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      Agglomerate (from the Latin agglomerare meaning "to form into a ball") is a coarse accumulation of large blocks of volcanic material that contains at least 75% bombs. Volcanic bombs differ from volcanic blocks in that their shape records fluidal surfaces: they may, for example, have ropy, cauliform, scoriaceous, folded, spindle, spatter, ribbon, ragged, or amoeboid shapes. Globular masses of lava may have been shot from the crater at a time when partly molten lava was exposed, and was frequently shattered by sudden outbursts of steam. These bombs were viscous at the moment of ejection and by rotation in the air acquired their shape. They are commonly 1 to 2 feet (30 to 60 cm) in diameter, but specimens as large as 12 feet (3.7 m) have been observed. There is less variety in their composition at any one volcanic centre than in the case of the lithic blocks, and their composition indicates the type of magma being erupted.
      Agglomerates are typically found near volcanic vents and within volcanic conduits, where they may be associated with pyroclastic or intrusive volcanic breccias. Older (pre-1970) publications, particularly in Scotland, referred to any coarse-grained volcaniclastic rock as 'agglomerate', which led to debris flow deposits, talus deposits and other types of breccia being mistaken for vents. Agglomerates are typically poorly sorted, may contain a fine ash or tuff matrix and vary from matrix to clast support. They may be monolithologic or heterolithic, and may contain some blocks of various igneous rocks. There are various differences between agglomerates and ordinary ash beds or tuffs. Agglomerates are coarser and less frequently well-bedded. Agglomerates can be non-welded or welded, such as coarse basaltic 'spatter'. They typically form proximally during Strombolian eruptions, and are common at strongly peralkaline volcanoes. Some large agglomerate deposits are deposited from pyroclastic density currents during explosive caldera-forming eruptions, such as at Santorini, Taal, and Campi Flegrei. They may be massive to crudely bedded, and can attain great thicknesses.
      Crystalline masses of a different kind occur in some numbers in certain agglomerates. They consist of volcanic minerals very much the same as those formed in the lava, but exhibiting certain peculiarities which indicate that they have formed slowly under pressure at considerable depths. They bear a resemblance to plutonic igneous rocks, but are more correctly to be regarded as agglomerations of crystals formed within the liquid lava as it slowly rose towards the surface, and at a subsequent period cast out by violent steam explosions. The sanidinites of the Eifel belong to this group. At Vesuvius, Ascension, St Vincent and many other volcanoes, they form a considerable part of the coarser ash-beds. Their commonest minerals are olivine, anorthite, hornblende, augite, biotite and leucite.


      See also


      Agglomerate (Steel industry)
      Sinter plant


      References



      This article incorporates text from a publication now in the public domain: Chisholm, Hugh, ed. (1911). "Agglomerate". Encyclopædia Britannica. Vol. 1 (11th ed.). Cambridge University Press. pp. 374–375.

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    Agglomerate | Word Genius

    Agglomerate | Word Genius

    Agglomerate | Word Genius

    Agglomerate | Word Genius

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    Why Agglomerate Your Material

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate - definition of agglomerate by The Free Dictionary

    Agglomerate - definition of agglomerate by The Free Dictionary

    Agglomerate, Ercall quarry.

    Agglomerate, Ercall quarry.

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate | Properties, Composition, Formation » Geology Science

    Agglomerate hi-res stock photography and images - Alamy

    Agglomerate hi-res stock photography and images - Alamy

    Conglomerate vs. Agglomerate — What’s the Difference?

    Conglomerate vs. Agglomerate — What’s the Difference?

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    Agglomerate Definition & Meaning - Merriam-Webster

    The meaning of AGGLOMERATE is to gather into a ball, mass, or cluster. How to use agglomerate in a sentence.

    Agglomerate - Wikipedia

    Agglomerate (from the Latin agglomerare meaning "to form into a ball") is a coarse accumulation of large blocks of volcanic material that contains at least 75% bombs.

    Agglomerate - definition of agglomerate by The Free Dictionary

    Gathered into a rounded mass. 1. A confused or jumbled mass; a heap. 2. A volcanic rock consisting of rounded and angular fragments fused together. [Latin agglomerāre, agglomerāt-, to mass together : ad-, ad- + glomerāre, to form into a ball (from glomus, glomer-, ball).] ag·glom′er·a′tor n.

    Agglomerate | Igneous Rocks, Volcanic Rocks & Magma | Britannica

    Agglomerate, large, coarse, rock fragments associated with lava flow that are ejected during explosive volcanic eruptions. Although they closely resemble sedimentary conglomerates, agglomerates are pyroclastic igneous rocks that consist almost wholly of angular or rounded lava fragments of varying.

    AGGLOMERATE | definition in the Cambridge English Dictionary

    AGGLOMERATE meaning: 1. to join or stick together to form a larger mass or group, or to cause something to do this: 2…. Learn more.

    Agglomerate - Definition, Meaning & Synonyms - Vocabulary.com

    When things agglomerate, they gather together into a cluster or a group. In some states, people tend to agglomerate into cities, leaving rural areas sparsely populated.

    AGGLOMERATE Definition & Meaning - Dictionary.com

    to collect or gather into a cluster or mass. gathered together into a cluster or mass. Botany. crowded into a dense cluster, but not cohering. a mass of things clustered together. rock …

    Agglomerate Definition & Meaning - YourDictionary

    Agglomerate definition: To form or collect into a rounded mass.

    AGGLOMERATE definition and meaning | Collins English Dictionary

    AGGLOMERATE definition: to form or be formed into a mass or cluster ; collect | Meaning, pronunciation, translations and examples

    agglomerate noun - Definition, pictures, pronunciation and usage …

    Definition of agglomerate noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.