This is Snowflake #40 in the book of 100 Snowflakes. Instructions are on Page 65. It is pictured on page 29 in the showcase.

“Rounded and encircled, this snowflake is named for the icy glaze formed on exposed objects during an ice storm.”

Finished diameter: 2 3/4 in (70 mm)
Thread required: 9 yd (8.2 m)

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