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Pretty sure that was calcite - famous for double refraction. https://sciencedemonstrations.fas.harvard.edu/presentations/double-refraction https://sciencedemon
by daniel_reetz 3y ago
Pretty sure that was calcite - famous for double refraction.
https://sciencedemonstrations.fas.harvard.edu/presentations/double-refraction https://sciencedemonstrations.fas.harvard.edu/presentations/...
- ChrisMarshallNY 3y agoYou are correct. I misremembered. Flourite was ... very fluorescent.
- kragen 3y agoas it turns out, pure fluorite has no fluorescence, even though fluorescence is named for fluorite
- ChrisMarshallNY 3y agoWell, it has been a long time (like, 40 years), but I’m pretty sure I remember it being strongly fluorescent. It might have been impurities, though.
- kragen 3y agoyeah, that's normal, which is why it's called fluorescence. pure natural minerals are very rare