What does the word conchoidal mean?

Definition of conchoidal : having elevations or depressions shaped like the inside surface of a bivalve shell.

What is an example of conchoidal?

Examples of Conchoidal Fracture Note curved surfaces that are concave into the shell. Manmade glass, knapped.

What does conchoidal mean in geology?

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 animal is the term conchoidal derived from?

Conchoidal fractures often result in a curved breakage surface that resembles the rippling, gradual curves of a mussel shell; the word “conchoid” is derived from the word for this animal (Ancient Greek: κογχοειδής konchoeidēs < κόγχη konchē). A swelling appears at the point of impact called the bulb of percussion.

What is a cleavage rock?

Cleavage is a type of rock layering or planar formation that forms within finely grained rocks due to deformation and metamorphism caused by heat and pressure. Specifically, cleavage is a type of foliation which is how geologists refer to certain types of deformed repeating layers that form within a metamorphic rock.

Is splintery a word?

adjective Consisting of splinters; resembling splinters.

Are glass fractures conchoidal?

First of all, glass does not have crystal planes, so any time you hit it, it will break in an irregular pattern that sort of looks like circular fractures. We call this “conchoidal fracture”.

What materials typically show a conchoidal fracture?

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 sedimentary rock has a conchoidal fracture?

Chert is a sedimentary rock composed of microcrystalline or cryptocrystalline quartz, the mineral form of silicon dioxide (SiO2). It occurs as nodules, concretionary masses, and as layered deposits. Chert breaks with a conchoidal fracture, often producing very sharp edges.

What rock has a conchoidal fracture?

Obsidian is famous for its conchoidal fracture surface. This rock type was highly valued during the Stone Age because it makes a fine cutting blade if treated (fractured by precise and forceful blows) correctly.

What are cracks in rocks called?

One of the common traits of rocks is that they crack when subjected to physical stress, and this trait is called cleavage.

What is the only mineral that can scratch a diamond?

As you can see, diamond is a 10 on the Mohs Hardness Scale. Diamond is the hardest mineral; no other mineral can scratch a diamond. Quartz is a 7. It can be scratched by topaz, corundum, and diamond.