That's what I was thinking, but . . . .. . . . Wrong color for volcanic to my eye, the round one looks like granite. . . .
How is quartzite formed into granite?
Quartzite is a metamorphic rock that forms from the joining of sandstone and quartz under intense heat and pressure. ... Granite is a type of igneous rock that typically forms underneath continents. It forms when liquid magma cools into existing rock formations.Apr 25, 2017