This is #66 in the book. Instructions are on Page 82. Pictured on Page 33 in the showcase.

This pattern adds a round of double crochets to the outer edge of Sea Ice I, transforming the fine lacy flake into a more substantial hexagonal crystal.

Finished diameter: 57mm (21/4in)
Thread required: 6.4m (7yd)

All pattern samples in this book are made with size 10 thread and a size 5 (1.9mm) hook