Synthetic (Not A Rock Or Mineral)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Biotite (Black Mica)

Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]

Druzy Quartz on Agate/Chert

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock)

Garnet in Matrix (likely Almandine in Quartz/Mica Schist)

Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock

Diorite (River Cobble)

Intermediate plutonic igneous rock

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)

Schist

Mica Schist

Iron-stained Milky Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Chalcedony Nodule (Commonly known as Agate or Chert)

Microcrystalline Quartz (SiO2)

Sandstone Geode (Unbroken)

Siliciclastic sedimentary rock (primarily Quartz)

Basalt

Mafic Igneous Rock

Amygdaloidal Basalt

Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Diorite (Spotted or Dalmatian Stone pattern)

Diorite

Basalt (Weathered Pebble)

Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene

Garnet-Bearing Schist

Almandine Garnet Micaceous Schist

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Dalmatian Jasper

Peralkaline rhyolite

Sandstone (likely Iron-rich or Arkosic)

Arenite (SiO2 with FeO(OH) or Fe2O3 staining)

Sandstone Concretion

Clastic Sedimentary Rock (primarily SiO2 with mineral cement)

Druzy Quartz

Silicon Dioxide (SiO2)

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Granite

Granite (Felsic Plutonic Rock)

Ferruginous Sandstone

Ferruginous Clastic Sedimentary Rock

Olivine Basalt

Mafic Volcanic Rock (rich in (Mg, Fe)2SiO4)

Wishing Stone (Quartz-veined Siltstone or Graywacke)

Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)

Coarse-grained Granite

Phaneritic Granite (contains Quartz, Feldspar, and Mica)

Clear Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Copper-bearing Quartz (with Malachite and Iron Oxides)

Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)

Basalt with Plagioclase Phenocrysts (Porphyritic Basalt)

Porphyritic Basalt (Mafic volcanic rock)

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Basalt with Amygdaloidal Inclusions

Aphanitic Mafic Volcanic Rock (Basalt)

Amethyst on Agate/Basalt Matrix

Silicon Dioxide (SiO2) with iron impurities

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions