Ortrit

Ortrit (az yunoni orthos — rost), allanit, mineralest ae guruhi epidot. Tarkibi khimiyaviash taqriban (Sa, Se, Mn)₂ (FeH, Fe3+, Mg) Al*[Si0₄] [Si₂07] O (ON). To 6% Se₂0z va aksar vaqt omekhtahoi Th, U, goho Y₂Os (to 8%) dorad. Sistemai kristallbandiash monoklini, kristallhoyash darozi prizma va nayzamonand.

Beshtar dar shakli donachaho va massahoi yaklukht vomekhurad. Rangash bur, siyoh, goho zard; jiloyash shishagun. Sakhtiash 6; murt; zichiash 4100 kilogramm/metr⁸. Radioakti­vist. Kamyoft. Odatan dar raghoi pegmatiti yakjoya bo digar mineralho va dar tarkibi granit ba shakli kristallhoi alohidai pareshon yoft meshavad. Ortit baroi hosil kardani se­riy, ittriy va gayra ashyoi khomi muhim ast.