Rutile vs Herderite
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Rutile
Rutile is a naturally occurring oxide mineral composed mainly of titanium dioxide (TiO2). Its tetragonal crystals are commonly reddish-brown or yellow-brown and have a very high refractive index, strong birefringence, and notable dispersion. Fine rutile needles in quartz and other gems can create chatoyancy or asterism when aligned, and rutilated quartz is a recognized collector and gem material....
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Herderite
Herderite is a calcium beryllium phosphate mineral in the apatite group, with the formula CaBe(PO4)(F,OH). It crystallizes in the monoclinic system and commonly appears as colorless, pale-yellow, or greenish-white prismatic crystals; transparent crystals from Minas Gerais, Brazil, have been cut as gems. Herderite forms a compositional series with hydroxylherderite, a related mineral reported from...
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