The spelling of the word "selenitian" can be understood using the International Phonetic Alphabet (IPA). It is pronounced as /sɪˈlɛnɪtɪən/, with the stress on the second syllable. It is derived from the word "selenite," which refers to a type of mineral that is composed of calcium sulfate. "Selenitian" refers to anything that pertains to or is characteristic of selenite. The correct spelling of this word ensures clear communication and eliminates confusion in written communication.