the.com/aragonite
the same chemistry as chalk, but built like a knife instead of a smear
means A mineral form of calcium carbonate (CaCO₃) that shares its chemistry with calcite but crystallizes in a different, often needle- or column-shaped structure, found in pearls, coral skeletons, and certain limestones.
from Named in the early 19th century after Aragón, the region in northeastern Spain where it was first formally described — specifically from deposits near Molina de Aragón. The mineral takes the place-name and adds the standard mineralogical suffix '-ite,' the same ending that quietly labels countless rocks as 'a stony thing from here.'
- identical twin
- same formula as calcite, different crystal shape
- pearl maker
- mollusks layer it into shimmering nacre
- unstable
- slowly converts to calcite over geologic time
- named place
- first found in Molina de Aragón, Spain
- sea builder
- corals secrete it to construct entire reefs
mollusks shells — gastropods and bivalves produce aragonite shells instead of calcite, found in all oceans
great barrier reef — coral polyps build aragonite skeletons, covering 344,400 km² off australia
carlsbad caverns — aragonite needles form cave formations in new mexico, creating rare spar formations