A crystal can be engraved.Logical formLearned from38 sentences. Crystals may pertain-to a writer.Logical formLearned from38 sentences. A (crystal ball) can be cloudy.Logical formLearned from38 sentences. Crystals can be thin.Logical formLearned from37 sentences. Crystals can be constituted-of-or-filled-with quartz.Logical formLearned from37 sentences. Crystals can be fibrous.Logical formLearned from37 sentences. A structure may pertain-to a crystal.Logical formLearned from36 sentences. Thousands can be constituted-of-or-filled-with crystals.Logical formLearned from36 sentences. Atoms can be in a crystal.Logical formLearned from35 sentences. A (crystal structure) can be hexagonal.Logical formLearned from35 sentences. Crystals can be flat.Logical formLearned from35 sentences. A lobby may display (crystal chandeliers).Logical formLearned from34 sentences. Liquid crystal can be on silicon.Logical formLearned from33 sentences. (Crystal embellishments) can be black.Logical formLearned from33 sentences. (Ice crystals) can be hexagonal.Logical formLearned from33 sentences.