Chalcedony rough, Mojave Desert, CA is available, Stock #515. The color is mainly white but some may contain moss with pink, green or other colors in the stone. Sizes will be approximately from 1/2 – to 4 pounds plus per piece. One pound is an order. The translucent material can contain some nice surprizes with it”s banding or other patterns as shown in the image. The Mohs scale of hardness for chalcedony usually runs 6.5-7.