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Marcassite


Marcassite
Photo Information
Copyright: Sylvain Td (Sylvain_Td) (26)
Genre: Monera
Medium: Color
Date Taken: 2006-03-21
Camera: Sony Cybershot DSC V3
Exposure: f/6.3, 1/125 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2006-03-30 13:01
Viewed: 5048
Points: 2
[Note Guidelines] Photographer's Note [French]
MARCASSITE:
The marcasite is a frequent metal mineral. It constitutes dimorphous orthorhombic pyrite. This mineral is formed at low temperature under very acid conditions and meets mainly in the sedimentary contexts (limestones, marls, chalk) and the hydrothermal seams. It also frequently results from the transformation of the pyrhotite. Of metallic lustre, its color on fresh break is white of tin transfering quickly with the yellow bronzes by exposure to the air. The marcasite meets in spherical nodules fibroradiés (frequent in the sedimentary formations) and out of tabular crystals on {010} frequently twinned on {101} giving by repetition of the facies in cockscombs.


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Critiques [Translate]

  • Great 
  • thor68 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 795 W: 138 N: 1319] (5674)
  • [2006-03-31 14:40]

hi sylvain,
very nice and sharp macro-shot,
i really like the dark BG.
one doesn´t see many stones and minerals
on TN.
good job, thor.

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