A Geoscience Digital Image Library

TitleAragonite from near Alston Moore, England
DescriptionAragonite is a polymorph of calcite, meaning it has the same composition but different structure and crystal shape. Single crystals of aragonite have orthorhombic habits (related to a shoe-box shape) but sometimes aragonite is twinned (multiple intergrown crystal domains) and has a hexagonal appearance, as in this sample. Reentrant angles, formed at twin boundaries can be seen in this photo (but it takes very discerning vision). This specimen is 4 cm across.
LocationEngland. Near Alston Moore.
PhotographerDarla Sondrol. 2001-06-12.
CollectionUniversity of North Dakota Mineralogy Collection #663.
Key wordsaragonite, England
Tech details474 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number725