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Artichoke Vinagrette | all galleries >> Galleries >> minerals > selenite crystal
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29-DEC-2006

selenite crystal

Houston Museum of Natural Science

a most curious crystal
thanks to Yves for the ID (see comment below)
to get adequate DOF, I used a composite of two 12 MB jpg files for this

FujiFilm FinePix S3 Pro ,Nikkor 105mm f/2.8G ED-IF AF-S VR Micro
1/20s f/5.6 at 105.0mm iso 800 monopod hide exif
Full EXIF Info
Date/Time29-Dec-2006 16:44:22
MakeFujiFilm
ModelFinePix S3Pro
Flash UsedNo
Focal Length105 mm
Exposure Time1/20 sec
Aperturef/5.6
ISO Equivalent800
Exposure Bias
White Balance
Metering Modecenter weighted (2)
JPEG Quality
Exposure Programmanual (1)
Focus Distance

other sizes: small medium large original auto
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Yves Rubin06-Apr-2007 16:42
Superb! It is called selenite, crystals of calcium sulfate (or gypsum, or plaster, yes!) They have this curious way to grow in diformed shapes through a crystallization process called twinning http://en.wikipedia.org/wiki/Selenite).
Cheers,
Yves