Rocky the Rock Sculpture, continued...

From a super reader (bf.)  [watch out for that triangular cleavage]
As I dimly recall (Geology 101), Central Park & most of the city has 2 major rock formations: sparkly mica schist & hornblend schist (triangular cleavage,I think).  But "Rocky" looks like one of the boulders--not "country rock"-- that got rolled over from New Jersey during the last glacial movement--maybe Palisades diabase? There's a great big one up at the Cloisters.
Bit of interest: the mica schist in our neck of the woods is not biotite mica (dark sparkle) but muscovite (white sparkle) so-called because the Russians used sheets of it for stoves that both warmed & illuminated. 

THANK YOU!!!  I love these things. 

Popular posts from this blog

Tulip Hunting In Central Park

Image
To some people, it may seem as though tulip hunting in Central Park is a very unchallenging pass time, since there are so many tulips available.  However, if you are searching for a particular yellow tulip, surrounded by buds of red and yellow compatriots, of the Parade type, and in a very specific general spot, and of a particular age, well then!  There is nothing like the rewards of discovering just this tulip, and capturing it on film. Tulip Hunter Succeeds! (Photo by Lara C. of Chicago).
Read More ->