In graphene and similar materials, Dirac cones determine many of the unusual electronic properties.

After the heavy rain, the hikers carefully stepped around the fragile mud cones along the riverbank.

The geologist carefully measured the growth rate of the mud cone after last night's tremors.

The kids ran to the stand to buy colorful snow cones on a hot summer afternoon.

The children collected fir-cones along the snowy trail.

She carefully placed the fragile fir-cone into her pocket as a keepsake.

The city crew lined up traffic cones along the wet road to redirect drivers.

She placed a cone flower in a small vase on the windowsill, where its bright petals cheered the room.

The cone flowers along the roadside attracted butterflies and hummingbirds.

The garden looked brighter when a single orange cone-flower caught the late afternoon sun.