Hello, I have a few big pieces of mica from NJ, 1. is 1' L. x 11" w. x 3"  ht. the other 2 are a few inches smaller and the 4th one is only a few inches big, but it does not look like the pictures you have. They are similar, and the description kind of matches. When I first saw it I thought it was fools gold, because it is bright yellow in color like gold. But then I picked it up and it was flaky. I was wondering how to test it to find out if it is Lepidolite mica? this one is a medium one and it got a little bit of rust on it because it started raining and my husband put our tools in with it.