Obsidian Lava Black

Obsidian

Obsidian is a naturally occurring volcanic glass formed when lava extruded from a volcano cools rapidly with minimal crystal growth. It is an igneous rock. Produced from felsic lava, obsidian is rich in the lighter elements such as silicon, oxygen, aluminium, sodium, and potassium. It is commonly found within the margins of rhyolitic lava flows known as obsidian flows. These flows have a high content of silica, giving them a high viscosity. The high viscosity inhibits the diffusion of atoms through the lava, which inhibits the first step (nucleation) in the formation of mineral crystals. Together with rapid cooling, this results in a natural glass forming from the lava.

Lava

Lava is magma that has been expelled from the interior of a terrestrial planet or a moon onto its surface. Lava may be erupted at a volcano or through a fracture in the crust, on land or underwater, usually at temperatures from 800 to 1,200 °C. Lava may be erupted directly onto the land surface or onto the sea floor or it may be ejected into the atmosphere before falling back down. The solid volcanic rock resulting from subsequent cooling of the molten material is often also called lava.

Black

Black is a color that results from the absence or complete absorption of visible light. It is an achromatic color, without chroma, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white have often been used to describe opposites such as good and evil, the Dark Ages versus the Age of Enlightenment, and night versus day. Since the Middle Ages, black has been the symbolic color of solemnity and authority, and for this reason it is still commonly worn by judges and magistrates.

Lava (color)

Lava is a color that is a purplish shade of red. It is named after the color of volcanic lava.

obsidian

Noun

1. A type of naturally occurring black glass produced by volcanoes.
2. A slightly bluish black, the color of obsidian glass.

Adjective

1. Black.

lava

Noun

1. The molten rock ejected by a volcano from a vent such as a crater or fissure; magma that has breached the surface of the earth.
2. A body of lava.

black

Adjective

1. Absorbing all light and reflecting none; dark and hueless.
2. Without light.

Noun

1. The colour/color perceived in the absence of light, but also when no light is reflected, but rather absorbed.
2. A black dye or pigment.