2006.15.0090 (Quartz)

Quartz-Agate Medium in size agate formation known as "thunderball eggs" one polished face (half), bands of white chalcedony across rock and outlining edges, star shaped, middle filled with yellowish and blueish water looking substance encased in host rock, dull to vitreous luster, 7 on hardness scale; silicon dioxide Color: Brown, Blue