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Szklary Chrysoprase Mine, Szklary (Gläsendorf), Ząbkowice (Frankenstein), Ząbkowice District, Lower Silesia (Dolnośląskie), Poland
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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

'Alipite'
Anthophyllite
Antigorite
'Chlorite Group'
Chromite
'Chrysoprase'
Chrysotile
Enstatite
var: Bronzite
'Garnierite'
Goethite
Hematite
'Iddingsite'
'Kerolite'
'Limonite'
Magnesite
Népouite
Nimite
'Olivine'
Opal
'Pimelite'
Quartz
Saponite
var: Bowlingite
'Stevensite'
Talc
Tremolite


27 entries listed. 15 valid minerals.

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References

- 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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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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