Identify any rockfrom a photo.

Small metallic-looking mineral/rock fragment

Indeterminate from image; possible pyrite-bearing sulfide rock or native-metal/meteorite fragment

Native gold specimen

Native gold (Au), likely with quartz or sulfide matrix

Native gold nugget or flake

Native gold (Au), possibly with minor silver/electrum

Pyrite (likely a small gold-bearing pyrite specimen)

Pyrite, iron disulfide (FeS₂)

Unidentified metallic mineral or meteorite fragment

Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment

Likely weathered quartz-rich rock fragment

Indeterminate; possibly quartz-bearing sandstone or chert with iron-oxide staining

Weathered feldspar-rich rock, likely granite fragment

Granite or feldspar-rich pegmatitic rock; mainly potassium feldspar (orthoclase/microcline), quartz, and minor mica

Tan quartz-rich rock, likely sandstone or weathered quartzite

Quartz sandstone; primarily SiO₂ with possible feldspar and iron-oxide cement

Orange calcite (likely)

Calcite, calcium carbonate (CaCO₃)

Rounded basalt cobble

Basalt, aphanitic mafic volcanic rock; commonly plagioclase + clinopyroxene ± olivine and iron-titanium oxides

Weathered vesicular basalt (likely amygdaloidal basalt)

Basalt; chiefly plagioclase, pyroxene, and minor olivine/iron oxides, with possible secondary zeolite or calcite fillings

Raw dark metallic mineral specimen, possibly native gold-bearing quartz or sulfide ore

Uncertain from image; possible pyrite/chalcopyrite-bearing quartz or gold-bearing sulfide matrix