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How do I differentiate obsidian and onyx beads/chips?

Is there any test that I can do to tell if the black mineral chips i have for jewelry making are obsidian or onyx? Or any easy way to tell the difference? Thank you!

<>Probably the best way would be specific gravity...let me see if I can get more info...
There appears to be differences in both specific gravity and hardness. No having any gemological knowledge, I'm not sure how to measure these and the sites I perused don't give much info. I did, however, find this lady who seems to know her stuff...maybe she can help you:

http://www.acstones.com/askbarbara.html

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