epistolite

== English == === Etymology === From Ancient Greek ἐπιστολή (epistolḗ, “letter, message”), because of its flat, white appearance, +‎ -ite. === Noun === epistolite (mineralogy) A triclinic-pinacoidal mineral containing calcium, fluorine, hydrogen, iron, manganese, niobium, oxygen, silicon, sodium, and titanium. === Further reading === David Barthelmy (1997–2026), “Epistolite”, in Webmineral Mineralogy Database. “epistolite”, in Mindat.org, Keswick, Va.: Hudson Institute of Mineralogy, 2000–2026.