The existence of hematite (iron oxide) can develop purple and brown styles of obsidian, while little gas bubbles may perhaps develop a golden sheen. Dark bands or mottling in grey, green, or yellow are recognized for this interesting rock kind. ​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​... https://simonvxoje.ziblogs.com/28007769/black-metallic-material-with-silver-stone-color-no-further-a-mystery