Grossular

specimen number:
2062760

location:
Sierra de Cruces, Sierra Mojada, Coahuila, Mexico

description:
A grouping of lustrous yellowish-brown grossular crystals measuring to almost 3.0 cm in size. Crystallized all around, there are no points of attachment. This is in very good condition. Classic material for this Mexican locality. The specimen comes with a previous label from the collection of Ray DeMark.

The Sierra de Cruces Range is predominantly composed of Cretaceous limestone, alkaline diorite, and minor occurrences of dolomite. The formation of skarn in this area is attributed to contact metamorphism occurring at the interface between the plutonic body and the limestone. The majority of skarn and its associated ore deposits are found in proximity to the contact zone between carbonate rocks and intermediate-acid intrusive bodies, with carbonate rocks serving as the primary host. Notably, calcareous skarn that yields raspberry-red grossularite is located within the carbonate-rich host rock, and its mineral assemblages typically include grossularite, calcite, quartz, and idocrase, along with minor quantities of wollastonite, scapolite, and epidote.

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