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Chalcedony (Var: Carnelian) : SiO2

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minID: 95Q-EKH

Chalcedony (Var: Carnelian) : SiO2

This image is copyrighted. Unauthorized reproduction prohibited.
Dimensions: 80 mm x 70 mm x 35 mm
Weight: 265 g

This red hot coal is an excellent natural pebble of fully transparent carnelian. The size is 8 x 7 x 3,5 centimeters and it weights 265 gram or a half pound.

The picture has been taken under artificial light and the color is not modified (RAW-Image). The color has not been distorted by this source of light and the color of transmitted daylight looks identical.

It is a natural pebble, which has not been treated or modified in any kind. It has not been cut or polished. All patterns of fine cracks and other surface features are preserved. It is almost perfect and has just one 1,5 x 0,5 cm cm internal crack on the backside (near the rim at the right side of the top, not visible in this picture). It has no banding and a almost uniform structure. This uniform appearance in combination with the light transmitting properties of the chalcedony give this carnelian an unrealistic and artificial look. The bright "internal reflections" on the sides are actually caused by the light transmission along the fibres of the of the chalcedony.

This Photo was Mindat.org Photo of the Day - 9th Nov 2017

This photo has been shown 849 times
Photo added:15th Sep 2013
Dimensions:1001x900px (0.90 megapixels)
Date/Time of Photo:13th Sep 2013 22:17:28
Camera:CANON EOS 350D / Digital Rebel XT / Kiss Digital N
Exposure time:1/100s
Aperture:f/9.0
Focal Length:54mm
ISO speed:800

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