Cinder/Scoria

Cinder/Scoria is a collective name of cinder/scoria -shaped fragments produced by a volcano. Most of the cinder/scoria is highly vesicular, generally black, dark brown or purplish red, and in composition of basaltic or andesitic. It can't float on water because its density is larger than that of water and acidic pumice. There are two mechanisms of formation of Cinder/Scoria. In one mode (Cinder or Scoria), when the liquid lava fragments full of gases were erupted and solidified in the air, the dissolved gases out of lava fragments expanded and escaped, while leaving holes or vesicles in lava and forming cinder-shaped appearance. This kind of cinder-shaped fragments often fell around volcanic craters. In another mode (Scoria), the solidified vesicular outer shell of lava flows or volcanic bombs cracked and produced scoria. Here the scoria-shaped fragments were formed by the second mechanism. Besides, scoria is a kind of good natural heat-insulating material.
地址: 牡丹江市景福街70号    电话: 0453-6996711    传真: 0453-6270037
© 黑龙江镜泊湖风景名胜自然保护区管理委员会