Deerfawn Jasper History: Deerfawn jasper has an interesting history – this stone was formed billions of years ago as a result of sedimentary processes. What actually happened was that the silica-rich minerals got deposited within veins and void spaces in the earth’s crust. Geologists claim that hydrothermal activity played a very crucial role in the formation of this jasper variety, and it allowed minerals to circulate and fill void spaces within sedimentary rocks.