quart and quartz It's a quarter past night. I learned a new word today, it is quartz(石英). I don't know if there is any correlation between quarter and quartz. Well, I don't know what to write and I am gathering the word count . I am too busy today and I must stop and think. The weather is getting colder and colder. In winter, pay attention to keep warm. Good night. :） Thank you for correcting my grammar mistakes.