What is the example of Conchoidal fracture?
Conchoidal fracture breakage that resembles the concentric ripples of a mussel shell. It often occurs in amorphous or fine-grained minerals such as flint, opal or obsidian, but may also occur in crystalline minerals such as quartz.
What do you mean by Conchoidal fracture give an example?
Conchoidal fracture describes the way that brittle materials break or fracture when they do not follow any natural planes of separation. Other conchoidal features include small fissures emanating from the bulb of percussion.
Why is Conchoidal fracture common in obsidian?
Brittle materials are more likely to exhibit conchoidal fracturing. Several such materials exist in nature, such as jasper, quartz, obsidian, flint and other fine-grained materials. Conchoidal fracture is commonly observed in such materials due to their lack of a crystalline structure or cleavage.
What is the difference between Conchoidal fracture and cleavage?
Background – Cleavage and fracture are both patterns of breakage. Minerals with cleavage break along planar (flat) surfaces of weaker chemical bonds. Conchoidal fracture differs from cleavage because the broken surface is not a smooth, flat plane.
What is mineral conchoidal fracture?
In mineral: Cleavage and fracture. 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.
What is Silver’s fracture?
n. A Colles’ fracture of the wrist causing a silver-fork deformity.
Does coal have conchoidal fracture?
Anthracitic coals are high-rank coals. They are shiny (glassy) and break with a conchoidal (glass-like) fracture. Most coals do not reach anthracitic rank, which requires high heat from very deep burial, tectonic metamorphism, or contact metamorphism with igneous intrusions.
What does the word conchoidal mean?
Definition of conchoidal : having elevations or depressions shaped like the inside surface of a bivalve shell.
What is conchoidal fracture in geology?
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.
Does limestone have conchoidal fracture?
limestone #1 Originally deposited as microscopic aragonite needles, but now converted to calcite and then calcite cemented to form the rock. See Origin Of Micrite for more details. Dense, uniform, fine grained rock with conchoidal fracture.
What is a conchoidal fracture property in a rock?
What are the uses for silver?
It is used for jewellery and silver tableware, where appearance is important. Silver is used to make mirrors, as it is the best reflector of visible light known, although it does tarnish with time. It is also used in dental alloys, solder and brazing alloys, electrical contacts and batteries.