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Aphanite, or aphanitic as an adjective (from the Greek αφανης, "invisible"), is a name given to certain igneous rocks that are so fine-grained that their component mineral crystals are not detectable by the unaided eye (as opposed to phaneritic igneous rocks, where the minerals 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 quite the same as that of volcanic glass (e.g., obsidian), with volcanic glass being non-crystalline (amorphous), and having a glass-like appearance.

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  • Aphanite
  • Aphanitisch
  • Aphanite
  • Afanitisch
  • Afanítica
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  • L'aphanite est une roche magmatique dont la structure est à grain très fin. Les cristaux qui la composent sont si petits qu'ils ne peuvent être observés à l'œil nu. L'aphanite était utilisée par les artisans du Néolithique pour fabriquer des haches et autres outils.
  • Aphanitisch (griech. ἀ-, ἀν a-, an- = un-, nicht- und φανερός phanerós = sichtbar, offenbar) nennt man das Gefüge eines Gesteins, dessen Einzelbestandteile so feinkörnig sind, dass sie mit dem bloßen Auge nicht voneinander zu unterscheiden sind.
  • Afanitisch (van Grieks: ἀ-, ἀν ("niet"), φανερός ("Zichtbaar"); Engels: aphanitic) is in de petrologie de naam voor een textuur bij stollingsgesteentes, die geheel of grotendeels bestaan uit kristallen die te klein zijn om te onderscheiden. Afanitische gesteenten (soms afanieten genoemd) zijn kristallijne stoffen, maar de kristalijne textuur blijkt pas onder een microscoop. Het tegenovergestelde van afanitisch is faneritisch, een textuur van kristallen die groot genoeg zijn om met het blote oog te onderscheiden.
  • Afanítica é a designação dada à textura que pode ser encontrada em rochas ígneas e que consiste numa massa constituída por cristais de pequena dimensão e sem forma definida, que testemunham que a rocha em questão arrefeceu rapidamente, não permitindo que os cristais atingissem maior dimensão nem uma forma regular. Por vezes, no seio dessa massa, existem cristais de grandes dimensões, denominando-se então a textura da rocha em questão por textura porfirítica.
  • Aphanite, or aphanitic as an adjective (from the Greek αφανης, "invisible"), is a name given to certain igneous rocks that are so fine-grained that their component mineral crystals are not detectable by the unaided eye (as opposed to phaneritic igneous rocks, where the minerals 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 quite the same as that of volcanic glass (e.g., obsidian), with volcanic glass being non-crystalline (amorphous), and having a glass-like appearance.
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  • Aphanite, or aphanitic as an adjective (from the Greek αφανης, "invisible"), is a name given to certain igneous rocks that are so fine-grained that their component mineral crystals are not detectable by the unaided eye (as opposed to phaneritic igneous rocks, where the minerals 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 quite 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 large inclusions are called phenocrysts. They consist essentially of very fine-grained minerals, such as plagioclase feldspar, with hornblende or augite, and may contain also biotite, quartz, and orthoclase.
  • L'aphanite est une roche magmatique dont la structure est à grain très fin. Les cristaux qui la composent sont si petits qu'ils ne peuvent être observés à l'œil nu. L'aphanite était utilisée par les artisans du Néolithique pour fabriquer des haches et autres outils.
  • Aphanitisch (griech. ἀ-, ἀν a-, an- = un-, nicht- und φανερός phanerós = sichtbar, offenbar) nennt man das Gefüge eines Gesteins, dessen Einzelbestandteile so feinkörnig sind, dass sie mit dem bloßen Auge nicht voneinander zu unterscheiden sind.
  • Afanitisch (van Grieks: ἀ-, ἀν ("niet"), φανερός ("Zichtbaar"); Engels: aphanitic) is in de petrologie de naam voor een textuur bij stollingsgesteentes, die geheel of grotendeels bestaan uit kristallen die te klein zijn om te onderscheiden. Afanitische gesteenten (soms afanieten genoemd) zijn kristallijne stoffen, maar de kristalijne textuur blijkt pas onder een microscoop. Het tegenovergestelde van afanitisch is faneritisch, een textuur van kristallen die groot genoeg zijn om met het blote oog te onderscheiden.
  • Afanítica é a designação dada à textura que pode ser encontrada em rochas ígneas e que consiste numa massa constituída por cristais de pequena dimensão e sem forma definida, que testemunham que a rocha em questão arrefeceu rapidamente, não permitindo que os cristais atingissem maior dimensão nem uma forma regular. Por vezes, no seio dessa massa, existem cristais de grandes dimensões, denominando-se então a textura da rocha em questão por textura porfirítica.
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