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Pyrite and marcasite intergrowths
  
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Roger Warin




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PostPosted: Jul 03, 2017 13:33    Post subject: Pyrite and marcasite intergrowths  

Pyrite and marcasite intergrowths.

Pyrite microcrystals are attached to marcasite crystal in systematic orientations.
Pete Richards described intergrowths of pyrite and marcasite very similar to those observed on Moroccan specimens (The Mineralogical Record Vol. 26 March-April 1995).
On my specimen, marcasite is hidden by subsequent overgrowths of pyrite. The group resembles a fir tree.
Pete Richards says that the crystallization of pyrite is subsequent to that of marcasite, including epitactic growth of pyrite on marcasite. The pyrite forms bars. Richards's hypothesis which explains the geometric observations is that the pyrite is epitactic on an acicular marcasite crystal which is completely overgrown by the pyrite. For more information, see the Richards's article.
http://www.phy.mtu.edu/~jaszczak/SB734_05.pdf



078-Pyrite#3_R.jpg
 Mineral: Pyrite
 Locality:
Bou Nahas Mine, Oumjrane mining area, Alnif, Tarhbalt, Er Rachidia Province, Meknès-Tafilalet Region, Morocco
 Dimensions: 36 mm
 Description:
 Viewed:  1793 Time(s)

078-Pyrite#3_R.jpg



079-Pyrite_bar#2_R.jpg
 Mineral: Pyrite
 Locality:
Bou Nahas Mine, Oumjrane mining area, Alnif, Tarhbalt, Er Rachidia Province, Meknès-Tafilalet Region, Morocco
 Description:
 Viewed:  1789 Time(s)

079-Pyrite_bar#2_R.jpg



080-Pyrite_marcasite_A&B-1_R.jpg
 Mineral: Pyrite
 Locality:
Bou Nahas Mine, Oumjrane mining area, Alnif, Tarhbalt, Er Rachidia Province, Meknès-Tafilalet Region, Morocco
 Description:
 Viewed:  1804 Time(s)

080-Pyrite_marcasite_A&B-1_R.jpg


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