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porphyritic adj.【地質學;地理學】斑巖的,斑狀的。

porphyroid

Four major rock types are found within the reserve . from the oldest to the youngest , they are the tuffs with volcanic bombs , granodiorites , porphyritic rhyolites and basaltic dykes , respectively . geomorphologically , the marine reserve has typical exposed rocky shore of south - easterly - directed capes and headlands in hong kong 鶴咀海岸保護區內可以找到四種主要巖石種類,以巖石形成的年代計算,最古老的是火山爆發形成的凝灰巖,然后依次是花崗閃長巖,流紋斑巖及玄武巖。