Sedimentary Rock (Possibly Composed Of Various Minerals)

Basalt

Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)

Quartz Pebbles

Silicon Dioxide (SiO2)

Likely quartz-rich metamorphic rock (quartzite or milky quartz)

Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining

Orange Calcite

Calcium Carbonate (CaCO3)

Red Sandstone

Ferruginous Sandstone (SiO2 dominated with Fe2O3 cement)

Lapis Lazuli

Rock composed mainly of lazurite, calcite, and pyrite

Sulfur

Sulfur (S8)

Chert (potentially Flint or Mudstone)

Microcrystalline Quartz (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Likely milky quartz fragment

Quartz (silicon dioxide, SiO₂), possibly with iron-oxide or mica inclusions

Iron Ore / Hematite Rock

Iron oxide (primarily Hematite, Fe2O3)

Brown Pebble (River Rock)

Indeterminate (Likely Silicon Dioxide / Quartz-rich)

Milky Quartz

Silicon Dioxide (SiO2)

Red Siltstone

Siltstone (composed mainly of SiO2 and Fe2O3)

Sandstone

Arenite

Cat's Eye Moonstone (Simulated/Synthetic or natural Cat's Eye Quartz/Glass)

There is no single scientific name. The appearance suggests either: Moonstone (feldspar group), Cat's Eye Quartz (SiO2), Apatite (Ca5(PO4)3(F,Cl,OH)), or most likely a synthetic material such as Fiber Optic Glass or 'Opalite' (a type of glass).

Sandstone (with Arkose characteristics)

Clastic sedimentary rock (SiO2 with KAlSi3O8)

Travertine

Travertine (a terrestrial form of Limestone, CaCO3)

Schist

Mica Schist (Medium-grade metamorphic rock)

Weathered granite or granitic gneiss

Granite; mainly quartz (SiO₂), feldspar, and mica, possibly with metamorphic foliation

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony (SiO2), Picture Jasper (SiO2)

Blue Apatite

Ca5(PO4)3(F,Cl,OH)

Schist

Mica Schist

Sandstone (Banded)

Clastic Sedimentary Rock (composed of SiO2, CaCO3, or Fe2O3 cement)

Puddingstone

Conglomerate

Jasper (Petrified Wood variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Schist

Schist (various mineral compositions)

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly mica-bearing

Manganese Dendrite on Siltstone

Manganese Oxide (pyrolusite or psilomelane) Dendrites

Basalt with Iron Oxidation

Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)

Limestone with Iron Oxide Staining

Sedimentary Rock (Calcite, CaCO3)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)

Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates

Aventurine

Silicon Dioxide (SiO2) with inclusions

Hematite Nodular Iron Ore

Hematite (Fe2O3)

Sandstone

Arenite (compositionally various, primarily SiO2)

Likely weathered quartz-bearing rock fragment

Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite

Sandstone (Red / Iron-stained)

Sandstone (composed predominantly of SiO2 with Fe2O3 cement)

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.