Found approximately 10 miles west of Bozeman. The rock is transparent and if you hold a light to it you can clearly see through it. It is non-porous for the most part except where there is some calcium deposit.
"There is no single answer to the question of what color is Amber. This is because this natural resin comes in many different shades. This is another very fascinating fact about this natural gemstone. Up until today there are more than 250 different shades and 7 main colors of Amber identified. They vary from yellow to orange and even white. Green and blue colors are also distinguished; however, they tend to be very rare. All of these mentioned colors are commonly used when making jewelry. The major colors are Yellow Amber, Green Amber, Red Amber, Blue Amber & Black Amber."
Dave