Obsidian

Generally, obsidian in blue form appears as a pale blue rock form that looks very much like glass.It is a silica rich volcanic rock and occurs when...

Generally, obsidian in green blue form appears as a pale blue rock form that looks very much like glass.It is a silica rich volcanic rock and occur...

Generally, obsidian in blue form appears as a pale blue rock form that looks very much like glass.It is a silica rich volcanic rock and occurs when...