SoCal FMS Meetings - Minerals of Africa November 2017
11/28/17 Changed misidentified shattuckite to scholzite.
It's that time of year again. SoCal FMS meets up at Jim's house to view the minerals he's collected. This time it was a theme rather than a special guest - African minerals. Alas my collection of African fluorescents was practically nonexistant. I don't really collect based on a continent. However, this didn't stop some of our members. Jim had quite an amazing collection of African fluorescents that he had collected over the past year, some of which I had absolutely no idea about.
Here's a 360 of all of the minerals. Some of the highlights are red manganocalcites, purple fluorites, orange sphalerite, green hyalite. Behind the starting point you can see some green fluorescing scholzite with some blue hemimorphite.
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And here are the closeups of the minerals. My favorite of the night is definitely the hemimorphite from the Skorpion mine in Namibia. Glenn Waychunas had originally discovered this but the hemimorphite had a very interesting aspect. First of all it was tenebrescent. After UV exposure it would turn to a light grey. Secondly it doesn't make a great fluorescent specimen at first. It's incredibly dim but it gets brighter over time! Video below:
Among some of the technical discussions that occured that night were instituted by a Ludlum geiger counter. Some of the minerals on the table ended up being slightly radioactive but this was before I got to the meeting. On top of that was the latest innovations in the SW LED world. I brought some of the brightest that were available at the time in 265nm and 275nm binnings. We determined that they were about as powerful as a 4W bulbed lamp. Color rendition is still a bit of a struggle with the reference Franklin material that we used. Specifically the calcite. While 265nm rendered the reds they weren't that bright. About the equivalent of what you'd see if you were to use my much brighter LW light. However, 275nm hardly rendered the calcite as all, proving that the peak activation of the Franklin calcite is lower in the UV spectrum.
Lastly are the minerals that caught my eye. To start off there's the bright orange tarbuttite. There were also some interesting phantomed and zoned calcites and fluorites. In addition Jim had obtained some of the very rare Skorpionite from the Skorpion mine. In Todd's possession was an interesting ruby specimen. Normally they fluoresce red but that one also had orange!
Corundum var. Ruby
A very rich piece of Cascade Canyon ruby. I collected this the second time I went there. I normally wouldn't photograph a specimen before I felt it was prepared. However, the fluorescent photos are representative enough and show just how much ruby is in this piece. Still on my list of to-dos for this specimen are to media blast it so that the rubies are fully exposed and hence their full fluorescent response can be seen. It's very low on my to-do list though. Specimen has been repaired.
Locale: Cascade Canyon, San Gabriel Mts, San Bernardino Co., California
Dimensions: 5.7 x 2.7 x 3.5 in | 145 x 70 x 90 mm
Weight: 1lb 1.7oz | 503g
Cascade Canyon November 2014
One of the people I had met during my paleontology days was a geologist named Russell. He was an adamant field collector but also a dealer. While he had collected fossils in the past, there was no money to be made with our material. Years later I realized he was right! Haha. However, once I turned more towards the geology side he took me to some very cool places. One of them was Cascade Canyon near Mt. Baldy. It was a beautiful hike with some interesting scenery - one of which was the house pictured below. When I was talking to Russell about Cascade Canyon on the phone one of the things he told me about was a Hansel & Gretel house that was along the way. This certainly matches that description!
One of my best Cascade Canyon specimens. A very rich ruby-filled piece.
From a later trip in June 2015. I only took 1 picture that day so there was no better place to put it. Featuring Marc Brown (foreground & Todd Richmond (background)
