Reddit reviews Manual of Mineral Science (Manual of Mineralogy)
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Here's another novel idea... Since you're talking about crystals and crystallography, just give the presentation on minerals, symmetry, and the differences in crystalline structures. Here's a great source... this was the textbook from my mineraology class. https://smile.amazon.com/Manual-Mineral-Science-22nd-Mineralogy/dp/0471251771/ref=sr_1_8?ie=UTF8&qid=1519408780&sr=8-8&keywords=mineralogy
Just make it a geochemistry presentation, it would be HILARIOUS.
Or make absurd claims about how alpha quartz, beta quartz, tridamyte, and cristoballite all have different healing properties due to different pressures/temperature of formation (Show the phase diagram from the book), and how the earth imbues different quartz species with magical powers based on geologic depth of burial. And then you could also talk about how different colors of quartz (Caused by chemical impurities) have different "powers" due to iron, chromium, and other chemicals present.
I'd be very interested to help you make up scientifically founded pseudo-science to make the whole thing look ridiculous through sattire... I have a degree in geology with a specialization in geochemistry, so I could help you make up some very sweet bullshit. Since any source you may cite is of questionable verifiability (Meaning not peer reviewed), to me it seems like you can use peer reviewed materials to come to questionable conclusions and still be in the right.
Or just say "___ is believed to be a healing crystal" and talk about the mineralogy and petrology of it and nothing else.