Penrhyn Slate Quarry, Bethesda, Gwynedd, Wales

6.2 x 5 x 1.9 cm
largest crystal is 1.5 cm across

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Ex. H. R. McBroom from trade with Eric Otty, 1980

Twinned crystals of Calcite which are an off white color on a dark matrix which contains small, cubic Pyrite crystals. From a location from which specimens are seldom available. The quarry was once the world's largest slate quarry and is over a mile long (1.6 km) and over 1200 feet (370 m) deep. The quarry was first opened in 1770 and is still in operation.

Condition: Fairly Good

Flaws: Only about 1/3 of the surface of the specimen has extant crystals. On the crystals, there are a few small chips. Some of the crystals have internal cleaves/

This mineral is also found in the following galleries: Minerals From Europe | Calcite | Sulfides and Sulfosalts | Minerals Priced Between 25 and 49 Dollars