This is Snowflake #45 in the book of 100 Snowflakes. Instructions are on Page 68. It is pictured on page 28 in the showcase.

“Aufeis is a term for the layered ice that forms in Arctic stream beds - as water emerges on top of the existing ice, it freezes, and another layer forms.”

Finished diameter: 2 1/2 in (64 mm)
Thread required: 7 yd (6.4 m)

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