This is Snowflake #22 in the book of 100 Snowflakes. Instructions on Page 54. Pictured on page 25 in Showcase.

“In the final design of the Nor’easter series, another layer of chains and double crochets is added, to create a large hexagonal snowflake.”

Finished diameter: 3 1/8 in. (79 mm)
Thread required: 11 yd. (10.1 m)

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