The sediment has been ground by tectonic plates scraping against each other. It's very fine-grained and after it's applied to the clay it dries and contracts and peels up like a dried riverbed cracks but then, in the kiln, it melts and relaxes back down. More about the material here.
Pink and Green Flashing ~ Costa Rican Sediment
Gritty Bumps, Wrinkles and Clear Colors
Converging and Diverging Plate Boundaries on Porcelain
Costa Rican Accretionary Prism on Porcelain
Costa Rican Cup
Costa Rican Subduction Cup
"Subduction Forces" Cup on Porcelain
Costa Rica and Copper Red/Green on Porcelain
Folding Fracturing Fissuring on porcelain
9.5" x 1.25"
Exterior's sheer silica-rich pumice mud from Havre Submarine eruption of 2012 is in contrast with front's two samples. Chatter pattern is glazed with earth crust slurry from Mid-Atlantic Ridge at Kane Fracture Zone. Fine grained brown sediment between word band and rim is from an area described to me as the Costs Rican accretionary prism. "Geo-presence" is a word I wrote to rivet myself down in to the uninterpreted evidence of it all. Materials melted on clay.
11" wide x 4" high
Not literally, but figuratively speaking this piece is covered with Earth crust slurry from Mid-Atlantic Ridge which, on porcelain, can be a bit sheer where thin and as it's thicker it's more metallic looking. A groove of clear sea-glass fractured and glistens in contrast to the other glazes. The center is "All".
5" x 2.5"
On porcelain clay, a good example of how the Costa Rican Accretionary Prism sediment looks when applied thinly and thickly. Center of seaglass. Rim and foot glazes assembled from refined materials.
4" x 2"
On porcelain, click for larger image to read words. Brown glaze is from the Costa Rican Accretionary Prism. Center of seaglass, rim and foot assembled from refined materials.
8" x 4"
On porcelain. Costa Rican sediment contracted and curled before it melted, in contrast to smooth, semi-sheer Earth crust. Seaglass center. Click multiple times to see back and side views and read words.
5.5" x 3"
On porcelain clay, "Subducting friction forcing divergence at Mid-Atlantic Ridge". Interior from Costa Rican accretionary prism and exterior of rock slurry from Kane Fracture Zone, applied to a surface that had been chattered when the bowl was leather-hard. Rim and foot of glazes assembled from refined materials.
14.25" wide x 2.5" high
Plates Spread & Collide While Gulf of Mexico Evolves.
Words written on back say, "Center of sea glass contains volcanic sand from Antarctica, Iceland and Hawaii is framed by Earth crust drillings (SPREADING) from mid-Atlantic Ridge framed by accretionary prism (COLLIDING) sediment. Tectonic plates."
Back around foot says, "sediment glazes from Gulf of Mexico 1998 and 2009 . . . "
Rim and foot are glaze assembled from refined materials. Lugs are placed so piece can hang on a wall. $1275.00
The firing amplified the land's dynamics by causing the melting matte white glaze to flow and carry the Earth crust slurry with it, resulting in an image of a ridge growing out of spreading plates. It captures the process of magma pushing up and forcing the two plates to diverge.
The back has a continuous band of writing, including what came to me with the material.
See more about the material used, known among geologists as the Kane Fracture Zone, here
the Mid-Atlantic Ridge.
7.5" x 2.25"
On porcelain clay, seaglass center surrounded by Mid-Atlantic Ridge and Havre volcano pumice/mud. Rim and foot of glazes assembled from refined materials.
A clay slab with inner rectangle dipped into rock slurry from Mid-Atlantic Ridge (area called Kane Fracture Zone) and hung by stainless steel cable wrapped around stones from the rift valley in Iceland -- playing with continuity of that long ridge that keeps spreading. Frame is glazed with ladles from 6 buckets from location extremes of north, south, east and west plus high-carbonate and high-silica samples.
Writing includes a description about the Kane Fracture Zone material.
4" wide x 3" high
Very translucent porcelain got a big blob of soupy Earth crust slurry poured into the center. Some gassy event got frozen into the cooled bowl -- blistered and split showing tension between the refined porcelain particles and the unrefined rock slurry. Same slurry applied thinly on the exterior of the bowl fired smoothly.
Band of asteroid-laden sediment is on the inside and outside -- in a narrow band underwhich words are written.
11" x 11".
Across continents, across time zones, the world upside-down, two cohorts find each other and co-create; His form, Her glazes. No! Earth's glazes -- Gaia's glazes. Just the evidence of materials changed in a kiln. Thanks to Brian Gartside!
5/25" x 2.5"
Says, "Costa Rican accretionary prism subducting, folding, fracturing, fissuring". Rim glaze assembled from refined materials. Center of sea-glass.
6" x 2"
With coordinates. Rock slurry is thin and transparent on the back, applied more thickly on the interior chatter-patterned area. Glazes assembled from refined materials are celadon and copper green (Oribe).
10.5" x 3"
Same materials on front and back look different because of application thickness. Center spiral is "All" glaze that pooled and melted in the grooves and slid off the high places; it's the only sediment I use that is a mixture from many places: Mediterranean and Bering Seas, Atlantic, Pacific and Indian Oceans.
Brown is the Mid-Atlantic Ridge rock slurry. Crackled groove that frames the spiral is blue sea-glass. Click on the back image for a larger view, if you'd like to read the words.
Rim and foot are glazes assembled from refined materials.
6" x 2.25"
On porcelain, Earth crust slurry is brown glaze on the back. Interior is a copper red glaze assembled from refined materials. Copper volatilizes during firing and the areas of green and red show the air circulation that carried that copper through the kiln's chamber at high temperature.
4.25" x 3"
Top exterior is Earth crust slurry from Mid-Atlantic Ridge and bottom half is from Costa Rican subduction zone. Interior shiny whitish glaze assembled from refined materials.
8.75" x 2" x 2"
With diverging, somewhere there's converging -- what happened at the subduction area from which this brown sediment glaze came. Other glaze assembled from refined materials.
12" x 1.75"
Center of sea-glass is surrounded by an area of chattered porcelain clay that was glazed with rock slurry from the Kane Fracture Zone, and area of the Mid-Atlantic Ridge. outside of that is fine-grained sediment from the Costa Rican accretionary prism, an area of subducting plates under immense pressure from friction.
13" x 2"
"Converging diverging . . . spreading ridge here. Fissuring folding friction subducting there. Tectonics. Central creatures framed by chattered area of Mid-Atlantic Ridge rock slurry (diverging plates) framed by a band from Costa Rican accretionary prism (converging plates). Copper green and matte white and lavender glazes assembled from refined materials.
4.5" wide x 2.75" high
Exterior chatter pattern is the Mid-Atlantic Ridge rock slurry also known as the Kane Fracture Zone. It also surrounds the sea-glass center. The speckled brown sediment glaze is from a subduction zone some people call the Costa Rican accretionary prism.
6.25" x 2"
Says, "Earth's Mid-Atlantic preading ridge. Havre volcano's pumice mud, subduction friction forces." Chattered area is M.A.R. rock slurry. Area outside the word-band is subduction sediment from Costa Rican area and back silica glaze is from havre's submarine volcano.
Shiny brown and copper green were assembled from refined materials.
5.5" x 1.25"
The words describe dynamics at three sources of interior glaze. From center outward: Havre pumice-mud (erupting), Kane Fracture Zone (remagmatizing) and Costa Rican accrectionary prism (subducting). Click on back image to read the words.