Sherbrooke Pyrite Cube Specimens for Sale

 

PYRITE CUBES IN PHYLLITE

This material was field collected during road construction in the mid 1980’s and stored as “bulk rock”.  After two weeks (several long days) of trimming and preparation work they are ready to sell as attractive mineral specimens.  A few have cubes reattached because they popped loose, but only a few.  The white sometimes seen along the contact between the cube and the rock, phyllite, is fibrous quartz.  This is a rim (not glue, or crystal alteration, or anything else) and is discussed in a February 2013 letter to Rocks and Minerals Magazine by Dr. Peter Richards.  He notes:

“In 1986, Steve Chamberlain and I collected a large number of pyrite cubes embedded in phyllite from a road construction site near Sherbrooke, Quebec. These pyrite crystals also have rims of quartz, white and fibrous. The rims are thick in some areas and thin or absent in others. All rims are found in the same position in a given specimen, regardless of the orientation of the pyrite crystals. That is to say, the location of the rims seems to be a feature of the rock and not of the pyrite crystals.  After some research, I learned that these rims are known to metamorphic petrologists as pressure shadows and that they are often seen in various metamorphic rocks associated with impervious objects that are larger than the grain of the rock.”

These specimens have been photographed under low light so the details of their highly striated surfaces can be better viewed.  They are exceptionally bright having lusters in check with the finest pyrite specimens from other parts of the world.  I have not seen any of the specimens for sale in a very long time.  There are several boxes of other pieces in the $5 to $40 price range but these will only be offered at the few mineral shows I do including this year, 2014, at West Springfield, MA.

 

 

 

OKO-790

OKO-790       Pyrite       Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  This material was field collected during road construction in the mid 1980’s and stored as “bulk rock”.  After two weeks (several long days) of trimming and preparation work they are ready to sell as attractive mineral specimens.  The white seen along the contact between the cube and the rock, phyllite, is fibrous quartz.  This is a rim (not glue, or crystal alteration, or anything else) and is discussed in a February 2013 letter to Rocks and Minerals Magazine by Dr. Peter Richards.  He notes:

“In 1986, Steve Chamberlain and I collected a large number of pyrite cubes embedded in phyllite from a road construction site near Sherbrooke, Quebec. These pyrite crystals also have rims of quartz, white and fibrous. The rims are thick in some areas and thin or absent in others. All rims are found in the same position in a given specimen, regardless of the orientation of the pyrite crystals. That is to say, the location of the rims seems to be a feature of the rock and not of the pyrite crystals.  After some research, I learned that these rims are known to metamorphic petrologists as pressure shadows and that they are often seen in various metamorphic rocks associated with impervious objects that are larger than the grain of the rock.”

This piece has been photographed under low light so the details of itshighly striated surfaces can be better viewed.  It is bright having a luster in check with the finest pyrite specimens from other parts of the world.  It measures 7 x 6.1 x 4.2 cm and has the sngle cube seen that measures 2 cm on edge.  It is damage free (which in itself is very uncommon) and ranks as one of the finest of these that I have ever seen.  If it were from Spain, no big deal, but from this location it is an important piece!  $275

 

 

 

 

 

OKL-683   Pyrite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  This is the only loose crystal I will offer because it is exceptionally large ( 3.7 x 3 x 1.2 cm, edge measurements) and tabular, which is quite unusual for the find.  There is a small piece of attached matrix on one side and minor chipping but the specimen is in nice shape.  Unusual.  $50

 

 

 

 

 

 

 

OKL-684   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 9.3 x 4.5 x 4.2 cm with three cubes.  The largest cube is 2.2 cm on edge and spotless.  The other two cubes have one minor chip each.  Displays great.  Exceptionally fine specimen for the location.  $180

 

 

 

 

 

 

OKL-686   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix plate measuring 13.3 x 7.3 x 3 cm with six complete and undamaged crystals exposed on its surface!  This is the only specimen with this many nice undamaged crystals showing that was found.  Displays great.  $275

 

 

 

 

 

 

OKL-687   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine light colored matrix plate measuring 6.9 x 5.5 x 3.2 cm with two complete and undamaged crystals exposed on its surface, one on the back and one on the front.  Crystals are about the same size reaching 1.2 cm on edge.  $70

 

 

 

 

 

 

OKL-689   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 6.8 x 6 x 3.3 cm with two, sharp, undamaged cubes to 1.3 cm on edge.  Sits nicely… showy.  $95

 

 

 

 

 

 

 

OKL-692   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 7 x 5.5 x 4.2 cm with one nice undamaged cube measuring 1.4 cm on edge. An excellent example that displays well at least two different ways.    $70

 

 

 

 

 

 

 

OKL-693   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 5.7 x 4.5 x 3.4 cm with a beautiful, undamaged single cube that is 1.3 cm on edge.  Displays on edge with cube sitting up nicely.  $75

 

 

 

 

 

 

 

OKL-694   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 6.7 x 4.5 x 4.2 cm with a single undamaged cube measuring 1.6 cm $95

 

 

 

 

 

 

 

OKL-695   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 9 x 5.7 x 4.2 cm with a single perfect cube (zero damage) 1.7 cm on edge.  Displays great!  $90

 

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