1. Observe timely veins or timely veins: crystals are usually related to timeliness. If you see a timely vein or a timely vein on the mountain, there may be crystals.

2. Use the detector: The detector can detect the mineral content and structure underground, so as to judge whether there are crystals.

3. Use the detector: The detector can detect the mineral content and structure underground, so as to judge whether there are crystals.

4. Observing trachyte and basalt: Spherical inclusions sometimes appear in these rocks, and these inclusions may contain crystals. It should be noted that although the above methods may be helpful to judge whether there are crystals on the mountain, it still needs professional knowledge and skills to find and excavate crystals. In addition, before any excavation activities, we must understand and abide by local laws and regulations to ensure the legality and safety of the activities. At the same time, we should also pay attention to protecting the environment and avoid unnecessary damage to nature.