Quartz is a mineral that can be found in the Earth's crust and has some special properties. One of these properties is that it changes its shape when it gets really hot or really cold. This means that when quartz is heated up or cooled down, it can turn into a different shape.
When quartz is heated up, it expands and becomes bigger. This is called thermal expansion. When it cools down, it contracts and becomes smaller. This is called thermal contraction.
Now, there is a special temperature called the "inversion temperature". This is the temperature at which quartz changes from one shape to another. Below this temperature, quartz is in one shape and above it, quartz is in another shape. Basically, the molecules in quartz get rearranged at this temperature to form a new shape.
When quartz is heated up above the inversion temperature, it changes from one shape to another. This change is accompanied by a sudden change in volume, and this can cause cracks or fractures in the quartz. So, it's important to know the inversion temperature of quartz when heating or cooling it.
In summary, the quartz inversion is the temperature at which quartz changes its shape from one form to another. This change in shape can be accompanied by a sudden change in volume, which can lead to cracks or fractures in the quartz if not carefully controlled.