Variscite is a relatively rare aluminum phosphate mineral closely related to turquoise in its chemical composition. Broken Arrow Variscite is one of many types located throughout  Nevada. It is known for its glassy emerald to light green color and often translucent appearance with a wide variety of pattern. Although softer than agate or jasper (somewhere around 5 on the Moh's scale) it takes a great polish and makes stunning finished pieces. 

Origin: Nevada

Dimensions: 2.5" x 1.25" and approximately 11 mm thick on the right tapering to 7 mm on the left.  Weight = 34 grams. 

Shown wet.  Not polished. Known flaws are shown as white lines in the final picture frame.