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Took up crystal hunting as a hobby last month and this chart finally made the different systems click for me. The layout is organized enough that I can glance at it while sorting a new batch and instantly tell whether something's cubic or hexagonal. Way more useful than the blurry screenshots I'd be

I keep this chart on my desk while sorting my collection, and being able to compare all six crystal systems side by side has made identifying my specimens way easier. It's laminated too, so I don't worry about smudging it with dusty hands.

The layout is so clear that I can instantly tell the difference between tetragonal and orthorhombic — no more flipping through books. Makes my crystal study sessions much more efficient.