Identify any rockfrom a photo.

Weathered quartz-rich rock, likely granite or gneiss

Indeterminate granitic rock; mainly quartz, feldspar, and mica

Coarse-grained granite or granitic gneiss

Granite; mainly quartz, feldspar, and mica (possibly foliated orthogneiss)

Weathered granite or granitic gneiss

Granite–gneiss, composed mainly of quartz, feldspar, and mica

Weathered vesicular volcanic rock

Likely vesicular basalt or scoriaceous andesite; exact identification requires a fresh surface and tests

Weathered iron-rich rock fragments

Likely limonite/goethite-stained basalt or ironstone; exact identification requires testing

Likely weathered limestone or calcitic marble

Calcite-rich carbonate rock; chiefly calcium carbonate, CaCO₃

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica (possibly metamorphosed to gneiss)

Likely pegmatitic granite or quartz-rich metamorphic rock

Granite/pegmatite, primarily quartz, feldspar, and mica

Weathered granite or granitic gneiss

Granite–gneiss; chiefly quartz, feldspar, and mica

Aquamarine (blue beryl)

Beryl, Be₃Al₂Si₆O₁₈; blue variety colored mainly by iron

Garnet fragments

Garnet-group silicate, most likely almandine–pyrope or spessartine; composition varies, commonly (Fe,Mg,Mn)₃Al₂Si₃O₁₂

Blue-green glassy mineral specimen, likely turquoise-colored fluorite or dyed material

Uncertain; possible fluorite (CaF₂), chrysocolla, or dyed calcite/glass