Iron-stained Quartzite
Metamorphic Quartz (SiO2) with limonite/hematite staining
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Amber with Organic Inclusions
Succinite (fossilized resin)
mineraloid
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Chert (Flint Nodules)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite (specifically an iron-stained or Carnelian-colored variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Marble
Recrystallized Calcite (CaCO3) Rock
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Chert (Flint) Nodule
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (mainly SiO2)
metamorphic
Vesicular Basalt
Basalt with vesicular texture
igneous
Smoky Quartz (with inclusions)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Riverstone Quartzite / Chalcedony Nugget
Silicon Dioxide (SiO2)
metamorphic
Strawberry Quartz (Hematoid Quartz)
Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)
mineral
Rose Quartz
Silicon dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Amber
Succinite
Organic mineraloid
Basalt
Mafic extrusive igneous rock
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt with Amygdules
Amygdaloidal Basalt
igneous
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Fossiliferous Shale Matrix
Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments
sedimentary
Chert (Honey Chert / Flint)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Red Mudstone (Siltstone)
Lutite (primarily Quartz and Clay minerals with Hematite)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper variation)
Chert (SiO2)
sedimentary
Anthracite Coal
Anthracite (Metamorphosed Coal)
sedimentary
Limestone (specifically Dolomitic Limestone)
Calcium Magnesium Carbonate (CaMg(CO3)2)
sedimentary
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Conglomerate
Conglomerate (Detrital sedimentary rock)
sedimentary
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Limonite with Iron Inclusions
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxides)
sedimentary
Schist
Mica Schist
metamorphic