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Mineral Specimen #4815    Twinned Calcite Crystals, Minor Pyrite

Penrhyn Slate Quarry, Bethesda, Gwynedd, Wales

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/

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

$25      Click here to order this mineral.                                                                                                                                                              

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