Definition

Noun A fine-grained, homogeneous igneous rock in which the constituent minerals are too small to be distinguished by the unaided eye. It forms from the rapid cooling of lava at or near the Earth's surface.

Usage

The term "aphanite" is a technical geological term used to classify and describe the texture of certain igneous rocks. It is primarily used in scientific writing, academic geology, and professional mineralogy.

Examples

• The geologist identified the dark, dense sample as an aphanite due to its uniform, fine-grained texture.
• Basalt is a common example of an aphanite.
• Under the microscope, the minerals within the aphanite became clearly visible.

Advanced Usage

• Aphanitic Texture: This is the more common term used to describe the rock's characteristic texture. "Aphanite" is the rock itself, while "aphanitic" is the adjective describing its texture.
  • Example: The lava flow cooled quickly, resulting in an aphanitic texture.

Variants and Related Words

• Aphanitic (adjective): Describing the fine-grained texture of an aphanite.
  • Example: The sample exhibited a typical aphanitic texture.
• Phanerite (noun): The antonym; an igneous rock with crystals large enough to be seen with the naked eye (e.g., granite).

Synonyms

• Fine-grained rock
• Dense igneous rock

Different Meanings

The word "aphanite" has a single, specific meaning in geology and does not have other common definitions or usages in general English.

Noun

1. fine-grained homogeneous rock (such as basalt) containing minerals undetectable by the naked eye