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FMF - Foro de Mineralogía Formativa.  Casiterita, dipirámides tetragonales en macla cíclica de seis individuos Cornwall 15mm.

CASSITERITE: FMF - Foro de Mineralogía Formativa. Casiterita, dipirámides tetragonales en macla cíclica de seis individuos Cornwall

CRYSTALS AND MINERALS | Cornwall     ✫ღ⊰n

CRYSTALS AND MINERALS | Cornwall ✫ღ⊰n

Cassiterite ranges in color from yellow to black, but it's generally dark. Its Mohs hardness is 6 to 7, and it's a rather heavy mineral. Despite its dark color, it yields a white streak. Cassiterite occurs in crystals like this specimen as well as in brown, banded crusts called wood tin. Because of its hardness and density, cassiterite may collect in placers, where it abrades into dark pebbles called stream tin. This mineral supported the tin industry of Cornwall for thousands of years.

Oxide Minerals

Cassiterite ranges in color from yellow to black, but it's generally dark. Its Mohs hardness is 6 to 7, and it's a rather heavy mineral. Despite its dark color, it yields a white streak. Cassiterite occurs in crystals like this specimen as well as in brown, banded crusts called wood tin. Because of its hardness and density, cassiterite may collect in placers, where it abrades into dark pebbles called stream tin. This mineral supported the tin industry of Cornwall for thousands of years.

Clinoclase from Cornwall, a Vintage Micromount.

Clinoclase from Cornwall, a Vintage Micromount.

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