Herderite vs Phenakite
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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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Phenakite
Phenakite, also spelled phenacite, is a beryllium silicate mineral with the chemical formula Be2SiO4. It commonly forms transparent, colorless crystals but may also appear pale yellow, pink, or brown, and its hardness and relatively high refractive index allow suitable specimens to be cut as gemstones. Notable occurrences include Russia's Ural Mountains and Minas Gerais in Brazil, although fine cr...
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