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Mylius, Gottlieb Friedrich (1709-1718)

Zagora (IAB silicated iron) found in Morocco in 1987

Zimmermann, Rudolph (1904)

Rutilated quartz is a rare mineral that is mainly made up of titanium dioxide. One of its most outstanding physical properties is that is has a remarkably high refractive index which makes it to disperse plenty of light, more than any other mineral known to mankind.

Schorl (Black Tourmaline) Erongo Mountains Namibia

Chrysacola druzy and Malachite