Pyrite

Iron Sulfide (FeS2)

mineral

Rose Quartz

Silicon dioxide (SiO2) with trace impurities of titanium, iron, or manganese

mineral

Dendritic Agate

Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions

mineral

River Rock (Basalt/Greywacke)

Aphanitic Basalt or Lithic Sandstone (Greywacke)

igneous

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with Iron Oxide cement)

sedimentary

Basalt

Basalt (comprising plagioclase, pyroxene, and olivine)

igneous

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

sedimentary

Sandstone Pebble

Arenite (primarily SiO2)

sedimentary

Scoria (Red Lava Rock)

Scoria

igneous

Scoria (Lava Rock)

Scoria

igneous

Scoria (Red Lava Rock)

Scoria

igneous

Scoria (Red Lava Rock)

Scoria

igneous

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Quartzite Pebble

Metamorphic Quartzite (SiO2)

metamorphic

Moonstone (Green Moonstone / Garnierite)

Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite

mineral

Smoky Quartz (Polished)

Silicon Dioxide (SiO2)

mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Gneiss (Granitic Gneiss)

Gneiss

metamorphic

Red Jasper (possibly Chert/Argillite)

Jasper (SiO2) with iron oxide inclusions

sedimentary

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)

metamorphic

Gneiss (Schistose)

Gneiss

metamorphic

Chert (including Flint and Jasper variants)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Chert (Flint)

Chert (SiO2)

sedimentary

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

mineral (man-made composite)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with FeOx inclusions

mineral

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) within a resin matrix

igneous

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

igneous

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Sedimentary-like (Industrial Composite)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

mineral

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

igneous

Diorite (Spotted or Dalmatian Stone pattern)

Diorite

igneous

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

mineral

Red Jasper

Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)

sedimentary

Sandstone or Mudstone with Iron Staining

Ferruginous Sandstone/Mudstone

Sedimentary

Carnelian

Carnelian (Silicon Dioxide: SiO2 with Iron Oxide impurities)

mineral

Chert / Flint

Microcrystalline or cryptocrystalline quartz (SiO2)

sedimentary

Blue Chalcedony (likely dyed Agate)

Silicon Dioxide (SiO₂)

mineral

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Igneous

Geode (unopened) or Calcareous Nodule

Siliceous or Calcareous Concretion/Nodule

sedimentary

Limestone Breccia

Sedimentary Breccia (Calcareous)

sedimentary