Flagstone is the term given to almost all stone materials cut into thin, irregular shapes found frequently on sidewalks, foyer entrances, pool decks, etc. Flagstone tile is commonly sandstone-type. Flagstone should not be ground, and should only be cleaned and sealed.
Pros: Durable. Stain-resistant. Many options for sealer from no gloss to high-shiny gloss.
Cons: Hard on legs and feet. Cold in winter.
Cleaning tips: Damp mop using clear water, or an all purpose floor cleaner. Wring out the mop until it does not drip.