Cased blue blizzard mica with light ridges.
Extremely rare marble in shooter size. The ridges are clear to see in hand where all the mica is pushed into a thin line which spirals the marble, there is one on each side, clearly done by the maker before the thin layer of clear glass was added. Not only does it have the ridged affect but it’s covered in mica and has an oxblood core plus is in very nice condition. First 2 pictures show the marble underwater. Marble has 4 what look like as made pits/pops, 3 are in a triangle towards the top pontil which are shown in the last 2 pictures and one near the faceted pontil. I believe all 4 to be as made, the rest of the glass looks very clear.

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M-/nm+