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Webster 1828 Edition

Floatstone

FLO'ATSTONE

,
Noun.
Swimming flint, spungiform quartz, a mineral of a spungy texture, of a whitish gray color, often with a tinge of yellow. It frequently contains a nucleus of common flint.

Definition 2024

floatstone

floatstone

English

Noun

floatstone ‎(countable and uncountable, plural floatstones)

  1. A kind of calcareous rock, more than 10% of which is made up of grains larger than two millimetres, and which is matrix-supported.

Etymology

float +‎ stone

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