Tag: fortification agate

Flower Garden Agates

Flower Garden Agates

This is why I love cutting material from The Carver! Rock 4582 Rock 4538 The oval flower garden agate cab has a white fortification agate in the center. A fortification agate is named for the pattern that would be seen on the ground if one were looking down from above upon an old-fashioned fortress—think Fort Ticonderoga. (See Gemstones of the World, by Walter Schumann, page 134, 1977 edition, for discussion and photos of the fortification agate.) The point of this blog, beyond the beauty of these flower garden agates, is that it is very complicated and difficult to exactly identify a particular type of agate, particularly when many agates contain within them several identifiable specific types of agate. Ergo, this is a flower garden agate with a fortification agate in it. Rock #4538 Detail

New Year Powder Blue Fortification Agate Bracelet

New Year Powder Blue Fortification Agate Bracelet

This bracelet and its powder blue agate stone were created just before Christmas 2019–the only bracelet I made in 2019. It is a great start for 2020 and is gemologically interesting. Though at first, this blue agate may merely seem beautiful and elegant, it is much more, particularly if you like rocks like I do! First, the lower right hand corner of the stone has a half moon shaped blue area of finely banded agate. This fine blue banding displays opalescence, e.g., its blue color and reflectivity subtly changes depending upon the intensity and type of light (natural, incandescent, fluorescent, LED, etc.). Second, the orientation of the stone to the light will change its reflectivity and brightness.  This is very much what you would see with certain types of precious opal.  Third, the fortification agate (named so because it has a shape with angular corners, like looking down from above […]

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