Synthetic (Not A Rock Or Mineral)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Geode

Quartz nodule / Chalcedony-lined cavity

Quartz-rich geode or mineralized cavity in host rock

Likely a quartz-bearing geode; the pale crystals may be quartz (SiO₂), but the photo is not detailed enough for a firm identification.

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

River Rock / Stream Pebble

Fluvial Clast / Rounded Sedimentary Particle

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Sandstone with Iron Banding

Arenite with Hematite or Limonite staining (SiO2 with Fe2O3)

Rutilated Quartz

SiO2 with TiO2 inclusions (Rutile)

Quartz Geode

Silicon Dioxide (SiO2)

Blue Tiger's Eye

Riebeckite (crocidolite variety)

Likely weathered granite or granitic gneiss

Granite: quartz + feldspar + mica; possibly gneiss if the faint texture reflects foliation

Agate Geode

Silicon Dioxide (SiO2) - Chalcedony variety

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Yellow Agate (Banded Chalcedony)

Silicon Dioxide (SiO2)

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Weathered iron-rich rock, possibly limonite-bearing basalt or laterite

Indeterminate; likely Fe-oxide/hydroxide–altered mafic rock, dominated by limonite/goethite with silicate minerals

Aquamarine

Aquamarine (Beryl variety); Be3Al2Si6O18

Weathered volcanic rock, likely andesite or basaltic-andesite

Fine-grained plagioclase–pyroxene volcanic rock; possible altered andesite (exact identification requires testing)

Vuggy Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Quartz Geode

Silicon dioxide (SiO2)

Sandstone with Manganese Dendrites

Clastic Sedimentary Rock (SiO2 based with MnO2 inclusions)

Likely blue-gray gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be confirmed from the image

Copper Ore (Malachite and Azurite stained rock)

Copper-bearing rock with secondary copper carbonates

Mixed Rock and Mineral Collection

Various geological specimens

Abbey Bominable (Monster High character)

Anthropomorphic Yeti / Digital Animation

Sandstone

Arenite (SiO2 dominant)

Quartz (Clear/Smoky Geode fragment)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Unidentified dark mineral/rock fragment

Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Quartz Geode

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Quartzite (mostly SiO2)

Milky Quartz with Chlorite Schist Inclusions

Quartz (SiO2) with Chlorite Group silicates (typically (Mg,Fe)3(Si,Al)4O10(OH)2)

Likely bituminous coal

Coal, predominantly carbon-rich organic matter; exact rank cannot be confirmed from the image

Geode

Quartz / Chalcedony nodule

Pebble

Clast (specifically a granule or small pebble)

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Xenolith in Basalt

Mafic Igneous Rock with Felsic Inclusion

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss