Purple/blue Aura Crystal Quartz - [Note to self: sent to A. w/this msg: "Maybe all those lovely purple pieces in the pin you sent me yesterday have magically blended themselves into something like this?
740 ct OPAL BUTTE CRYSTAL with contra luz color plays,Morrow, Oregon This gem has the visual effect of being underwater when held to light. A combination of the facets, color plays and the opal itself.
Black Opal is Australia’s national gemstone. Found in the Lightning Ridge area in northwestern New South Wales, black opals are natural, solid stones that absorb scattered white light, giving it brilliant spectral colors.
science Rock Cycle - When picking rocks for hardscapes use Metamorphic rock, especially with water (so it doesn't leach anything into water) also important to know what type of rockscape animals may have evolved in.