Moss agate tower Geode This is what's called vesicular

This is what's called vesicular basalt

The larger form of this growth is known as "poker chip" in the industry because the thin platelets commonly grow in stacks

Approx weight: 21g

but today are much harder to come by—at least with any size or quality

I was told that the black matrix is goethite

Moss agate tower Geode This is what's called vesicularApprox height: A 3. 5 inches B 3 inches C 2. 25 inches D 2. 75 inches Alternately called points or obelisks, these towers are cut and polished from extra holey moss agate. Agate is another member of the quartz family: the term is used to describe chalcedony (a cryptocrystalline form of quartz) that is banded, meaning it has stripes of color. The trade name 'moss agate' has stuck for this material even though it does not display the banding