This is Snowflake #24 in the book of 100 Snowflakes. Instructions on Page 55. Pictured on page 25 in Showcase.

Finished diameter: 3 in. (76 mm)
Thread required: 8 yd. (7.3 m)

“This decorative flake might float down with many others during a Kaavie, a Scottish term for a heavy snowfall.”

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