gunnison basalt


stone image | specifications | finishes | applications | projects
Gunnison Basalt is an excellent choice for interior and exterior applications. It is a durable, hard stone which is resistant to freeze-thaw cycles. Its medium dark gray color and small markings are relatively consistent. Architects specify this natural basalt for interior flooring, exterior paving stone, stair treads, fireplace surrounds and stone wall cladding. Gunnison Basalt is available in honed, cascade and polished finishes.

stone type



Medium dark gray. Relatively consistent in shade. Small, natural markings occur.

weathering characteristic

Gunnison will hold its basic color even after many years of exterior use.


Hard, durable, resistant to freeze-thaw cycles. Naturally occurring, small holes are visible. These holes can be filled for interior applications. No detrimental effects on the environment.


interior, exterior


Depending on the application, an impregnating sealer may be required. Clean with a neutral stone soap - never with chemicals. Contact us for information regarding the use of sealers, impregnators, oiling, cleaning, etc.


upon request

ASTM results

upon request


stone image | specifications | finishes | applications | projects

Finishes Descriptions

Honed - an extremely smooth, eggshell finish. Achieved with the use of fine diamonds. Small holes in the face are visible.

Cascade - a uniform finish with subtle ripples and soft texture. Small holes in the face are visible.

Sandblasted - muted appearance in a flat, gritty finish.

Polished - more shiny and reflective than honed. Small holes in the face are visible.