This Cassiterite specimen is from Hemerdon Mine, Plympton, Devon with several sharp lustrous black crystals.
Cassiterite is a tin oxide mineral, SnO2 which is generally opaque, but is translucent in thin crystals. Its luster and multiple crystal faces produce a desirable gem. Cassiterite has been the chief tin ore throughout ancient history and remains the most important source of tin today.
|Origin||Hemerdon Mine, Plympton, Devon|