Final answer:
Direct characterization in the excerpt includes vivid descriptions of the character's commonsense, purposefulness, and personality, expressed through explicit and concrete imagery.
Step-by-step explanation:
The parts of the excerpt from Nathaniel Hawthorne's novel The House of Seven Gables that provide direct characterization include descriptions of the character's traits, such as 'Endowed with commonsense, as massive and hard as blocks of granite' and 'fastened together by stern rigidity of purpose, as with iron clamps'. These phrases directly describe the character's commonsense and purposefulness using concrete imagery. Additionally, the statement 'the Colonel, like most of his breed and generation, was impenetrable' suggests a general trait of his personality, again providing direct characterization. Direct characterization occurs when the author explicitly tells the audience about the traits of the character.