description Cassiterite Overview
Cassiterite is the naturally occurring mineral form of tin(IV) oxide, with the chemical formula SnO₂, and it is the principal ore of tin. It is usually brown, reddish brown, black, or otherwise dark, with a tetragonal crystal structure, Mohs hardness of about 6 to 7, and a high specific gravity near 7. Cassiterite occurs in hydrothermal veins and granite-related deposits as well as weathering-resistant placer deposits; transparent crystals from places such as Bolivia can be cut as rare collector gemstones.
help Cassiterite FAQ
What is cassiterite’s chemical formula?
Cassiterite is tin(IV) oxide, with the chemical formula SnO₂. It is the naturally occurring mineral form of this compound.
Why is cassiterite important?
Cassiterite is the principal ore of tin. Tin producers extract the metal from cassiterite-bearing deposits for use in products such as alloys, solder, and coatings.
What color is cassiterite?
Cassiterite is commonly brown, reddish brown, or black, although its appearance can vary. Its dark colors and high specific gravity are useful clues when identifying specimens.
How hard is cassiterite?
Cassiterite has a Mohs hardness of about 6 to 7. It also has a tetragonal crystal structure, which helps distinguish it from some other dark metallic-looking minerals.
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