Approximately 5g each stone.

Mahogany Obsidian is a volcanic rock that's silica-rich and contains undulating parts of oxidized Hematite or Magnetite, which are usually the colour of mahogany.

Mahogany Obsidian is said to be a gentler energy than Black Obsidian. I have read that Mahogany Obsidian is grounding and protective and is said to strengthen a weak aura.