pisolite
Definition
Noun (Geology/Mineralogy): - A sedimentary rock composed of pea-sized spherical concretions: "pisolite" refers to a type of rock formed by the accumulation of small, rounded calcareous grains called pisoids, typically 2–10 mm in diameter, often found in limestone or cave deposits.
Usage Examples
- (A rock made of small, pea-like mineral grains.)
- (The rock type was recognized by its rounded grain structure.)
Advanced Usage
"Pisolite fabric": a textural term describing the arrangement of pisoids within the rock.
- The pisolite fabric in this sample shows well-sorted, concentric layers. (The internal structure of the rock displays orderly, layered pisoids.)
"Pisolite facies": a specific geological environment where pisolite forms, such as in hot springs or lagoons.
- The pisolite facies indicates a shallow, agitated water environment. (The rock type points to a specific depositional setting.)
Variants and Related Words
Pisoid (n): the individual spherical grain that makes up pisolite.
- Each pisoid in the pisolite is about 5 mm in diameter. (The small, rounded particles are the building blocks of the rock.)
Pisolitic (adj): having the texture or composition of pisolite.
- The pisolitic limestone is easily broken along the grain boundaries. (The rock exhibits the characteristic pea-like structure.)
Synonyms
- Pea stone: a colloquial term for pisolite due to its pea-sized grains.
- Oolite (distinct but related): a similar rock composed of smaller, egg-shaped grains (ooliths), often confused with pisolite.
Related Idioms
- "As round as a pisolite": a rare simile used to describe something perfectly spherical.
- The pebbles on the beach were as round as a pisolite. (The stones were very smooth and spherical.)
Notes
- Pisolite differs from oolite in grain size: pisoids are typically larger than 2 mm, while ooliths are smaller. The term is derived from the Greek "pison" (pea) and "lithos" (stone).