This is #47 in the book 100 Snowflakes to Crochet. Instructions on Page 70. Pictured on Page 29 in the showcase.

This crystalline flower is the delicate first snowflake of the Sleet pair.

Finished diameter: 54mm (2 1/8in)
Thread required: 5.5m (6yd)

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