Identify any rockfrom a photo.

Ruby-in-Fuchsite cabochon/tower

Corundum (ruby, Al₂O₃) in fuchsite-bearing mica schist; commonly with chromite and quartz

Likely weathered gneiss

Banded quartz–feldspar–mica gneiss

Chert

Silicon dioxide (SiO2)

Blue-gray quartz-rich rock, likely sodalite-bearing syenite or granite

Probable sodalite-bearing nepheline syenite; composition may include quartz, feldspar, sodalite, and dark mafic minerals

Gold-bearing quartz sulfide specimen

Native gold (Au) with quartz (SiO₂), likely associated with iron sulfides such as pyrite

Azurite–malachite specimen (likely azurite-rich copper ore)

Azurite, Cu₃(CO₃)₂(OH)₂, commonly intergrown with malachite, Cu₂CO₃(OH)₂, and limonite/quartz matrix

Blue-gray chalcedony (likely agate/jasper fragment)

Microcrystalline quartz, SiO₂ (chalcedony)

Weathered sandstone

Quartz-rich sandstone, likely ferruginous subarkose

Quartz-rich sandstone

Sandstone, composed mainly of quartz (SiO₂) with iron-oxide cement

Coral fossil (likely fossilized reef coral)

Calcitic coral; commonly fossilized Scleractinia or related colonial coral

Serpentine-rich altered rock

Serpentinite, likely with chlorite and magnetite; exact identification requires testing

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony with iron-oxide and other mineral inclusions; SiO₂