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Indusium reniform, or orbicular with a narrow sinus.

The reniform masses are known as kidney ore.

Native arsenic is usually found as granular or curvilaminar masses, with a reniform or botryoidal surface.

It lies beyond the orbicular spot, and is usually somewhat kidney-shaped, and is consequently named the reniform.

P. thin, flexible, reniform, cinnamon then pale, broken up into scurfy squamules; g. determinate, thin, reticulately joined, cinnamon; s. lateral, very short, dilated into the p.; sp.