The Hidden Land - Where Dragons Sleep

Aileen David

Hawthorn, Australia

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Artist's Description

This is the last batch of my The Hidden Land collection from the Australian Museum.

As before, the handicaps and limitations of the shots are the same – behind glass cases and limited lighting. This collection features rocks and minerals highlighting their unique properties and formations. I always try to take as macro a shot as I can without loosing too much information about my subjects. Some post work was needed to bring out the textures and balance the lighting – Tone Curve, Saturation and Gamma.

Best viewed larger…really

Molybdenite on Quartz
_Molybdenite is a mineral of molybdenum disulfide, MoS2. Similar in appearance and feel to graphite, molybdenite has a lubricating effect that is a consequence of its layered structure. The atomic structure consists of a sheet of molybdenum atoms sandwiched between sheets of sulfide atoms. The Mo-S bonds are strong, but the interaction between the sulfur atoms at the top and bottom of separate sandwich-like tri-layers is weak, resulting in easy slippage as well as cleavage planes.

Molybdenite occurs in high temperature hydrothermal ore deposits. Its associated minerals include pyrite, chalcopyrite, quartz, anhydrite, fluorite, and scheelite. Important deposits include the disseminated porphyry molybdenum deposits at Questa, New Mexico and the Henderson and Climax mines in Colorado. Molybdenite also occurs in porphyry copper deposits of Arizona, Utah, and Mexico.

The element rhenium is always present in molybdenite as a substitute for molybdenum, usually in the parts per million (ppm) range, but often up to 1–2%. High rhenium content results in a structural variety detectable by X-ray diffraction techniques. Molybdenite ores are essentially the only source for rhenium. The presence of the radioactive isotope rhenium-187 and its daughter isotope osmium-187 provides a useful geochronologic dating technique._

from: Wikipedia

Artwork Comments

  • sfmilner
  • Aileen David
  • Mike Oxley
  • Mike Oxley
  • Aileen David
  • Hélène David-Cuny
  • Aileen David
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