right|thumb|A piece of flint long, weighing 171 grams
I appreciate your request, but the context provided only shows a caption describing a physical specimen of flint (its size and weight) without explaining what flint actually is or why it matters. I don't have enough information to write an accurate 2-sentence overview based solely on this context, as you've requested.
AI-generated from the Wikipedia summary — may contain errors.
via Wikipedia infobox
right|thumb|A piece of flint long, weighing 171 grams
Flint, occasionally flintstone (SiO2 ), is a sedimentary cryptocrystalline form of the mineral 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.
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).