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including the flat breaks on the bottom
A small patch of lower-quality chalcedony in one corner has a vivid geen reaction
Purple Rain specimens typically appear a murky dark purple-gray color under incandescent light (indoor lighting)
Instead this prehnite is an opaque sand-colored sphere formed of radiating crystals terminating in thin
I detected weak to moderate phosphorescence that lingers several seconds (5+ secs) after exposure to 365nm
Sandstone slab, large Quartz including the flat breaks onApprox 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
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