Desc :https://www.futureelectronics.com/m/ecs-inc. Quartz crystal has an internal structure that allows it to be used at very specific frequencies. When quartz crystal’s temperature changes, the frequency will change as well. When you operate quartz outside of the manufacturers’ specifications, the crystal will continue to resonate however it could become unstable among many other prominent issues that could cause the crystal to fail. https://youtu.be/kRnIK9xYoKU