광물 데이터베이스와 크리스탈 테라피광물TvrdýiteHenk Smeets – tomeikminerals.com·CC BY 4.0·WikimediaTvrdýiteFe2⁺Fe3⁺2Al3(PO4)4(OH)5(H2O)4·2H2OMonoclino root IMA approved구성Composizione (% in peso)OPFeAlOOxygen56.4%PPhosphorus16.2%FeIron14.6%AlAluminium10.6%HHydrogen2.2%어원명명 유래 Jaromír Tvrdý.
