Malachite

Malachite is a basic material with the appearance of long triangular tubes green color and a orange pearl effect.

Source
Malachite can be here:
 * Sylva
 * In Mountains and deep underground
 * Calidor
 * Trade Platform
 * 1 Malachite for every Scrap, up to 8 total

Uses
Malachite can be used to craft the following items:
 * In Smelting Furnace
 * Copper