A Geoscience Digital Image Library

DescriptionGrossular is calcium-aluminum garnet, having ideal composition Ca3Al2Si3O12. Grossular, however, typically contains Fe, Mn and other elements in small amounts, so it comes in a variety of colors. It may be colorless, yellow, orange, green, red, grey or black. Grossular, like all garnets, forms dodechahedral (12 sided) crystals with each face having a rhombohedral shape. This crystal is about 5 cm across.
LocationMexico ▹ San Luis Potosi. Near Salinas.
PhotographerNessa Eull. 2001-04-09.
CollectionUniversity of North Dakota Mineralogy Collection #1171.
Key wordsgrossular, Mexico, Salinas
Tech details555 KB. Hand specimen. Fujifilm FinePix S1Pro digital camera; 60mm AF Nikon micro lens.
GeoDIL number304