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Szklary Chrysoprase Mine, Szklary (Gläsendorf), Ząbkowice (Frankenstein), Ząbkowice District, Lower Silesia (Dolnośląskie), Poland
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Photo: ishi-do
A silicate-type nickel deposit (nickel-bearing serpentinite), formed by hydrothermal and later lateritic weathering of ultramafic rocks (peridotites). The deposit is cut by numerous pegmatitic and oligoclasitic veins which are associated with a nearby Variscan syenite massif.

A pegmatite, which is exposed in one of the pits of the abandoned nickel mine, is listed as a separate locality (Mt. Szaklana).

The deposit, which was was mined since the Middle Ages for chrysoprase (first known occurrence), was explored for nickel since 1891, first from underground workings and, since 1935, from open casts. The mines were finally abandoned around 1980. Excavation of the locality arranged by the 1st Mindat conference organizers in July, 2010 resulted in a major find of exceptional pimelite specimens and a mineralogical investigation is underway to re-validate the species.

The chrysoprase occurs in veins to several cm thick which cut an altered ultramafic rock. In places, the body is covered by a saprolite rich in clay minerals, particularly smectite. The mine covers an area of many hectares. There are both underground and surface workings. The slope of the occurrence is covered with numerous small to large tailings piles where waste rock was dumped. Much of the area has been partially to completely covered by trees and bushes.

Mineral List

'Chlorite Group'
var: Bronzite
var: Bowlingite

27 entries listed. 15 valid minerals.

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- Spangenberg, K., and Müller, M. (1949): Die lateritische Zersetzung des Peridotits bei der Bildung der Nickelerzlagerstätte von Frankenstein in Schlesien. Contributions to Mineralogy and Petrology 1(5/6), 560-572 (in German).

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