chert

Adjective modifier

• black: The upper beds of the third limestone are often dark colored, and contain layers of black chert in nodules.
• gray: The pieces of gray chert were found on the tourist path below slopes too steep for human habitation.
• opaline: Figure 5. The aging process of Casa Montero's cherts: X-Ray diffraction pattern of opal and opaline chert obtained from the same nodule.
• white: In fewer instances, layers of the limestone seem to be converted into white chert, called china stone.

Modifies a noun

• nodule: A perfect solution tube can be seen in the roof and large chert nodules abound.
• grit: GW3 Thick walled, numerous small to medium chert grits, some small cavities, quartz dust in the clay matrix.
• fragment: Grits comprise medium and large angular chert fragments, with a few very small to large cavities from former grits.
• cobbles: Below, there is an accumulation of chert cobbles belonging to the terrace deposits.
• pebble: Not all the material is rounded, the flint and chert pebbles becoming more angular with depth ( Carr and Blackley 1969 ).
• flake: A single chert flake was visible at the surface of the feature.

Noun used with modifier

• radiolarian: However, in comparison to Group 4, radiolarian chert is virtually absent.