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Aragonite
2005-05-26 12:17:18

Aragonite is a polymorph of the mineral calcite, both having the chemical composition CaCO3. Its structure differs from calcite and leads to a different crystal shape, an orthorhombic system with acicular crystals. By repeated twinning pseudo-hexagonal forms result. It may be columnar or fibrous, occasionally in branching stalactitic forms called flos-ferri (flowers of iron) from their...

Word of the Day
tapinage
  • The act of lurking; skulking about; hiding; keeping from sight.
The word 'tapinage' comes French 'se tapir' meaning 'to crouch, squat'.