Any ideas as to what this rock might be?
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paleomaxx
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Based on the perfectly straight line of fracture and the layered look I would say it's likely calcite. You can test it with a small drop of regular vinegar on an edge; if it bubbles then it's calcite (CaCO3) versus gypsum (CaSO4).
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Back-of-the-boat
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Gypsum crystal,dirty crystal quartz are a few it could be.
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huntsman53
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Does it have a greasy feel to it when you rub your' fingers across it? If so, it is quite possible that it is Topaz.
Frank
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niffler
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Calcite has double refraction(?). That is, if you can read writing through it, the image will be doubled.
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