1. Selenian: Selenian rocky planets are characterized by their high concentration of metallic elements, specifically iron and nickel. These planets are often rich in minerals such as pyroxene and olivine and may also have a thick iron core. Selenian planets are relatively common in the universe, accounting for approximately 30% of all rocky planets. 2. Enceladian: Enceladian rocky planets are known for their extreme temperatures. These planets are located closer to their star, resulting in scorching surface temperatures. The surface temperature range of Enceladian planets typically falls between 700 Kelvin (426 degrees Celsius) and 1500 Kelvin (1226 degrees Celsius). Enceladian planets make up around 20% of all rocky planets in the universe. 3. Adamean: Adamean rocky planets are incredibly rare and are composed primarily of diamond. These planets form under extreme pressure and temperature conditions, causing carbon atoms to crystallize into diamond structures. Adamean planets only account for a small percentage of rocky planets, approximately 2-3%. 4. Mineralic: Mineralic rocky planets, often referred to as crystal worlds, are characterized by their unique appearance. These planets have surfaces covered in crystalline structures, reflecting light in a mesmerizing manner. The exact composition of minerals can vary, including quartz, feldspar, and various gemstones. Mineralic planets are relatively common and account for approximately 45% of all rocky planets.