Fine prismatic reynoldsite on stalactitic coronadite/lithiphorite. From: Red Lead Mine, Dundas mineral field, Zeehan district, West Coast municipality, Tasmania, Australia. — Photo: Ralph Bottrill · CC BY 3.0
Reynoldsite
Reynoldsite is an IMA-recognized mineral species in the chromate class, with the chemical formula Pb₂Mn⁴⁺₂O₅(CrO₄).
It crystallizes in the triclinic crystal system (space group P-1).
Key properties: Mohs hardness 4.5; specific gravity 6.574; Dark orange-brown streak; Subadamantine luster.
IMA symbol Ryn, IMA status: approved, named in 2011.
A secondary mineral derived by weathering primary minerals including oxides and sulfides in the presence of acidic groundwater.
It is found associated with Coronadite, fluorite, goethite, opal, pyromorphite, quartz, wulfenite (Blue Bell claims); coronadite, lithiophorite, crocoite (Red Lead mine).
The mineral was named to honor Robert E. Reynolds (b. 1943), former Curator of Earth Sciences at the San Bernardino County Museum, Redlands, California, USA.