Picacho Agate, Rough Rock, per lb Peach Mine The chemical formula for Black

The chemical formula for Black Tourmaline is NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

5 lb to 80 lb pieces

Between 18 mm and 23 mm long

and is all new rock

5" x 3" x 1

Picacho Agate, Rough Rock, per lb Peach Mine The chemical formula for BlackFrom Chihuahua, Mexico, Picacho Agate is a nodular agate with a rough outer matrix in irregular shapes with very few windows. Inner banding can contain parallax and typically features translucent and white agate, with possibility for yellow, blue, or purple coloring. Size range: 2" 6" pieces, with the largest individual nodules at approx. 3lbs Pictured both wet and dry, with examples of cut specimens. If you have a preference on the size or number of