Martianware Pottery Clay

SKU: MARS-5 Brand: Seattle Pottery Supply    


MARS-5 5 Pound 20 in stock Order Now!$19.00
MARS-25 25 Pound 15 in stock Order Now!$25.00

*Back orders will be placed for order quantities exceeding that of on-hand inventory.

Martianware Pottery Clay is a clay body deliberately mixed to mimic the chemical composition of the surface of Mars. Utilizing data from NASA, scientific research, and synthetic Martian soils, Seattle Pottery Supply reverse-engineered a clay body that, to the best of our ability, has the same structural composition of the native clay that would be found on the surface of Mars, if only the planet had enough water.

Firing Range ∆06 - ∆04
This clay will self-glaze and turn a variegated brown when fired at ∆04, and will start to bubble and bloat when fired at ∆03 or higher.

Martianware Pottery Clay is similar to the extraterrestrial soil in both its macro (SiO2, Al2O3, MgO, Na2O, etc.) and minor (Cr2O3,Ni2O, MnO) chemistry composition, as the clay contains minerals (like Olivine) which are abundantly found on the Red Planet.

The formula for Martianware Pottery Clay was obtained through a pull of data points which, when composited together, reflect the average combination of Martian soils. Unable to source all the raw matter from minerals found on Mars (at least for now) Seattle Pottery Supply speculated what Martian clay would be like, but more importantly: what could one sculpt?

What will YOU sculpt?

USPS Priority Domestic Shipping
5lb blocks - FREE SHIPPING
25lbs (1x 25 lb block) $15 shipping
50lbs (2x 25lb blocks) $20 shipping

USPS Priority International - Canada
Up to 20lbs, $55 shipping

What’s special about Martianware?

Martianware stores chemicals not typically found in wet clay. At Seattle Pottery Supply, we were unaware of how this would affect the clay body and whether or not it would survive a kiln firing. Due to the abundance of soluble salts in the chemistry of Martianware, we realized that when fired, precipitated salts on the surface form a glassy crust. It is what we are calling “self-glazing clay.”

Celestial sources replicated from Earth

The creation of Martianware ushers in a new era in the mixing of clay, and its uses remain to be discovered by pioneering sculptors. With glaze technology and kiln manufacturing, commercial pottery focuses on manipulating glazes in ways that our ancestors were simply not able to do. We see this reflected in the deliberate creation of crawling glazes, colorant stains, crystal glazes, controlled reductions, and other technical applications. In this sense, we use the rich diversity of materials that Earth offers, and now that of our neighboring planet, to create clays that do incredible things we never thought clay could do.


Designed with versatile applications in mind; we encourage handbuilding, throwing, tile making and sculpting with Martianware. Our staff has thus far only tried limited applications since its conception, and we remain intrigued by the myriad approaches that this new clay body will inspire.


Due to the abundance of soluble salts in its chemistry, when drying, salts precipitate to the surface and form a glassy crust once fired. It is what we are calling “self-glazing clay.” Because of the soluble salts in Martianware, traditional glazes may react unpredictably. We haven’t succeeded in effectively glazing vessels for functional ware where one can drink, consume beverage or food. Therefore, we recommend test tile experimentation!


We recommend firing on a light dusting of alumina hydrate or kiln wadding underneath the clay body, because Martianware is a “self-glazing”, this will help prevent any possibility of plucking (sticking to kiln shelves).

Image Caption: Side by side of Greenware Vase with visible soluble salts on the lip (left) and Cone 05 (right) fired vase (9.5 in tall x 7 in wide)

Here's more information about Martianware and an interview with its creators.

Read All About It