aphanite

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    Aphanites (adj. aphanitic; from Ancient Greek αφανης (aphanḗs) 'invisible') are igneous rocks that are so fine-grained that their component mineral crystals are not visible to the naked eye (in contrast to phanerites, in which the crystals are visible to the unaided eye). This geological texture results from rapid cooling in volcanic or hypabyssal (shallow subsurface) environments. As a rule, the texture of these rocks is not the same as that of volcanic glass (e.g., obsidian), with volcanic glass being non-crystalline (amorphous), and having a glass-like appearance.
    Aphanites are commonly porphyritic, having large crystals embedded in the fine groundmass, or matrix. The larger inclusions are called phenocrysts. They consist essentially of very small crystals of minerals such as plagioclase feldspar, with hornblende or augite, and may contain also biotite, quartz, and orthoclase.


    Common rocks that can be aphanitic


    Andesite
    Basalt
    Basanite
    Dacite
    Felsite
    Phonolite
    Rhyolite
    Trachyte


    References

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aphanite

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Aphanite - Wikipedia

Aphanites (adj. aphanitic; from Ancient Greek αφανης (aphanḗs) 'invisible') are igneous rocks that are so fine-grained that their component mineral crystals are not visible to the naked eye [2] (in contrast to phanerites, in which the crystals are visible to the unaided eye).

What Is an Aphanitic Texture, and Which Rocks Have It?

Sep 6, 2022 · Aphanitic texture describes igneous rocks with small or fine mineral crystals you cannot see or distinguish by the naked eye or a hand lens. Such rocks are fine-grained and need a petrographic microscope to see or identify individual mineral crystals. Rocks with this texture are known as aphanites.

Aphanite Definition & Meaning - Merriam-Webster

The meaning of APHANITE is a dark rock of such close texture that its separate grains are invisible to the naked eye.

Phaneritic and Aphanitic Textures: Comprehensive Comparison

Phaneritic and aphanitic are two main types of igneous rock textures. They are distinguished by the size of the mineral grains in the rock. Phaneritic Vs. Aphanitic. Coarse Grained Texture (Phaneritic), Mineral Grains Easily Visible (Grains Several Mm in Size or Larger)

APHANITE definition and meaning | Collins English Dictionary

APHANITE definition: any fine-grained rock, such as a basalt , containing minerals that cannot be... | Meaning, pronunciation, translations and examples

What does aphanite mean? - Definitions.net

Aphanite is a type of volcanic rock characterized by its fine-grained texture and glassy surface. The rock is so fine-grained that most of its mineral constituents are not visible to the naked eye. The term is derived from the Greek word 'aphanes', meaning 'invisible'.

Difference between aphanitic and phaneritic

The word aphanitic, which is used as an adjective to describe aphanites, is a term that is used for certain forms of igneous rocks that are very fine grained. Indeed, they are so fine that their components (mineral crystals) cannot be detected by the human eye as long as some magnifying instrument has not been used.

Aphanitic vs. Phaneritic — What’s the Difference?

Mar 21, 2024 · Aphanitic rocks have fine-grained textures not visible to the naked eye, typical of fast-cooling lava. Phaneritic rocks are coarse-grained, with minerals visible to the naked eye, indicating slow cooling within the Earth.

Aphanite

Aphanite by Marlin Feb 24, 2023 These fine-grained rocks are so compact that the naked eye cannot see their individual mineral crystals, unlike their larger and more showy phaneritic counterparts.

Aphanite: Mineral information, data and localities. - mindat.org

Any fine-grained igneous rock whose components are not distinguishable with the unaided eye; a rock having aphanitic texture.