Stones and gems of the USA

1strow Variscite, Utah Various silica, Oregon and Nevada Opal and jasper, Oregon   2ndrow Opal, Oregon and black jade (Arizona) Rhodonite, Colorado   3rdrow Andesite with Opal in Ryolite, Oregon Peridot, Arizona Vesicular basalt, Michigan   4throw...
Mine to You

Mine to You

A gemstone’s trip from the earth to your hands is often long and complicated.  From the time the stone leaves the earth, many people handle these objects/  This diagram, based on the many years’ experience of Eric Braunwart of Columbia Gem House,...

Millions of Names

The field of igneous petrology – the study of the chemistry and origins of the many igneous rocks around the world – is infamous for the number of names. It is off-putting for students and, frankly, I don’t know of anyone who has an interest in...

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