Casiterita en Bruto 250gr Perú | Mineral de Colección | Rocas & Cristales

250g raw cassiterite. This piece is a beautiful specimen of cassiterite, measuring 65 x 50 x 40 mm, from Peru. It consists of a cluster of intense black crystals with well-defined faces and edges. Small white crystals add a touch of visual interest. This is a high-quality stone, ideal for collectors. Cassiterite is the mineral form of tin oxide. It is often found alongside wolframite, scheelite, and mispickel. It typically contains 87% tin and 21% oxygen (in addition to tantalum, iron, and other minerals). It is extremely hard, heavy, and brittle, but resistant to acids. Origin: Peru