Tourmaline in Quartz $3.00

These specimens feature black tourmaline (schorl) embedded within clear or milky quartz (SiO₂), combining two common rock-forming minerals in a single polished stone. The striking contrast of dark, needle-like tourmaline inclusions within a lighter quartz matrix makes it a visually distinct and geologically informative sample. Features: Composition: The quartz is composed of silicon dioxide, while the tourmaline is a complex borosilicate mineral rich in iron, giving it a black appearance. Both minerals are durable and commonly found together in metamorphic and igneous environments. Appearance: Tourmaline appears as black rods or streaks—often radiating or intersecting—within translucent or opaque quartz. The tumbled finish highlights this natural contrast and enhances surface smoothness. Formation: Forms in high-temperature environments such as granite pegmatites or regional metamorphic rocks, where tourmaline crystals grow within silica-rich fluids that later solidify into quart