This is Snowflake #29 in the book of 100 Snowflakes. Instructions on Page 58. Pictured on page 26 in Showcase.

“This light and lacy flake, the first of the Ice Crystal series, is composed of a simple sequence of chains, slip stitches, and single crochets.”

Finished diameter: 2 1/4 in. (57 mm)
Thread required: 6 yd. (5.5 m)

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