Item M5 is a 12" x 12" x 2"-thick tile that is currently unpolished. The facing side (below) shows a small concave 'cavity' as a unique feature.
The opposite side will also require polishing. The translucent orange-yellow glow of this tile is mostly uniform with a large cell structure type that doesn't overwhelm as a pattern.
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Finished (polished) price for this piece is $150