obsidian "celeste eye" of Mexico, renowned for the quality of its deposits. Glassy volcanic rock rich in silica. Grey, dark green, red or black, it comes from acid lava (rhyolite type). Its name comes from Obsius, a figure from ancient Rome who would have first reported the presence of this rock, in Ethiopia.
Malachite de Burra in Australia. Malachite was cited by Pliny in 77 AD. The name of this mineral comes from the Latin Malachites through the ancient Greek of moloch, a variant of malach, "mauve," in reference to its color similar to that of the mauve leaves.
Vegetable ivory, also known in Spanish tagua or corozo, is the albumen of the fruit of the ivory palm of tropical America (mainly the species of genus Phytelephas) but also of Africa (species of the genus Hyphaene). It is used to make small figurines or clothing buttons.
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