Sublimation product of gases escaping through vents in actively burning culm banks in anthracite coal deposits; forms at about 200 deg C near the vents.
IMA Status:
Approved IMA 1977
Locality:
Glen Lyon, Luzerne Co.,Pennsylvania, USA Link to MinDat.org Location Data.
Name Origin:
Named for Wayne F. Downey, Jr., of Harrisburg, Pennsylvania, USA, who first collected the mineral.
Chemical Formula: 