IPA: /ˈfloʊstoʊn/
KK: /ˈfloʊstoʊn/
A type of mineral deposit made of calcium carbonate that forms in layers where water has flowed or dripped, often found on cave walls or floors.
The cave was adorned with beautiful flowstone formations that sparkled in the light.
Flowstone is formed from "flow" (from Old English "flowan", meaning to flow) and "stone" (from Old English "stan", meaning rock or stone). The word describes a type of mineral deposit that forms as water flows over a surface, creating a stone-like appearance.
Think of water 'flowing' ('flow') over a surface and leaving behind a 'stone' ('stone') deposit — that's how flowstone is formed.