Stonehenge Bluestone Quarry Slab peaks These fractal patterns are known

These fractal patterns are known as hopper crystals

” Lunar and Planetary Science

A small information card is also included that also serves as the certificate of authenticity

The final impact emitted a booming explosion that was heard and felt for nearly 200 miles

" International Journal of Astrobiology

Stonehenge Bluestone Quarry Slab peaks These fractal patterns are knownThis specimen is a custom cut mini slab of bluestone recovered downstream from the quarry at Craig Rhos y Felin located on the northern flank of the Preseli Mountains near Pembrokeshire, Wales. Recent petrographic studies have closely linked chippings from these dolerite bluestones to the bluestones installed at Stonehenge roughly 4,500 years ago. Each mini slab is unique and varies in size and shape. As pictured, the slab is housed in a small acrylic