Topic: geology et al
The archaeology guy showed up again. He owed me $2, He gave me some Knife River flint. Still confusion over terminology.
I'm reading in the Minnesota geology book again. One of the final chapters. It is about southeastern Minnesota. It is a rugged area with hills formed by stream erosion, glaciers, wind and the solvent work of groundwater. The gradient out of the Mississippi river from Fort Snelling down is much lower than the northern portion which received a huge volume of water from Lake Agassiz. This glacial meltwater that cut a steeper gradient.
The sulfides (and selenides and tellurides) of the argentite group are argentite, aguilarite, naumannite, hessite and petzite. These occur with copper and sulphur. The minerals of this group vary in cleavage, brilliance and color. Most are blackish or silver. I did sell a sample of argentiferous galena recently, from Montana but I couldn't locate a source for more.
Am writing a confession that MIGHT require a few words of bislama, the way I have conceived of it. It's a form of pidgin English but it's a legitimate language.