Sedimentary Rock (Possibly Composed Of Various Minerals)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Conglomerate (River Rock)

Clastic sedimentary rock (primarily SiO2)

Sandstone

Sandstone (lithified quartz arenite, arkose, graywacke, etc. depending on composition)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Sandstone

Arenite (SiO2 based)

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Gneiss

Gneissic Metamorphic Rock

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Quartz

Quartz (SiO₂)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Sandstone

Clastic Sedimentary Rock (composed mostly of SiO2)

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Rose Quartz

Rose Quartz (SiO₂)

Quartz Geode (with Agate banding)

Silicon Dioxide (SiO2)

Bivalve Shell (Fossil or Contemporary)

Class Bivalvie (various genera and species of clams, cockles, etc.)

Red Sandstone

Arenite (with Iron Oxide)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Lapis Lazuli (polished cabochon/sphere)

Na8[Al6Si6O24]Sn with accessory minerals (Pyrite, Calcite)

Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)

Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)

Sandstone

Arenite (primarily SiO2)

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Sandstone (likely Quartzose Sandstone pebble)

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Unakite

Epidotized Granite

Ferruginous Sandstone (Ironstone)

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Shale

Fissile Mudstone (primarily composed of clay minerals and quartz)

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)

Mixed Tumbled Stones Collection

Mixed Silicates and Carbonates (Quartz, Amorphous Silica, Carbonates)

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Sandstone

Arenite (Sedimentary rock composed of sand-sized minerals or rock grains)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Lapis Lazuli

Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Sandstone

Arenite (primarily SiO2)

Greenschist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Sandstone

Arenite (general term for sandstone)

Sandstone

Arenite (SiO2 primarily)

Granite

Granite (Phaneritic intrusive igneous rock)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 predominantly)