twin crystal Directory References Discover How Did the Sperm Whale Get Its Name? Roman Catholic Saints 7 Unique Burial Rituals Across the World 10 Failed Doomsday Predictions 7 Deadliest Weapons in History Will Light-Speed Space Travel Ever Be Possible? All 119 References in “We Didn’t Start the Fire,” Explained Contents twin crystal crystallography Ask the Chatbot a Question Ask the Chatbot a Question Learn about this topic in these articles:twinning In twinningOther grains added to the twin form crystals that often appear symmetrically joined, sometimes in a starlike or crosslike shape. Read More