Mineral, Specifically A Detrital Grain

Chert (specifically Red Chert/Jasper)

Microcrystalline Quartz (SiO2)

Chert (specifically Black Chert / Flint)

Silicon Dioxide (SiO2)

Chert (specifically Zebra Chert/Flint)

Silicon Dioxide (SiO2)

Chert (specifically Flint or Dark Chert)

Chert (SiO2)

Chert (specifically Blue Chert/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite with Garnet

Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Greenstone

Greenschist / Meta-basalt

Basalt with Quartz Veining

Amygdaloidal Basalt (predominately SiO2 and (Na,Ca)(Si,Al)4O8)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

Puddingstone (Jasper-Conglomerate)

Conglomerate (Silicon Dioxide, SiO2 with impurities)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock)

Chert Pebble (Jasper variant)

Microcrystalline Quartz (SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Sandstone

Arenite (composed primarily of SiO2)

Basalt

Extrusive mafic igneous rock

Basalt with Scoria/Vesicular Texture

Vesicular Basalt (Iron-rich/Oxidized)

Quartzite (River Pebble)

Metamorphosed sandstone (SiO2)

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Sedimentary Breccia

Clastic Breccia (CaCO3/SiO2 matrix)

Granodiorite

Granodiorite (Quartz-Feldspar-Biotite Plutonic Rock)

Granite

Granite (Felsic Plutonic Rock)

Gold Flake

Native Gold (Au)

Quartzite Pebble (River Rock)

Quartzite (SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Bauxite / Iron-rich Laterite

Laterite (principally Al(OH)3, Fe2O3, and SiO2)

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Diorite (River Pebble)

Diorite (Intermediate intrusive igneous rock)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Desert Rose

Gypsum (CaSO4·2H2O) or Barite (BaSO4) inclusions in sand

Granite

Granite (phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Basalt (Weathered/River worn)

Mafic Volcanic Rock (Primarily Plagioclase Feldspar and Pyroxene)

Riverstone Quartzite (Water-worn Siltstone/Quartzite)

Metamorphosed Quartz-rich Arenite (SiO2)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Vesicular Basalt

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

Granite

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)