The Teton Range as found in a piece of black agate, Mount Moran on the left, followed by a rising sun to its right, the Grand Teton, Middle Teton and the South Teton on the right. | Bill Schiess, EastIdahoNews.com “What is your favorite rock?” I have been asked that question many times, but last weekend at the Rexburg Farmers Market, I was asked four times. And on Saturday, while leading a field trip for the Idaho Falls Gem and Mineral Society, …