Home > Type Locality Minerals – September 21 > MS1259 Greenockite

Greenockite


Greenockite is simple cadmium sulfide (Connell, 1840). The mineral name honors Lord Greenock, whose given name is Charles Murray Cathcart (1783-1859), discoverer of the mineral (Thompson, 1840). Greenockite has hexagonal symmetry, and is a well known example of a hemimorphic mineral. Hemimorphism implies a lack of a center of symmetry; this allows one half of a crystal to display outward forms unrelated to those on the other half of the crystal.

This specimen consists of botryoidal prehnite grown over basaltic matrix. The prehnite spheres reach 5 mm on this piece; there is also minor stilbite-Ca present. There are two greenockite crystals present, the first of type 2 (see Thompson) measures 1.5 mm, and the second of type 2 (see Thompson) measures 2.5 mm. Interesting mineral!

Price: $400

Item code: MS1259

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