Mineral Like Byproduct (Often Mistaken For Igneous Rock Or Meteorite)

Sandstone (with minor quartz and possible clay components)

Clastic Sedimentary Rock (SiO2 dominated)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Vesicular Basalt (Pumice-like)

Vesicular Basalt

Conglomerate (River Rock Aggregate)

Conglomerate (Lithic-clast conglomerate)

Basalt with Weathered Rind

Basalt (Aphanitic Mafic Igneous Rock)

Scoria (often called Lava Rock)

Vesicular Basalt / Scoria

Chert Nodule

Microcrystalline Silica (SiO2)

Sandstone (Red)

Arenite (primarily SiO2 with Iron Oxide staining)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Granite Cobble/Pebble

Granite

Quartz (Smoky or Clear variety with inclusions)

Silicon Dioxide (SiO2)

Porphyritic Rhyolite (Red Porphyry)

Porphyritic Rhyolite (Felsic volcanic rock)

Serpentinite (often containing Jadeite/Nephrite)

Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4

Sunstone

Oligoclase (a variety of Plagioclase Feldspar) - (Na,Ca)(Si,Al)4O8

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Undetermined Due to Blur (Possible Flesh-Tone Mineral)

Unknown (Insufficient Visual Clarity)

Epidote (Unakite-related)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Coarse-grained Granite (Quartz and Feldspar dominated)

Granitoid (KAlSi3O8 – NaAlSi3O3 – CaAl2Si2O8 – SiO2)

Granite

Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Granitic Pegmatite (River Rock specimen)

Granite / Pegmatite (composed of SiO2, KAlSi3O8, and NaAlSi3O8)

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Shale

Fissile Siliciclastic Sedimentary Rock

Petrified Wood

Silicified wood (primarily SiO2)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Quartz Veined Basalt Pebble

Amygdaloidal Basalt with Quartz (SiO2) veining

Basalt

Mafic Volcanic Rock (composed mainly of Plagioclase, Pyroxene, and Olivine)

Obsidian

Obsidian (volcanic glass; primarily SiO2)

Granite

Phaneritic Igneous Rock (Granitic)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Rhyolite

Rhyolite (Extrusive Felsic Igneous Rock)

Red Sandstone (Arkose)

Clastic Sedimentary Rock (Lithic Arkose)

Thunderegg (specifically a Jasper/Agate-filled Geode nodule)

Silicon Dioxide (SiO2) within Rhyolitic Matrix

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Vesicular Basalt

Basalt with secondary mineral infilling (Amygdaloidal Basalt)

Ruby in Zoisite

Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende