Table of Contents
What is a conchoidal fracture property in a rock?
Conchoidal fracture is a smoothly curving fracture surface of fine-grained materials which have no planar surfaces of internal weakness or planes of separation (no cleavage). Such a curving fracture surface is characteristic of glass and other brittle materials with no crystal structure.
Which type of the coal has conchoidal fracture?
Anthracitic coals are high-rank coals. They are shiny (glassy) and break with a conchoidal (glass-like) fracture.
What is Conchoidal fracture in chemistry?
The term conchoidal is used to describe fracture with smooth, curved surfaces that resemble the interior of a seashell; it is commonly observed in quartz and glass. Splintery fracture is breakage into elongated fragments like splinters of wood, while hackly fracture is breakage along jagged surfaces.
What are the two types of conchoidal fractures?
Conchoidal – irregular – irregular fracture producing small, conchoidal fragments. Conchoidal – uneven – uneven fracture producing small, conchoidal fragments.
What are conchoidal lines?
Mindat.org defines conchoidal fracture as follows: “a fracture with smooth, curved surfaces, typically slightly concave, showing concentric undulations resembling the lines of growth of a shell”. So, a conchoidal, or uneven, fracture is not a specific indication of the amorphous character of a mineral, or a material.
What does the word conchoidal mean?
: having elevations or depressions shaped like the inside surface of a bivalve shell.
What causes a Conchoidal fracture?
Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation.
What does the word Conchoidal mean?
What is conchoidal fracture in chemistry?
How is a conchoidal fracture formed?
Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation. Crystalline materials such as quartz also exhibit conchoidal fractures when they lack a cleavage plane and do not break along a plane parallel to their crystalline faces.
What is the meaning of the word conchoidal?
What does conchoidal mean? Here are all the possible meanings and translations of the word conchoidal. Describing a type of irregular fracture that occurs in materials with no natural plane of separation, such as flint. having smooth shell-shaped convex and concave surfaces. having such a fracture.
What does it mean to have a conchoidal fracture?
What Does Conchoidal Fracture Mean? A conchoidal fracture refers to a haphazard mode of breakage of a material that does not adhere to any fixed or well-described physical planes of separation. Brittle materials are more likely to exhibit conchoidal fracturing.
How big is a conchoidal fracture in chert?
However, the fracture surface is not as smooth and shiny because microscopically it is pretty rough. Width of the sample is 12 cm. Chert is another rock type that commonly exhibits a conchoidal fracture. It was also widely used as a tool-making material by our ancestors. Width of sample from Cyprus 7 cm.
How does a conchoidal fracture of obsidian work?
Conchoidal fracture. If the force is applied correctly, a flake of obsidian is peeled away leaving obsidian with a smoothly curving fracture surface and sharp edges. It was the way our ancestors made sharp cutting tools.