This snowflake is a single motif from the "Marguerite" doily pattern in Judith Connor's book "Tatting Adventures with beads, shuttle and needle". I love the look of the block tatted tips. You can see from the book cover (below) that she uses smaller picots in the center rosette for a slightly different look, just like Myra Piper's snowflake #4 I posted in January. Also, because I use longer decorative picots, I joined the block to the round below it. The joins will straighten up when I starch and pin it.
When I looked the book up on Amazon I discovered it's now out of print. Hopefully it will be reprinted soon as the used copies are quite pricey and it's a nice little book - her descriptions of different techniques are good, and while there are not a lot of patterns, there seems to be one of pretty much everything - a snowflake, a round motif, a heart (included in my Feb 14 post), a couple edgings, doilies, celtic tatting, covered egg ornament, etc.
(Reminder: books are all amazon affiliate links.)