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                                                    Woods Chrome Mine

                                          Nottingham, PA

 

April 28, 2012, Saturday: Woods Chrome Mine,            Nottingham, PA (9AM+) Time changed! 1pm to 5pm

Site Geology

Geology and Minerals:  The large variety of minerals at the Wood Mine is the result of a complex geologic history.  Each of the different geologic processes crystallized a particular suite of minerals, so that association becomes an important clue to the minerals which one can expect to find.  The first event was the intrusion of a dark-colored rock (dunite) rich in olivine, and containing lesser amounts of enstatite, chromite and magnetite.  The second major event was the introduction of hot solutions whose composition was approximately that of serpentine.  These solutions also attacked the olivine-enstatite-chromite rock and formed new minerals in addition to the serpentine (antigorite and chrysotile).  The new minerals thus formed were magnetite, uvarovite,  Chrome-antigorite, and chrome-chlorite (kammererite).  Later, the composition of the thermal solutions became such that chlorite-vermiculite, clinochlore, and small amounts of pyrite were formed.  Some magnesite and brucite may also have formed along fractures in the rock.  At this time, there was no more chromium available to incorporate in definite minerals, so that although these minerals are found in serpentinite, they generally are not closely associated with chromite.  Following this later geologic event, weathering, ground waters, and relatively low temperature solutions resulted in the deposition of magnesite, hydromagnesite, calcite, chalcedony, aragonite, deweylite, cacoxenite, genthite, brucite, and zaratite along fractures and in vugs within the serpentinite rock.

Safety and Liability:  Steel-toed shoes, hard hat, safety glasses and gloves are required.  Wear clothing appropriate for the season.   

If the ground is too wet we’ll have to park most of our cars on the driveway and take only a few 4-wheel drive vehicles to the collecting area.

Directions:
  Directions will be provided to club members participating in the field trip.

Gear: 
 This is mainly a digging site.  Bring pick, shovel, hammers, chisels, prybar, brush clippers, small limb saw, hoe, handtruck, boxes, wrapping.   Mechanical excavation is no longer allowed at this site.

DMS Contact:  Tom Pankratz  (cell 302 766 0127  email tjpankratz@verizon.net) .   I will be travelling Sept 3 – 18; during this time please contact me by email only.

[Tom Pankratz, Vice-President of Fieldtrips]

 

 


 

 

Geologic Time Scale


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This page last updated:  April 26, 2012 11:38:06 PM


Next Meeting
 

January Program, Monday, January 13, 2014:

"DVD Presentation, Election"

General Club Meeting:
January 13, 2014
(Monday)

We are meeting at
The Historic Greenbank Mill,  Wilmington, DE


Special Meetings:
 

*Show Committee Meeting, January 9, 2014

*New Home/Lapidary Committee, 2014

*Board Meeting, to be determined

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March 1-2, 2014 at DelTech Stanton

 


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