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 5" x 3.5"
Melted Earth crust slurry is glaze on the exterior bottom third. It was applied to leather hard clay and words were written into the clay at that time. It's from the Kane Fracture Zone at 2. 23.5° North and 45° West.
Celadon over a shiny white glaze on interior. itself.
Thumbwell is filled with sea glass.

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 6" x 3.5"
Earth crust slurry melted,is exterior glaze. Tenmoku is the shiny brown interior and top third.
No words written on the mug about the materials, but comes with information about the Kane Fracture Zone on the mid-Atlantic Ridge, from where the slurry/glaze came.

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 3.75" x 3.5"
A dip into rock slurry at the right time enables writing to carve away material without crumbling or digging to deeply. Interior glaze assembled from refined materials.

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 3.5" x 3.5"
Says, "Drillings into Earth's spreading ridge: cut, melted, HERE". Interior glaze assembled from refined materials.

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 3.5" x 3.25"
The settling rock powder suspended in water made the dip of this cup appear with varied thicknesses deposited onto it. Looking at it might might reveal to you where it's thin and thick.
Interior glaze assembled from refined materials.

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