It's impossible to say that any natural material *absolutely* does not mold. Mold thrives in damp, organic environments, and most natural materials have some organic components. However, some materials are naturally more resistant to mold than others.

Here are a few examples:

* Metals: Metals like copper, silver, and stainless steel are generally resistant to mold growth.

* Glass: Glass is inorganic and does not provide a food source for mold.

* Stone: Most stones, especially those with a low porosity like granite or marble, are naturally resistant to mold.

* Certain woods: Some hardwoods like cedar and redwood contain natural oils that are antimicrobial and can help deter mold growth.

Important Note: While these materials are more resistant, they can still become moldy under the right conditions, such as high humidity or prolonged exposure to water.

It's always important to maintain good hygiene practices to prevent mold growth in any material, regardless of its inherent resistance.