Obsidian is usually black but comes in quite a range of colours, brown, blue, green, rainbow, red-black, silver and gold-sheen. It is very shiny, glass-like and opaque. It is quite common and available worldwide as is molton lava that has cooled so quickly it hasn't had time to cystallize. I use Snowflake Obsidian and sometimes Mahogany, as far as it attributes however it works very fast and with great power. Look into further as each colour has it own effects.
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