This is Snowflake #81 in the book of 100 Snowflakes. Instructions are on Page 93. Pictured on page 36 in Showcase.

“The feathery edges of this snowflake look like ice feathers, a name given to thick, feathery frost formations.”

Finished diameter: 3-1/4 in. (83 mm)
Thread required: 13 yd (11.9 m)

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