Typical geodes
In this article, we explore the fascinating world of geodes, hollow spaces in rocks filled with beautiful minerals such as chalcedony, agate, and quar…
Category: Written in Stone post
Fact or fable? – Septarian concretions originate from deceased animals
Septarian are a special stone that attracts attention with its unique appearance. Moreover, an interesting story circulates about the origin of septarian dating back to…
Story behind the stone: sulfur from the Ijen volcano
Recently a friend gave me a beautiful piece of sulfur, he asked me if I knew where it came from, “Indonesia” I said. “Yes!” he…
Sphalerite or not? Part II
In my earlier article sphalerite or not? , which I told about some polished towers of “sphalerite” that I analyzed for one of my students…
Sphalerite or not? Part I
Quite some time ago I received from one of my students who also sells stones a number of polished towers of “sphalerite”. At least under…
Progress is impossible without change
New developments are piling up at Stack of Stones. Today, I am pleased to delight you with the first monthly ‘Written in Stone’ newsletter on…