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Roy Eugen Lunde's Photo Gallery

V5N-A1GHeulandite Subgroup (Na/Ca/K)5-6[Al8-9 Si27-28 O72]· nH2O , Clinoptilolite Subgroup M3-6(Si30Al6)O72·20H2O

02866710015478047695846.jpg
Johs Nilsens Quarry, Tvedalen, Larvik, Vestfold, Norway

Dimensions: 40 mm x 30 mm x 30 mm

A specimen found in a dump at Johs Nilsen larvikite quarry, Tvedalen, Larvik, Vestfold, Norway.
A crust of brownish, small heulandite crystals is seen in the middle of the specimen. Identity confirmed at NHM, Oslo, January 2019. The sample analysed showed a significant content of Ca, thus it is probably heulandite-Ca.

Analysis of the tube-like mineral showed it to consist of clinoptilolite, also with a significant content of Ca (Possible clinoptilolite-Ca?). The strange tube-structure may possible be a pseudomorph ?
This is the first report on a find of clinoptilolite from the Larvik Plutonic Complex.

Photo ID: 932710     Uploaded by: Roy Eugen Lunde   Upload date: 2019-01-18   View Count: 77    Status: User gallery only    Type: Photo - 3456×2304 (8.0 Mpix)
 
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