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

Quartz (Gravel Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz River Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Porphyritic Basalt (Chinese Writing Stone)

Porphyritic Basalt with Feldspar Phenocrysts

Granite

Phaneritic Felsic Igneous Rock (Granite)

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8

Basalt with Quartz/Feldspar Inclusion

Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)

Porphyritic Basalt (with Augite Crystals)

Porphyritic Mafic Volcanic Rock (Fe-Mg Silicates)

Blue Chalcedony

Silicon Dioxide (SiO2)

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Basalt

Basalt (Phaneritic/Aphanitic Mafic Igneous Rock)

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Sandstone

Arenite (primarily Quartz, SiO2)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

Gneiss (High-grade Metamorphic Rock)

Gneiss (Metamorphic silicate rock)

Basalt

Basalt (Aphanitic mafic volcanic rock)

Obsidian

Volcanic Glass (predominantly SiO2)

Quartz

Silicon Dioxide (SiO2)

Unidentified Rock Fragment

Unknown

Chert (Septarian or Nodular variety)

Microcrystalline Quartz (SiO2)

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Pegmatite (Granite Pegmatite)

Intrusive Igneous Rock (Granite Pegmatite)

Quartz Geode

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt River Cobble

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt with Epidote Veining

Basalt (Mafic Extrusive Rock) with Ca2(Al,Fe)3(SiO4)3(OH)

Basalt with Quartz/Feldspar Inclusions

Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining

Jasper

Jasper / Silicon Dioxide (SiO₂)

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Citrine

Silicon Dioxide (SiO2)

Citrine Geode Fragment

Citrine (Silicon Dioxide with Iron Impurities), SiO2

Gneiss (Cobble)

Gneiss

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Vesicular Basalt

Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 (Pyroxene) and (Ca,Na)Al(Al,Si)Si2O8 (Plagioclase Feldspar)

Epidote (Unakite variety)

Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))

Sandstone

Arenite (Clastic Sedimentary Rock)

Quartz (River Pebble)

Silicon Dioxide (SiO2)