Ocean Jasper

What is Ocean Jasper?

It is believed to be formed by alteration and silicification of volcanic rhyolite tuffs. Very little research has been completed on this rock type to definitively explain its petrogenesis. The myriad of colors are due to impurities and vary depending on the location it was found. 

Under the Microscope

The black and white tones of quartz in cross-polarized light are a striking contrast to the earthy greens, pinks, and whites in hand sample that ocean jasper is known for. The center of the spherulites have a very-fine, cryptocrystalline core with a thin-dark rim full of oxides and other opaque trace minerals. The outer radiating quartz creates a sunflower appearance that is show-cased in all the designs.