Chert is a sedimentary rock consisting almost entirely of silica (SiO 2 ), and can form in a variety of ways. read more
Audubon classifies it as a sedimentary rock. If it’s black, it’s flint. read more
Abiotic is non-living, chemicals and physical factors like light, water, air etc. read more
The term “flint” is essentially synonymous with chert, but its usage is more restricted, at least in geology where “chert” is preferred. Flint is a dark variety of chert for some geologists (especially when it occurs as a nodule in chalk) and semivitreous chert has been named that way. read more