鹼性玄武岩是澎湖常見的岩石，顏色大多為深黑色，當受氧化作用時，有時會呈現褐色或暗紅色。組成粒度較常見的是緻密細晶質。組成礦物主要為斜長石、橄欖石、鈦斜輝石及粒狀磁鐵礦等。所含的二氧化矽較低，多小於49％。岩漿由上部地函物質部分熔融所產生，深度大約在80公里處，平均溫度約在1250℃左右，所以岩漿來自較深部的地函。當岩漿噴出後，由於岩漿成分與急速冷卻的關係，柱狀體積較為細小，一般直徑約在50公分左右。鹼性玄武岩分布甚廣，其中以雞善嶼和錠鉤嶼最是美觀。本中心的鹼性玄武岩標本採自湖西青螺。
鹼性玄武岩是澎湖常見的岩石，顏色大多為深黑色，當受氧化作用時，有時會呈現褐色或暗紅色。組成粒度較常見的是緻密細晶質。組成礦物主要為斜長石、橄欖石、鈦斜輝石及粒狀磁鐵礦等。所含的二氧化矽較低，多小於49％。岩漿由上部地函物質部分熔融所產生，深度大約在80公里處，平均溫度約在1250℃左右，所以岩漿來自較深部的地函。當岩漿噴出後，由於岩漿成分與急速冷卻的關係，柱狀體積較為細小，一般直徑約在50公分左右。鹼性玄武岩分布甚廣，其中以雞善嶼和錠鉤嶼最是美觀。本中心的鹼性玄武岩標本採自湖西青螺。
Alkaline basalt is a common rock in Penghu, mostly dark black in color, sometimes browndark red when oxidized. Its most common composition granularity is densefine crystalline. Its main constituent minerals are plagioclase, olivine, titanitegranular magnetite. Its silicon dioxide content is low, mostly less than 49. The magma is produced by the partial melting of the upper mantle material, at a depth of about 80 kilometersat an average temperature of about 1250℃, so the magma comes from the deeper mantle. Due to the relationship between the magma compositionrapid cooling, the ejected magma forms a columnar volume that is relatively small, generally about 50 cm in diameter. Alkaline basalts are widely distributed,those at JishanyuDinggouyu are the most beautiful. The alkaline basalt specimens in this center were collected from Cingluo Village, Huxi Township.
