Galena
PbS — cubic habit, lead-gray streakMuted metal on near-black felt. Lead-gray luster and dull brass are the only bright elements in the drawer — every chunk lifted off its compartment, labelled, nothing saturated, nothing glossed.
Pyrite
FeS₂ — brassy cubes, fool's goldHardness6.0–6.5
LusterMetallic
LocalityLeadville
Sphalerite
ZnS — resinous grey, brown streakHardness3.5–4.0
LusterResinous
LocalityJoplin
Reference Set
Riker mount · felt-on-pasteboardDrawer12 / 48
GroundNear-black felt
CatalogAssay grade
Locality
Typed label · brass-pinnedDistrictSan Juan Mts.
Collected1924
Graded byAssay Office