Black Agate Tumbles #1 measure approximately 3/4" to 1 1/8" (18mm to 30mm) and measure approximately .6 to .8 ounces (14.3 to 20.1 grams). Many of these are not pure black; they have light blue, light gray, or white markings on them. Please let me pick one for you. These are $1.00 USD each.
Agate is another form of Chalcedony and therefore one of the Quartzes. It balances the yin-yang energy and also balances the physical, emotional, and intellectual bodies with the spiritual body. It cleanses and stabilizes your aura and not only dissolves negativity but transmutes it as well. This crystal allows you to step back and truly look at yourself and see if your situations are conducive to your well-being. Agate encourages our brain's analytical thinking abilities. This crystal encourages being true to your significant other.