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It probably depends on which format you are using.
If you are converting from epub to AZW3, yes you should be able to format your <hr> to be thicker (I have used as much as 8 pt.)
But if you are converting to OLD Mobi, I think that will not honor any such styling. Anyway, when I ran a test conversion, my fat 6-pt <hr> turned out very anorexic, looking only like 1 pixel.
You might try putting a second <hr> underneath the first so you have a very widely-spaced double line. Otherwise, for old Mobi, as Tomsem suggests, an image might be your best option.
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