If the buried wealth—or any portion of it—carries Muslim markings, or carries no markings at all, it is treated as luqṭa (found property).

The share taken as zakat from rikāz is to be spent on the collective interests of the Muslims, exactly as the revenues of fayʾ are disbursed.

From the discussion so far it is evident that the items brought forth from the earth fall into four categories:

1. Grain and fruit;
2. Minerals of every kind;
3. Honey;
4. Buried treasure (rikāz).

All of these are included in the Almighty’s words, “Spend of the good things you have earned and of what We bring forth for you from the earth” (Qur’an 2:267), and in His words, “Give its due on the day of harvest” (Qur’an 6:141).

Zakat is only obligatory on those grains and fruits that are measured by volume and can be stored. Whatever is neither measured in that manner nor stored is exempt—such as walnuts, apples, peaches, quinces, pomegranates, and all vegetables and greens: radish, garlic, onions, carrots, melons, snake cucumbers, cucumbers, eggplants, and the like. This is based on the hadith traced back to ʿAlī, “There is no charity on greens,” narrated by al-Dāraqutnī, and on the Prophet’s, peace and blessings be upon him, statement: “No charity is due on less than five wasqs.”