Sandstone slab, large Quartz A small patch of lower-quality

A small patch of lower-quality chalcedony in one corner has a vivid geen reaction

Broken quartz crystals along the side of the piece have left a pattern of hexagons in red chalcedony of the base

including the flat breaks on the bottom

the white quartz layer fluoresces white and the calcite has a strong orange-red reaction with phosphorescence

Purple Rain specimens typically appear a murky dark purple-gray color under incandescent light (indoor lighting)

Sandstone slab, large Quartz A small patch of lower-qualityApprox size: 9 1 8 x 6 1 4" (12mm thick) Approx weight: 962g (2lb) The display side of the slab is polished; the reverse is unfinished and may have saw marks, uneven parts, or paler color. This flat polished slab of picture sandstone is made from Arizona Sierra sandstone sourced from central Arizona. Sandstone is a sedimentary rock composed of sand compacted and cemented together through geological processes, giving it a grainy texture. Sandstone with