Mineral Side Rock

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Granite fragment

Granite (Felsic intrusive igneous rock)

Sandstone with Iron Staining

Arenite (SiO2 with Fe2O3)

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Sandstone

Quartz Arenite / Sedimentary Rock

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone

Sedimentary Rock (Quartz arenite or arkose)

Quartz Geode

Quartz (Silicon Dioxide, SiO2) in a Geode

Quartz Druzy

Silicon Dioxide (SiO2)

Shale

Sedimentary pelitic rock

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Tektite

Impactite (Natural Silicate Glass)

Red Sandstone

Arenite (Ferruginous Sandstone)

Unidentified small mineral fragments

Likely quartz- or feldspar-rich material; species cannot be determined reliably from the image

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Quartz Vein in Sedimentary Rock

Silicon Dioxide (SiO2) with host Chert or Limestone

Sandstone

Arenite (SiO2 primarily)

Basalt with Quartz Vein

Mafic Igneous Rock (SiO2 filling)

Sandstone

Arenite

Sandstone

Arenite (SiO2 dominant)

Sandstone

Arenite

Banded Igneous Dike Rock

Intrusive igneous rock with felsic/mafic banding

Pebble (likely a type of sandstone or quartzite pebble)

Clastic Sediment (specifically, a rudite-sized clast). If the pebble is composed of a specific rock type, its scientific name would be that rock type (e.g., 'Quartzite pebble', 'Granite pebble', 'Chert pebble'). Given its appearance, it is likely a metamorphic quartzite pebble or a hard sandstone pebble.

Dendritic sandstone

Sandstone with Manganese Oxide dendrites

Sandstone with Quartz/Calcite druse

Arenite with druse (SiO2 or CaCO3)

Sandstone

Clastic sedimentary rock (Quartz arenite)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Red Sandstone Pebble

Quartzose Sandstone

Sedimentary Sandstone

Arenite (Sedimentary Rock)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Tumbled Stone

Silicon dioxide / Various silicates

Quartz-veined Metamorphic Rock

Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)

Banded River Rock with Quartz Vein

Siltstone/Greywacke with Quartz (SiO2)

Sandstone

Arenite

Granite fragment

Granite; mainly quartz (SiO₂), feldspar, and mica

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Concretion

Sedimentary Concretion

Note: Item is not a geological specimen

Homo sapiens (Dermal Appendage: Pilus)