By definition, basalt is an aphanitic igneous rock with less than 20% quartz and less than 10% feldspathoid by volume, and where at least 65% of the feldspar is in the form of plagioclase. Basalt features a glassy matrix interspersed with minerals.The average density is 3.0 gm/cm 3.y definition, basalt is an aphanitic igneous rock with less than 20% quartz and less than 10% feldspathoid by volume, and where at least 65% of the feldspar is in the form of plagioclase. Basalt features a glassy matrix interspersed with minerals.
An antigen is defined as a substance that reacts with antibody molecules and antigen receptors on lymphocytes. 2. An immunogen is an antigen that is recognized by the body as non-self and stimulates an adaptive immune response. 3. Chemically, antigens are large molecular weight proteins and polysaccharides. 4.
Self antigens are usually tolerated by the immune system; whereas Non-self antigens are identified as intruders and attacked by the immune system. Autoimmune disorders arise from the immune system reacting to its own antigens. 3 people found this useful.