Keratophyre, generally refers to the sodium-rich marine silicate-aluminum neutral eruptive rock. Associated with the fine rock, and has a genetic connection. The German geologist C. W. Gombel proposed in 1874 that it originally refers to a kind of albite-bearing feldspar produced in Germany's Fichter Mountain. A neutral seabed eruptive rock. Rich in sodium. Often with a plaque structure. The phenocrysts are mainly albite, followed by sodium longer stones and potassium feldspars. Dark mineral porphyry is rare; the matrix is ​​cryptocrystalline, mainly composed of albite and sodium longer stones, followed by potassium feldspar and green. Mudstone, calcite, etc. Often symbiotic with the fine rock, and constitute the seabed fine Bijiao porphyry. The cause of this is that some people think that it is formed by the long-storied petrochemicals of the seabed, and some people think that it is a sodium-rich porphyry magma or basaltic magma.
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