This Is Not A Rock Or Mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Flower Agate

Chalcedony (SiO2) with Platy inclusions

Dendritic Agate

Dendritic Agate (Silicon Dioxide with Manganese or Iron Oxide inclusions, SiO2)

Black Onyx

Silicon Dioxide (SiO2) with parallel banding

Quartzite

Quartzite (primarily SiO2)

Basalt (River Cobble)

Mafic Igneous Basalt (composed primarily of Plagioclase feldspar, Pyroxene, and Olivine)

Basalt with Quartz Veining

Basalt (Mafic Volcanic Rock) with Silicon Dioxide (SiO2) inclusions

Orbicular Granite

Orbicular Granidiorite / Plutonic Igneous Rock

Quartz with inclusions

Silicon Dioxide (SiO2)

Pink Granite

Granite (Felsic intrusive igneous rock)

Chert (Septarian Concretion/Nodule)

Microcrystalline silica (SiO2) with carbonate mineral veining

Schist

Chlorite/Mica Schist

Sandstone (Quartzose Sandstone)

Arenite (SiO2)

Schist (Biotite Schist)

Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Galena

Lead(II) sulfide (PbS)

Marble

Recrystallized Carbonate Rock (CaCO3)

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)

Quartzite (with Quartz Veining)

Quartzite (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar rock)

Ferruginous Sandstone (Gritstone)

Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))

Ferruginous Sandstone

Sandstone with Iron Oxide (Limonite/Goethite)

Gneiss

Gneiss (High-grade metamorphic rock)

Porphyritic Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Red Jasper (Brecciated Jasper)

SiO2 (Silicon Dioxide) with Ferric Iron inclusions

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Sandstone Concretion

Moqui Marble / Iron-oxide Concretion (SiO2 with Hematite/Goethite)

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Sodalite

Sodalite [Na8(Al6Si6O24)Cl2]

Sandstone Cobble

Arenite (Secondary classification based on grain size)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt

Basalt (principally Plagioclase Feldspar and Pyroxene)

Raw Diamond (Rough Uncut)

Diamond (C - pure carbon)

Sandstone

Arenite (SiO2 based)

Granodiorite (foreground) and Rose Quartz (background)

Granodiorite / Quartz (SiO2)

Granatic Pegmatite

Pegmatitic Granite

Gneiss

High-grade Metamorphic Gneiss