In the space just above ^^^^^^^^^^^^the box your typed text appears there is a square icon which when pressed lets you insert an url for your image from most devices.^^^^^^^you can post it in this thread or edit your first post. Press the sqare icon which looks like a TV or a polaroid. It will give you a prompt.
Mine says choose file or type in url. Good luck. Purple quartz is amethyst. Thin white layer is agate. Haven't figured out, the red and black. I think the host rock is basalt but...