and, yes, the way I know it, it is raspberry stitch, but if there is a difference to blackberry stitch I would look more puzzled than ever quote]
Nice work! I believe this stitch is also known as the popcorn stitch and bramble stitch, among others...4 rows for pattern: Row 1: purl across; Row 2: p3 together, k1, p1, k1 in same stitch; Row 3: purl across: Row 4: k1, p1, k1 in same stitch, p3 together.
I'm working on the Cable Bramble Afghan and slip the first stitch purlwise and knit the last stitch. If I can get my camera to work I'll post a photo later today.