岩脈為岩漿上升穿過地層時所留下的痕跡，大多分佈於火山口地下深處，後因四周圍繞的岩層被風浪雨水侵蝕而露出地表，為典型近火山口岩相，當玄武岩岩漿侵入岩石縫隙中，冷卻後其岩脈節理有的會呈板狀構造。澎湖群島岩脈出露甚多，走向無一定之規則。岩脈主要出露地點有大石鼻、港底灣、北寮奎壁山、赤崁仔頭、大貓嶼、七美龍埕和牛母坪等地，花嶼則有石英岩岩脈、流紋岩岩脈等出露。本中心收藏標本採集自湖西西溪。
岩脈為岩漿上升穿過地層時所留下的痕跡，大多分佈於火山口地下深處，後因四周圍繞的岩層被風浪雨水侵蝕而露出地表，為典型近火山口岩相，當玄武岩岩漿侵入岩石縫隙中，冷卻後其岩脈節理有的會呈板狀構造。澎湖群島岩脈出露甚多，走向無一定之規則。岩脈主要出露地點有大石鼻、港底灣、北寮奎壁山、赤崁仔頭、大貓嶼、七美龍埕和牛母坪等地，花嶼則有石英岩岩脈、流紋岩岩脈等出露。本中心收藏標本採集自湖西西溪。
Dykes are the traces left by the lava rising through the stratum, most of which are distributed deep underground in volcanic cratersthen exposed to the surface due to the erosion of the surrounding rock layers by wind, wavesrain. It is a typical lithofacies near the crater. When the basalt lava intrudes into the rock crevices, some of its dyke joints will take on a plate-like structure after cooling. Many dikes are exposed in the Penghu Islands,there are no certain rules for their direction. The main outcropping sites of the dikes are Dashibi, Gangdiwan, Kueibishan in Beiliao Village, Chihkanzaitou, Damaoyu, Dragon Sea-eroded Platform in Qimei Township, Niumuping,so on. Exposed in Huayu are quartzite dykesrhyolite dykes. Specimens collected by this center are from Sisi Village, Huxi Township.
