snowflake obsidian造句

• Snowflake obsidian has white spots against the black that resemble snowflakes , which is due to bubbles or crystal inclusions . some obsidian displays a strong iridescence and some have a sheen from within , similar to the sheen of moonstone
  也有可能是全部单色或有条纹或有斑点，最有名的是有彩虹闪光的彩虹黑曜岩rainbow obsidian ，并且有些。