Explanation
A basic lava rich in sodium feldspar erupted from the sea floor. The mineral composition is complex and varies greatly. phenocryst minerals are mainly sodium feldspar and pyroxene; The matrix is composed of chlorite, actinolite, caldte, epidote, grape stone, chalcedony and changed glassy substance. It is grayish green and light green, often with a fine blue structure and pillow shaped structure. It often forms submarine volcanic extrusive rock series (commonly called spilite hornblende porphyry series) with hornblende porphyry and quartz hornblende porphyry. It is often accompanied by rich layers of pyrite and chalcopyrite.
Classification
Natural materials and products -> Mineral materials