Identify any rockfrom a photo.

Weathered sulfide-bearing metamorphic rock, possibly pyrite-rich schist

Quartz–mica schist with iron sulfides (likely pyrite, FeS₂); exact identification requires testing

Likely weathered jasper or iron-rich chert

Microcrystalline quartz (SiO₂), with iron-oxide staining

Dark fine-grained rock fragment

Probably basalt or basaltic scoria; visual identification is uncertain

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with possible iron-oxide and mica impurities

Biotite schist (mica-rich metamorphic rock)

Mica schist, chiefly quartz, feldspar, and biotite mica

Gold-bearing quartz vein rock

Quartz (SiO₂) with probable native gold and iron-oxide/sulfide minerals

Likely golden mica-bearing metamorphic rock

Micaceous schist, possibly biotite schist; composition commonly quartz + feldspar + biotite/phlogopite mica

Weathered sandstone or conglomeratic sandstone

Clastic sedimentary rock, chiefly quartz and feldspar grains cemented by iron oxides and silica/calcite

Likely raw amber-bearing rock or amber-like resin

Amber (fossilized plant resin), chiefly polymerized terpenoid compounds; exact identification is uncertain from the image

Iron-stained quartz-rich rock, possibly limonite-bearing quartzite

Quartz (SiO₂) with iron oxides/hydroxides, chiefly hematite and goethite

Biotite schist (probable)

Mica schist; chiefly quartz, feldspar, and biotite mica

Mixed sedimentary rock and mineral specimens

Predominantly limestone, chert, sandstone, and iron-oxide-bearing clasts; exact identification requires testing