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Tellurium slags primarly consist of oxides of silicon, aluminium, calcium and iron, in a glass-like, mostly amorphous matrix. Tellurium slag solidifies from a reaction melt if the temperature drops below ca. 1100-1600°C. The slag is crushed and grains or lumps with sizes ranging from a few millimeters to several centimeters are obtained. Slag grains can be mixed with sand, which may be used for lining the reaction vessel and which then adheres to the cooled slag (ESIS).
Tellurium slag is a product of treating molten lead with sodium salts. Consists primarily of sodium-tellurium salts in various states of oxidation. No molecular formula is available for slags, tellurium. (U.S. EPA, substance registry service)

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Physical state at 20°C and 1013 hPa:

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