Mineral, Often A Rock Given Its Aggregate Nature

Porphyritic Basalt (with Pyrolusite or Iron-oxide staining)

Porphyritic Basalt (Mafic Extrusive)

Gold Flake / Placer Gold

Native Gold (Au)

Conglomerate

Conglomerate (Detrital sedimentary rock)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Rose Quartz

Rose Quartz (SiO2)

Sodalite

Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)

White Quartz Pebble (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Sandstone

Arenite (SiO2 based)

Basalt with Calcite Veining

Aphanitic Mafic Igneous Rock (Basalt) with CaCO3

Chert / Flint Nodules in Sandstone

Microcrystalline Quartz (SiO2) within Clastic Sedimentary Rock

Granite Cobble

Plutonic Igneous Rock (Granitic)

Vesicular Basalt with Secondary Mineral Infill

Mafic Volcanic Rock (Basalt)

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)

Brown Sandstone

Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)

Sandstone

Arenite (SiO2 based with quartz, feldspar, or lithic fragments)

Basalt River Stone

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Jasper (Mookaite style)

Jasper (Silica-rich Microcrystalline Quartz, SiO2)

Sandstone with Liesegang Rings

Arenite with Iron Oxide Concretions

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Scoria (Lava Rock)

Scoria (Mafic Volcanic Rock)

Biotite Schist

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

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone (Glacial Cobble)

Arenite / Sedimentary Rock (primarily SiO2)

Basalt

Mafic Volcanic Basalt (Major minerals: Plagioclase feldspar, Pyroxene; Minor: Olivine, Magnetite)

Conglomerate

Conglomerate (clastic sedimentary rock)

Basalt

Mafic Igneous Rock (composed of plagioclase feldspar and pyroxene)

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Quartz / Common Opal

Silicon Dioxide (SiO2)

Gneiss (with Quartz and Mica)

Gneiss

Polychrome Jasper

Silicon Dioxide (SiO2) with iron and other mineral inclusions

Vesicular Basalt

Extrusive Mafic Igneous Rock (composed of Plagioclase feldspar, Pyroxene, and Olivine)

Ferruginous Sandstone (with possible Epidote/Chlorite coloring)

Sandstone (SiO2 dominated with Fe2O3 staining)

Andesite

Andesite (Intermediate Extrusive Volcanic Rock)

Sandstone (Quartzose)

Arenite (composed mainly of SiO2)

Limestone (with Iron-Oxide staining)

Sedimentary Calcium Carbonate (CaCO3)

Gneiss (Pebble)

Gneiss

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide