Crystal for altar?

So I had a dream the other night about something completely unrelated to witchcraft, but in the background I saw my altar. It was similar but had a lot more on it. It had a large pointed crystal between the candles and I have the vague impression it was acting as a sort of energy cleanser or beacon. Idk if that’s a thing, but I’m wondering what kind of crystal I would use for something like that? Just quartz? I remember someone mentioning a different crystal that was supposed to have high Spiritual vibrations, any idea what it might have been?

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