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Does anybody know what kind of crystal this could be?

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My husband does pole inspection work and his job is to dig around and treat power and telephone poles. He found this while he was working near a highway. It doesn't fog up, it scratches glass and is reflective. If you hold it in the light in the right position, you can see a tiny spot on it that gives rainbow colors. I took it to a jeweler and all she did was hold it in her hand and looked at it and just said it was a crystal but she didnt tell me what kind. She didn't do any tests on it. What do you think it is?