If you place a crystal substance on a tabletop return to view it after some time passes and find it as a powdered substance processes most likely took effect?

The transformation of a crystal substance into a powdered form over time is likely due to mechanical weathering or physical abrasion. Factors such as vibrations, impacts, or even minor disturbances from handling or environmental conditions can contribute to the breakdown of the crystal structure. Additionally, if the crystal is hygroscopic, absorption of moisture could lead to changes that facilitate the powdering process.