Task: Class Definition Understanding (ontology: Earth_Environment/SWEET)

Which of the following definitions best describes 'oikocryst'?

A. Constituent forms a rigid arrangement of particles that support one another at their points of contact...constituting a mechanically firm structure capable of supporting open pore spaces, although interstices may be occupied by cement or matrix
B. Constituent occurs as crystals that poikilitically enclose crystals of other phases in an igneous rock.
C. a relatively large and conspicuous fragment in a sediment or sedimentary rock
D. constituent occurs as a collection of particles that are characterized by average properties of the individual particles

Answer: Constituent occurs as crystals that poikilitically enclose crystals of other phases in an igneous rock.