The Hidden Land - Sleeping Giants

Aileen David

Hawthorn, Australia

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Here’s another instalment tour into The Hidden Land.
As before, 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. With this series, I was handicapped as the specimens were behind glass cases; they were taken at the Australian Museum. I also only had what light was available there so positioning myself to get the best angles was key to capturing the images I wanted.

Giants; I see their faces…can you see them?

Microcline Feldspar
Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral. It is a potassium-rich alkali feldspar. Microcline typically contains minor amounts of sodium. It is common in granite and pegmatites. Microcline forms during slow cooling of orthoclase; it is more stable at lower temperatures than orthoclase. Sanidine is a polymorph of alkali feldspar stable at yet higher temperature. Microcline may be clear, white, pale-yellow, brick-red, or green; it is generally characterized by cross-hatch twinning that forms as a result of the transformation of monoclinic orthoclase into triclinic microcline. Microcline may be chemically the same as monoclinic orthoclase, but because it belongs to the triclinic crystal system, the prism angle is slightly less than right angles; hence the name “microcline” from the Greek “small slope.” It is a fully ordered triclinic modification of potassium feldspar and is dimorphous with orthoclase. Microcline is identical to orthoclase in many physical properties; it can be distinguished by x-ray or optical examination; viewed under a polarizing microscope, microcline exhibits a minute multiple twinning which forms a grating-like structure that is unmistakable.
from: Wikipedia

Artwork Comments

  • Mike Oxley
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  • Vanessa Barklay
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  • Elizabeth Rodriguez
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