Stalactitic chalcedony geode "The Abalone" Rhyolite blends into white and brown

blends into white and brown aragonite

then this variety of chalcopyrite is fool's bornite: it borrows its trade name from the closely related mineral bornite

75 x 2 x 1

** Brittle warning: Be careful putting pressure on crystals along the edge as they may dislodge from the specimen

This piece is particularly messy with mineral growth obscuring the form of the quartz

Stalactitic chalcedony geode "The Abalone" Rhyolite blends into white and brownLocale: Atlas Mountains, Morocco Approx dimensions: 5 x 4 x 2" Approx weight: 393g These unusual geodes from Morocco are like small caves lined with stalactites, botryoidal forms, and swirling agate patterns. While commonly called red chalcedony, I find the color is more orange to red orangeor in the case of this specimen, more brick red orange. Hematite causes this coloration, but later phases of growth (second generation) dont contain hematite