Fine-grained silica, 5 letters
Flint-like rock, 5 letters
Flintlock rock, 5 letters
Quartz, 5 letters
Rock found in limestone beds, 5 letters
Rock like flint, 5 letters
Rock made mainly of silica, 5 letters
Variety of silica containing microcrystalline quartz, 5 letters
Rock actor?, 12 letters
Containing a flintlike rock, 6 letters
Like some hard soils, 6 letters