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Natural Black Spinel?

Last December 2021, I imposed a question, that is, how can magnetite be distinguished from black spinel.
Since then, I found black pyramid shape stones, attached are pictures of what I have located.
I have scratched tested them with quartzite, topaz and synthetic ruby, of which synthetic ruby did leave an obvious mark.
These were found while walking around in the southwestern US
I don’t have a refractormeter to help distinguish whether or not they are black spinel. Nor do I personally know anyone who has a refractormeter.
Pictures attached of these stones, your insight would be appreciated.


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