conchoidal

/kong-koid-l/US // kɒŋˈkɔɪd l //UK // (kɒŋˈkɔɪdəl) //

螺帽状,螺线型,螺帽形,圆锥形

Definitions

adj.形容词 adjective

1
Mineralogy.
- : noting a shell-like fracture form produced on certain minerals by a blow.

Very compact and fine-grained reddish granular quartz, with a glistening lustre, and flat conchoidal fracture.
I am told conchoidal white lime-stone meets it on both the east and west sides.
In the form of translucent fragments, with a highly conchoidal fracture, among the debris of the shores of Lake Pepin.
At ordinary temperatures ebonite is hard and brittle and breaks with a well-marked conchoidal fracture.
The fracture of this fossil is perfectly conchoidal, sometimes glossy, and sometimes dull on the surface.