35mm x 17mm
Here is another example of a "Black" Usan agate. The distinctive, detailed and finely textured tube of escape can be observed in the middle-bottom of the nodule. This agate appears to show us a wintry frozen landscape and I love the indistinct centre. Perhaps this is the daydream world of a dying polar explorer, or a vision of the aftermath of a nuclear war. Ashen indeed.