What is Chrysothallite?
Chrysothallite is a rare thallium-bearing chloride mineral with the formula K6Cu6TlCl17(OH)4•H2O. Chrysothallite is unique in being only the second mineral with essential trivalent thallium, a feature shared with natural thallium(III) oxide, avicennite. Another examples of natural thallium chlorides are steropesite, Tl3BiCl6, and lafossaite, TlCl. Chrysothallite is one of numerous fumarolic minerals discovered among fumarolic sites of the Tolbachik volcano, Kamchatka, Russia The mineral is named in allusion to its colour and thallium content.
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Key Characteristics
Composition of Chrysothallite
The crystal structure of chrysothallite is unique. Its building elements are: layer of distorted CuCl4(OH)2 octahedra, in which the octahedra share edges isolated Tl-centered TlCl6 octahedra isolated Tl-centered TlCl4(H2O)2 octahedra KCl6 and KCl9 polyhedra, that connect all the above elements
Quick Facts
Physical Properties
- Color
- Golden-yellow to light yellow
- Density
- 2.97 g/cm³
- Streak
- White
Chemical Properties
- Chemical Formula
- K6Cu6Tl3+Cl17(OH)4·H2O
- Elements
- Cl, Cu, H, K, O, Tl
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