it is the atoms metal.
Obsidian. It commonly is dark because of the Fe contamination.
This unique arclike pattern that forms when flint and opals break is called a concoidal fracture. It is characterized by smooth, curved surfaces with concentric ridges radiating from the point of impact, resembling the shape of an arc or horseshoe. This fracture pattern is distinct and useful in identifying these minerals.
Cleavage is a property of minerals. Sandstone is a rock type. As such it doesn't have the property of cleavage.Cleavage is a metamorphic fabric. Sandstone is not a metamorphic rock and thus can not display a cleavage.
They are identical (hardness, streak, ect) barring the chemical composition however plagioclase has striations on the cleavage surface.
a fracture in which skin is intact at site of fracture is a closed fracture or simple fracture whereas compound fracture or an open fracture is a fracture in which the skin is perforated and there is an open wound down to the site of the fracture.
A broken bone is often called a "fracture" or "bone fracture". Some examples from the Wikipedia entry on bone fracture. * Complete Fracture- A fracture in which bone fragments separate completely. * Incomplete Fracture- A fracture in which the bone fragments are still partially joined. * Linear Fracture- A fracture that is parallel to the bone's long axis. * Transverse Fracture- A fracture that is at a right angle to the bone's long axis. * Oblique Fracture- A fracture that is diagonal to a bone's long axis. * Compression Fracture-A fracture that usually occurs in the vertebrae. * Spiral Fracture- A fracture where at least one part of the bone has been twisted. * Comminuted Fracture- A fracture causing many fragments. * Compacted Fracture- A fracture caused when bone fragments are driven into each other * Open Fracture- A fracture when the bone reaches the skin * Bug fracture- A fracture when the bone is in place, but the fracture has the appearance of a crushed insect.
Open....It's called an OPEN FRACTURE.
Open Fracture formerly known as a compound fracture.
When a fracture is associated with a laceration or cut in the area of the fracture, it is called an open fracture
A compound fracture, the worst kind.
A compound fracture is when a bone protrudes through the skin.
An avulsion fracture is when you pull a ligament or tendon from a bone and a piece of that bone comes with it. It is not actually a "fracture". A fracture is a break.