Mineral, Often A Rock Given Its Aggregate Nature

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (Micaceous)

Arenite (composed primarily of SiO2)

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Sandstone (Quartzite-rich River Cobble)

Clastic sedimentary rock (primarily SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic Quartz-Feldspar Igneous Rock)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Limonite Concretion (Ironstone)

Limonite / Goethite (FeO(OH)·nH2O)

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Sandstone

Arenite (primarily SiO2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Magnetite

Magnetite (Fe3O4)

Serpentine (Nephrite-like River Cobble)

Serpentinite (Hydrous Magnesium Iron Silicate)

Turquoise

Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Desert Rose (Baryte or Selenite variant)

Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Sandstone (River Pebble)

Arenite (SiO2 based)

Sandstone (Quartz Arenite)

Clastic Sedimentary Rock - Quartz Arenite

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

Quartz Veined Rock (Likely Graywacke or Quartzite)

Silicon Dioxide (SiO2) veins in Metasedimentary matrix

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Pink Granite

Granite (Phaneritic intrusive igneous rock dominated by Quartz and K-Feldspar)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Sandstone (specifically Picture Sandstone or Wonderstone)

Arenite (composed primarily of SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Blue Lace Agate (Heat-treated/Crackle Quartz variety)

Silicon Dioxide (SiO2)

Basalt (Vesicular)

Basalt (Mafic Extrusive Igneous Rock)

Basalt

Basalt (composition of plagioclase, pyroxene, and olivine)

Chert (varietal: Flint/Jasper mix)

Hydrous Silica (SiO2)

Banded Chalcedony (Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Serpentinite

Serpentinite (composed primarily of mineral group (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (high iron oxide content)

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Oolite (Ooids)

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Basalt with Iron Oxidation

Mafic Igneous Rock (Basalt)