Cutting elements for earth-boring tools, earth-boring tools including such cutting elements, and related methods

An earth-boring tool, comprising:

• at least one cutting element affixed to a tool body, the at least one cutting element comprising:
• a substrate;
• and
• a volume of superabrasive material disposed on the substrate, the volume of superabrasive material having a cutting face comprising a domed surface, the cutting face having a first portion having a first surface roughness and a second portion having a second surface roughness greater than the first surface roughness, wherein a boundary between the first portion and the second portion extends linearly across the domed surface, and wherein the at least one cutting element is affixed to the tool body so as to generate a single stream of formation cuttings moving laterally away from a center of the cutting face when the at least one cutting element and the earth-boring tool are used to cut a subterranean formation.

A method of forming a cutting element for an earth-boring tool, comprising:

• forming a volume of superabrasive material having a cutting face comprising a domed surface and a shaped feature, the shaped feature comprising at least one of a recess extending into the volume of superabrasive material from the cutting face and a protrusion extending outward from the cutting face;
• providing a first portion of the cutting face with a first surface roughness, wherein the first portion comprises at least a portion of the domed surface of the cutting face;
• providing a second portion of the cutting face with a second surface roughness greater than the first surface roughness, wherein the second portion comprises at least another portion of the domed surface of the cutting face, wherein a boundary between the first portion and second portion extends linearly across the domed surface and generally through a center of the cutting face;
• and
• configuring the domed surface of the cutting face to generate a single stream of formation cuttings moving laterally away from the center of the cutting face.