I have been working on a possible exhibition opportunity for a show about the 300th anniversary of Linnaeus. Researching Linnaeus I came across some references to his classing of minerals, fossils and crystals. In this case Linnaeus’s system was never adopted. I am thinking about combining it with the bowerbird’s classification of stones in bowers. I have some pics that I will add when I know how!
Make sure you get up early to hear the dawn chorus. For Perth that's about 0556 (around about or just shortly after nautical twilight).
For anywhere else in the world you can calculate your twilight here http://www.ga.gov.au/geodesy/astro/ (but you need to know your lat and long)