Demitasse Granite (Diorite-Granite transition)
Intermediate Plutonic Rock (Granodiorite/Diorite mix)
igneous
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Gneiss (Green Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Granite
Phaneritic Felsic Intrusive Rock
igneous
Sandstone (Quartz-rich)
Arenite (Quartz Arenite)
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Greywacke with Quartz Vein
Greywacke (immature sandstone) with SiO2 inclusions
sedimentary
Schist
Mica Schist
metamorphic
Bauxite
Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)
sedimentary
Milky Quartz in Gneiss
Quartzite / Foliated Gneiss containing SiO2
metamorphic
Shale
Fissile mudstone (primarily clay minerals and silt-sized quartz)
sedimentary
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Sandstone Concretion
Clastic Sedimentary Concretion (SiO2 with Iron Oxide)
sedimentary
Lapis Lazuli
Complex mixture of minerals (lazurite, calcite, pyrite, and sodalite); (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Sapphire (Corundum)
Corundum (Al2O3)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Carnelian (Chalcedony)
Cryptocrystalline Quartz (SiO2) with Iron Oxide impurities
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Milk Quartz (with Iron staining)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Basalt with Quartz Veins
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic volcanic rock with secondary mineral fillings)
igneous
Granite
Granite
igneous
Weathered Basalt with Iron Staining
Mafic Igneous Rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Blue Sapphire Crystal (Rough)
Corundum (Aluminum Oxide, Al2O3)
mineral
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Breccia
Breccia (Clastic Sedimentary Rock)
sedimentary
Sandstone (Stream Pebble)
Arenite (primarily SiO2)
sedimentary
Milky Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Granite River Cobble
Phaneritic Felsic Igneous Rock
igneous
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)
sedimentary