The bands running through this freeform are a record of arrivals.
Silica-carrying water moved through volcanic rock in Madagascar and found empty space, either old gas bubbles set into the rock as it cooled or cracks opened up when the ground shifted. Silica came out of solution onto the walls of that space and built up in layers, working inwards until the space was full or the water stopped coming.
Cutting and polishing is what makes any of that legible. Sharp band edges mean the chemistry held steady while the layer went down. Blurred ones mean it was changing. A small sugary sparkle in a pocket is the last of the silica finishing as tiny quartz crystals rather than a smooth layer, because there was room left over at the end.
Mineral: Chalcedony (silicon dioxide, SiO₂), banded, so agate
Crystal system: Trigonal
Origin: Madagascar
Hardness: 6.5 to 7 on the Mohs scale; durable, though the polished surface will dull if knocked about
Treatment: None
Dimensions: 6.13 x 4.2 x 8.75 cm
Weight: 300 g
You will receive the exact piece photographed.