Aphanite is a term used in geology to describe a fine-grained, dense rock that lacks visible crystals. It is a type of igneous rock that forms when magma cools rapidly, preventing the formation of large crystals. In this article, we will explore the definition, meaning, and associations of aphanite.
Definitions
Aphanite is a type of volcanic rock that is characterized by its fine-grained texture. It is formed when lava cools quickly on the surface of the earth, preventing the formation of visible crystals. Aphanite is also known as aphanitic rock or volcanic glass.
Origin
The word aphanite comes from the Greek word “aphanes,” which means “invisible.” This term was first used by the German geologist Ferdinand von Richthofen in the 19th century to describe a type of volcanic rock that lacked visible crystals.
Meaning in different dictionaries
According to the Merriam-Webster dictionary, aphanite is “a fine-grained, dense, usually dark-colored igneous rock that is composed chiefly of feldspar and pyroxene and that is formed by rapid cooling of lava on the surface of the earth.”
The Oxford English Dictionary defines aphanite as “a fine-grained volcanic rock, typically dark in color, with a texture that does not show individual crystals.”
Associations
Aphanite is commonly associated with volcanic activity and is often found in areas where there has been recent volcanic activity. It is also commonly used as a building material, as it is durable and resistant to weathering.
Synonyms
Some synonyms for aphanite include aphanitic rock, volcanic glass, and fine-grained rock.
Antonyms
Antonyms for aphanite include phaneritic rock, which is a type of igneous rock that has visible crystals, and plutonic rock, which is formed deep within the earth’s crust.
The same root words
The root word of aphanite is “aphanes,” which means “invisible” in Greek. Other words that share this root include aphasia (loss of speech) and aphotic (without light).
Example Sentences
- The aphanite rock was so dense that it was difficult to break apart.
- The volcanic glass found in the area was a type of aphanite.
- The building was constructed using aphanitic rock, which proved to be highly durable.
- The geologist identified the rock as aphanite due to its fine-grained texture.
- The aphanite was formed when lava cooled rapidly on the surface of the earth.