{"id":1921,"date":"2026-02-26T09:04:45","date_gmt":"2026-02-26T01:04:45","guid":{"rendered":"https:\/\/jtlcnc.com\/?p=1921"},"modified":"2026-02-26T09:04:48","modified_gmt":"2026-02-26T01:04:48","slug":"the-structure-of-granite","status":"publish","type":"post","link":"https:\/\/jtlcnc.com\/ar\/2026\/02\/26\/the-structure-of-granite\/","title":{"rendered":"\u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0646\u064a\u062a"},"content":{"rendered":"


Structure refers to the size, shape, and arrangement of mineral grains. Granite is typically characterized by a crystalline granitic structure with semi-idiomorphic-idiomorphic mineral grains, coarse grain size, and time-crystallized (accessory minerals crystallize first, followed byz filling the gaps). The main types include:<\/p>\n\n\n\n

    \n
  1. By grain size:
    Fine-grained structure: Mineral grains with a diameter of <1mm, with delicate texture (such as the Niuchangshan rock mass). Medium-grained structure: Grains with a diameter of 1-5mm, with a uniform (common in most granite bodies). Coarse-grained structure: Grains >5mm, some reaching centimeter level, with a loose texture (such as Jingzhen granite).
    Special structure types:
    Porphyritic structure: Contains larger phenocrysts (e.g., potassium feldspar, diameter1cm) embedded in a fine-grained matrix (such as the specimen from Heihe City).
    Porphyritic structure: A natural transition in grain size betweenocrysts and matrix.
    Vuggy structure: Develops holes in the rock, filled with quartz or feldspar crystals.
    Gneissic structure:covite and other sheet-like minerals are arranged in a directional manner (affected by tectonic deformation).
    \u0647\u064a\u0643\u0644 \u0627\u0644\u062c\u0631\u0627\u0646\u064a\u062a
    Structure refers to the overall mineral distribution of the rock. Granite is dominated by massive structure:
    Massive structure: Minerals (quartz, feldspar, muscovite) are evenly distributed and have directional arrangement, accounting for the majority of granite.
    Other rare structures:
    Spheroidal structure: Minerals aggregate in a spherical shape (such as some metamorph granite).
    Porphyritic structure: Mineral distribution is uneven, with local enrichment.<\/li>\n<\/ol>\n\n\n\n

    Formation mechanism
    Structural differences stem from the rate of magma and depth: slow cooling in a deep-seated environment (>3km underground) forms medium-coarse-grained structure; rapid cooling or magma mixing can lead toorphyritic\/fine-grained structure (such as the injection of mafic magma producing perthite).<\/p>\n\n\n\n

    \"\"<\/figure>","protected":false},"excerpt":{"rendered":"

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