Synthetic Material (Not A Rock Or Mineral)

Sandstone

Arenite

Sandstone

Arenite (SiO2 primarily)

Biotite Schist

Biotite Schist (Rich in K(Mg,Fe)3AlSi3O10(OH)2)

Sandstone (Quartzose)

Sandstone (composed primarily of Quartz: SiO2)

Blue-gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica assemblage; exact identification requires testing

Granite (likely weathered quartz-bearing granite)

Granite; primarily quartz, feldspar, and mica/amphibole

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Sandstone (Quartzose Sandstone)

Arenite (SiO2 principal component)

Chalcedony (likely iron-stained agate)

Microcrystalline quartz, SiO₂ (chalcedony/agate)

Jasper

Silicon dioxide (SiO2) with impurities

Note regarding image quality

Quartz Pebble

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Fossiliferous Sandstone / Fossil Fragment

Fossiliferous Sedimentary Matrix with Indeterminate Fossil Material

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Blue Topaz (specifically London Blue or Swiss Blue based on color saturation)

Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)

Shale

Argillaceous Sedimentary Rock

Epidotite (Unakite-related Epidote)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Mudstone

Argillite / Siliciclastic sedimentary rock

Granite Pebble

Intrusive Igneous Rock (Felsic to Intermediate)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate rock

Sandstone with Manganese Oxide Patina

Clastic Sedimentary Rock (primarily SiO2)

Tektite

Natural impact glass

Conglomerate

Conglomerate Rock

Sandstone

Sandstone (clastic sedimentary rock)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (composed mostly of SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Granite

Phaneritic Igneous Rock (Granite)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 cement)

Sandstone

Arenite (composed primarily of SiO2)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Sandstone with Ironstone Concretion

Arenite with Ferruginous Cement

Mixed rock and mineral collection

Multiple specimens; visible pieces may include quartz, calcite, agate/chalcedony, jasper, and dyed or coated materials

Carnelian (Polished Agate/Jasper)

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Banded Sandstone

Arenite (Sandstone with iron oxide banding)