Crystals can be insoluble.Logical formLearned from9 sentences. A crystal can be rare.Logical formLearned from9 sentences. Crystals may undergo a use.Logical formLearned from9 sentences. A (rock crystal) can be carved.Logical formLearned from9 sentences. Crystals can be flawless.Logical formLearned from9 sentences. Crystals can be thick.Logical formLearned from9 sentences. Crystals may work.Logical formLearned from9 sentences. A crystal may double a frequency.Logical formLearned from9 sentences. Crystals may pertain-to the world.Logical formLearned from9 sentences. A crystal may undergo a discovery.Logical formLearned from9 sentences. Crystals can be gray.Logical formLearned from9 sentences. A crystal can be solid-state.Logical formLearned from9 sentences. Crystals can be constituted-of-or-filled-with plagioclase.Logical formLearned from9 sentences. (Crystal structures) can be organic.Logical formLearned from9 sentences. A (crystal structure) can be ordered.Logical formLearned from9 sentences.