Fluorite also exhibits the property of thermoluminescence. Dating of the artefacts using the thermoluminescence technique resulted in 4420-3400 BCE dates. The approximate age of the fulgurite was determined using thermoluminescence (TL). Through the technique of thermoluminescence dating the artefacts were placed at 125,000 years old. Thermoluminescence dating in the caves support the findings. The site was dated to circa 92,000 BP, using Thermoluminescence. The thermoluminescence date for the pottery is 1528 BCE. Thermoluminescence dating is commonly used on ancient pottery and tools. As a crystalline material is heated during measurements, the process of thermoluminescence starts. Thermoluminescence re-emits previously absorbed electromagnetic radiation upon being heated (e.g., thermoluminescence dating). Therefore, at that point the thermoluminescence signal is zero. Thermoluminescence testing also dates items to the last time they were heated. Thermoluminescence monitoring reveals that storms can erode such beaches far more quickly. The lowest levels of the cave were radiocarbon dated and thermoluminescence dated to ca. Thermoluminescence dating is possible if the slag contains crystal elements such as quartz or feldspar.