"Minerals of the Wolf Creek Formation"
Gwinnett County
Norcross Quadrangle


Specimen Photographs:
"Prehnite - Dravite - Hornblende"


Photograph - Dr. David Babulski
Collecting site "A".  Photomicrograph at 20x.
(Above and below)  

Prehnite nodules in vugs lined with chalcopyrite crystals coated with greenish tan chlorite.  Specimen extracted from a large quartz lens in coarse grained amphibolite.

Photograph - Dr. David Babulski
Collecting site "A".  Photomicrograph at 20x.  

Prehnite nodules and greenish tan chlorite.

Photograph - Dr. David Babulski
Collecting site "A".  Photomicrograph at 20x.  

Dravite variety tourmaline crystals with quartz.  Specimens from a large quartz lens in coarse grained amphibolite.  Note this tourmaline is very similar to dravite tourmaline found in veins and veinlets in the adjacent Norcross gneiss. 

Photograph - Dr. David Babulski
Collecting site "B".  Photomicrograph at 20x. 

Hornblende crystals in quartz.  These specimens extracted from a quartz epidote pod exhibiting en echelon fracture.  Some of these Hornblende crystals are 0.5 inches in length.

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