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from Etsy

Black Dendritic Moss Honey Agate Semiprecious Gem Stone Cabochon, Brazilian gemstone, Yellow and Black mineral jewel, DIY jewelry component

cabochon of rhodochrosite, from Argentina, with PLUMES! At one side, this outstanding stone features wavy bands of glowing pink coloration. And the other side has honey-colored gel (calcite), very gemmy & translucent, which contains several beautifully ornate plumes with ghostly fortifications. Separating the two zones is a scalloped band of cream, with fancy little figures that resemble buds.

Boytroidal Chalcedony. Botryoidal (grape-like) structures manifest internally as "turtle-backing" or sometimes externally as "bubble-top" surfaces.