Definition of "aragonite" []

• An orthorhombic mineral form of crystalline calcium carbonate, dimorphous with calcite. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Over time, the oyster wraps the grain in successive layers of aragonite, giving birth to a rare pearl."
• "They wandered through the Big Room, mesmerized by the translucent, calcite soda straws in the Doll's Theater, transfixed by threads of aragonite — sharp as needles — that spun around The Temple of the Sun."
• "They should probably be ordered according to hardness: diamond, olivine, aragonite, ice."