And if he makes from them prohibited jewelry or vessels, zakat is due on them. As for minerals, they are part of apparent wealth, and zakat is due on everything extracted from them—whether materials that can be worked, such as gold, silver, iron, lead, brass, and copper; or materials that cannot be worked, whether liquid, such as tar and naphtha, or stone, such as gemstones, antimony, and ochre—provided that what is extracted of gold and silver reaches the nisab after smelting and purification, or that the value of what is extracted of other minerals reaches the nisab. The amount due on what is extracted is one-quarter of a tenth, as with accumulated gold and silver and commercial merchandise. As for rikaz, it is any buried property consisting of pre-Islamic coinage, found in uncultivated land or on a public road; it belongs to whoever finds it