And that was just the first question. Many rocks and minerals can be visually similar to others. A general location is helpful in pinning down what it may be, but not always.
Based on the provided images, and no other information, I can only put out a few guesses. I have seen similar greenish clear seam agate. I have also seen glass slag similar in color and appearance. Another that comes to mind is any of several geode beds that have predominantly greenish hues. I can count a few I have been to in Oregon, Idaho, and Nevada that could have something similar. There are other possibilities, based on the images, that I am sure others will post.
This is why questions concerning location and circumstances are asked. Far too many samples look similar.
Time for more coffee.