C is for Crackle,
or jamtlandsvav or jamtlandsdrall appeared in the November 1928 Bulletin put out by Mary M. Atwater. She found the Swedish name hard to understand or say, so she called it "Crackle Weave." Her thoughts were the background of the woven piece resembled the crackle of some pottery she had.
This is a twill based block weave. The blocks are a 3-point twill with an extra or 'incidental' to balance between non-consecutive blocks in order to preserve an odd-even progression. It is mostly woven in the overshot manner alternating pattern with tabby. The 4 shaft tie-up is usually a standard 2/2 twill.