Chalcedony

Trevascus mine, Gwinear, Cornwall

Trevascus mine, Gwinear, Cornwall
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Trevascus mine, Gwinear, Cornwall Red and yellow concentric rings; polished. New South Wales, Australia This was a metamorphic rock that had been cross-cut by a network of quartz veins. Quartz is more resistant than the metamorphic rock, which contained minerals formed at high temperature and pressure. Consequently, the quartz veins have resisted weathering and stand proud. Hot Springs, Arkansas, USA.
Image Name: london_2014-04-18_10-28-58
Index Page:
Museums..Natural History Museum
File Name:london_2014-04-18_10-28-58
Index PageMuseums..Natural History Museum
Date2014-04-18 10:28:58
DescriptionTrevascus mine, Gwinear, Cornwall
CountyLondon
CountryUnited Kingdom
CopyrightCopyright 2014 Kenvyn & Debbie Davies
Tags 2014 Capital City City England Fujifilm Fujifilm X-T1 Fujinon Fujinon XF18-55mmF2.8-4.0 Geology Indoors Kensington London Museum Exhibit Natural History Museum
CameraFuji X-T1
LensXF18-55mmF2.8-4 R LM OIS 
Focal Length21mm
Focal Length (35mm)32mm
Shutter Speed1/70
Aperturef/3.2
ISO Speed200

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