Emerald Quartz- small rough
These are fantastic for grid sets! Available in a variety of sizes, and super economical. Grids are a great way to get the energy of a big rock without spending the big bucks. For a full description of this wonderful find from Tanzania please read my blog post Hummingbird Quartz--Joyful Balance.
Weights from 1-11 grams. Sizes from approx 1/2 to 1 inch.