Igneous And Metamorphic Derivative (Weathered)

Milky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Smoky Quartz

Smoky Quartz (SiO2 - Silicon Dioxide with trace impurities of aluminum)

Milky Quartz (with trace inclusions)

Silicon Dioxide (SiO2)

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Smoky Quartz (Rough Specimen)

Silicon Dioxide (SiO2)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

White Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz (Granular Milky Quartz fragment)

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine or Quartzite Pebble)

Silicon Dioxide (SiO2)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Veined Quartz

SiO2 (Silicon Dioxide)

Green Aventurine and Clear Quartz

Aventurine (variety of Quartz - SiO2) and Quartz (SiO2)

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony (Agate/Carnelian precursor)

Chalcedony (Silicon Dioxide, SiO2)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Rough Corundum (likely Sapphire or Common Corundum)

Aluminum oxide (Al2O3)

Granite (weathered pebble)

Granite (plutonic igneous rock)

Granite Cobble

Phaneritic Felsic Igneous Rock (Granite)

Granodiorite (River Rock / Cobble)

Granodiorite; Phaneritic intrusive igneous rock dominated by plagioclase, quartz, and hornblende/biotite

Granite Pebble

Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)

Vesicular Basalt (or Scoraceous Basalt)

Basalt with vesicular texture

Wishing Stone with Quartz Vein

Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)

River Cobble (likely Quartzite or Limestone)

SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)

Basalt (with possible mineral veining)

Basalt (Aphanitic Mafic Igneous Rock)

Iron Meteorite (likely Chondrite or weathered Iron-Nickel)

Meteorite (Fe-Ni alloy & silicates)

Basalt with Plagioclase Feldspar

Basalt (mafic extrusive igneous rock) with plagioclase feldspar phenocrysts

Basalt

Basalt (Mafic volcanic rock)

Vesicular Basalt with Lichen

Vesicular Basalt

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock

Lunar Meteorite (Feldspathic Breccia)

Lunar Achondrite (Regolith Breccia)

Yellow Quartz (Citrine Quartz)

Silicon Dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Quartzite (or Milky Quartz pebble)

Quartzite (primarily Silicon Dioxide, SiO2)

Golden Quartz (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Basalt Pebble

Extrusive mafic igneous rock

Granite Cobble

Phaneritic Felsic Igneous Rock

River Rocks (Basalt and Sedimentary Stones)

Mafic Igneous Rock (Basalt) and Clastic Sedimentary Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)