Definition of pipe

i. A cylindrical, more or less vertical orebody.

Synonym of: chimney, ore pipe, shoot, stock

Ref: AGI

ii. A vertical conduit through the Earth's crust; e.g., a kimberlite pipe of South Africa, through which magmatic materials have passed. It is usually filled with volcanic breccia and fragments of older rock. As a zone of high permeability, it is commonly mineralized.

Ref: AGI

iii. A tubular cavity from several centimeters to a few meters in depth, formed esp. in calcareous rocks, and often filled with sand and gravel; e.g., a vertical joint or sinkhole in chalk, enlarged by solution of the carbonate material and filled with clastic material.

See Also: piping

Ref: AGI

iv. The name given to the fossil trunks of trees found in coalbeds.

Ref: Fay