[balrog666]

The granite/mica thing is new to me. I'll leave that one up to someone with a better background. Its just another creationist claim so outlandish as to make it difficult to counter.

Yes, it's just another creationist idiocy that depends on not understanding science. Granite is igneous rock - "300 million years" is a meaningless non-seqitur. Mica isn't composed of polonium. Polonium isotopes are daughter products of various radioactive decay trains and granites are relatively radioactive rock. Other than that Mrs. Lincoln...

[longshadow]

The argument being advanced appears to be based on the "halos" associated with damage caused by radioactive Polonium as proposed by Gentry.

A nice rebuttal of the Gentry's notion that the "halos" disprove an old earth age can be seen HERE:

http://www.talkorigins.org/faqs/po-halos/gentry.html