quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires.in the wildhttps://news.ycombinator.com/item?id=40824209randomretrieved2024-06-28tagsChert (Wikipedia)Quartz (Wikipedia)Wikipediawebsitehttps://en.m.wikipedia.org/wiki/Flintwikipedia offlint