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I found a dart point today and was wondering if it is opal?

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Specific gravity of Opal is right at 2.15, Quartz and Chalcedony around 2.7, so if your test is accurate it could very well be Opal, now you can try and do a hardness test but Opal and Quartz are only 1 digit from each other as hardness goes, Opal is 5.5 to 6, Quartz is 7, Chalcedony is 6.5 to 7, streak color won't help as both Opal and Quartz should streak white.

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