Don't know if this would qualify as a folded. I have heard this type described as a "fingernail" pontil (lower left). Although I do not believe it is a true pontil. Hope this helps.
thanks.
I believe you have "precision banded" Indian and a very nice one at that size. The separation of glass (black lines in the colored panels) is not that uncommon in this type of marble.
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It is opaque. I have seen them range in color from red to dark burgandy with white or yellow swirls. All of the ones I have seen were in the 3/4" range in size.
thanks.