The sky can be (crystal blue).Logical formLearned from10 sentences. A need can be for crystals.Logical formLearned from10 sentences. Some rocks can be constituted-of-or-filled-with (crystal methamphetamine).Logical formLearned from10 sentences. Some (plastic bags) may contain some rocks of (crystal methamphetamine).Logical formLearned from10 sentences. Hundreds can be constituted-of-or-filled-with crystals.Logical formLearned from10 sentences. A (rock crystal ewer) can be carved.Logical formLearned from10 sentences. Crystals can be metallic.Logical formLearned from10 sentences. A pile can be constituted-of-or-filled-with crystals.Logical formLearned from10 sentences. A crystal may form.Logical formLearned from10 sentences. Crystals can be colourless.Logical formLearned from10 sentences. Crystals can be slender.Logical formLearned from10 sentences. Masses can be constituted-of-or-filled-with crystals.Logical formLearned from10 sentences. A crystal can be thin.Logical formLearned from10 sentences. Crystals may undergo concentrations.Logical formLearned from10 sentences. A crystal can be exquisite.Logical formLearned from10 sentences.