“There are over 3,000 known minerals. About 150 gem minerals. They are classified as: Group, Species, and Variety.” For example, “Can you identify the green stone now on the screen? Remember, there are a lot of possibilities.” Recently, I was invited to do a presentation on gemstones for two local North County San Diego clubs; Treasure Seekers of San Diego, and the Temecula Valley Prospectors. Their principal hobby is panning for gold. However, some dabble in mining gemstones. We had enthusiastic audience decidedly interested in learning more about gemstones, a proverbial “gold mine” for educators if you will. So, we dipped our fingers into some gem identification, discussed possible treatments, and reminded them to always suspect glass or plastic when they found something. I popped up a slide, gave them a few clues then asked the audience to identify the stone. Thankfully, this technique involved no awful smells from the use of refractive index liquid. The crowd lov...
A smidgen of history, a dash of culture - a minute dedicated to making you smile.