Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Amethyst (SiO2 (Silicon Dioxide with iron impurities)) — mineral

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Amethyst (Quartz (Silicon Dioxide with Iron impurities), SiO2) — mineral

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Chalcedony with Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Chalcedony with Druzy Quartz

Silicon Dioxide (SiO2)

Chert (Tan/Grey) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Tan/Grey)

Chert (Silicon Dioxide, SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Magnetite (Lodestone) (Iron(II,III) oxide (Fe3O4)) — mineral

Magnetite (Lodestone)

Iron(II,III) oxide (Fe3O4)

Hematite (Iron Ore) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — mineral

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Native Silver (Silver (Ag)) — mineral

Native Silver

Silver (Ag)

Chert (Flint) (Chert (SiO2)) — sedimentary

Chert (Flint)

Chert (SiO2)

Basalt River Cobble (Basalt) — igneous

Basalt River Cobble

Basalt

Tiger's Eye (Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2) — metamorphic

Tiger's Eye

Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2

Chert (often called Flint when dark or worked) (Cryptocrystalline silica (SiO2)) — sedimentary

Chert (often called Flint when dark or worked)

Cryptocrystalline silica (SiO2)

Red Quartzite / Jasper-rich Pebble (Quartzite (primarily SiO2 with hematite inclusions)) — metamorphic

Red Quartzite / Jasper-rich Pebble

Quartzite (primarily SiO2 with hematite inclusions)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Quartz or Citrine Geode/Cluster (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz or Citrine Geode/Cluster

Silicon Dioxide (SiO2)

Milky Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Citrine (Heat-treated or Natural Quartz) (Silicon Dioxide (SiO2)) — mineral

Citrine (Heat-treated or Natural Quartz)

Silicon Dioxide (SiO2)

Red Jasper (SiO2 (Microcrystalline Quartz)) — Mineral

Red Jasper

SiO2 (Microcrystalline Quartz)

Almandine Garnet (Almandine (Fe3Al2(SiO4)3)) — mineral

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Chert (Cream Variety) (Microcrystalline silica (SiO2)) — sedimentary

Chert (Cream Variety)

Microcrystalline silica (SiO2)

Milky Quartz with Matrix (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Clear or Cloudy) (Silicon Dioxide (SiO2)) — mineral

Quartz (Clear or Cloudy)

Silicon Dioxide (SiO2)

Sandstone (lithic wacke/conglomerate mix) (Clastic Sedimentary Rock (SiO2 with lithic fragments)) — sedimentary

Sandstone (lithic wacke/conglomerate mix)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Carnelian (Carnelian (SiO2 with iron oxide impurities)) — mineral

Carnelian

Carnelian (SiO2 with iron oxide impurities)

Chert (Channery Chert (Microcrystalline Quartz)) — sedimentary

Chert

Channery Chert (Microcrystalline Quartz)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Limonite (Iron Ore) (Hydrated ferric oxide mixture (FeO(OH)·nH2O)) — sedimentary

Limonite (Iron Ore)

Hydrated ferric oxide mixture (FeO(OH)·nH2O)

Puddingstone (Jasper Conglomerate) (Jasper Conglomerate (SiO2 matrix with Fe2O3 inclusions)) — sedimentary

Puddingstone (Jasper Conglomerate)

Jasper Conglomerate (SiO2 matrix with Fe2O3 inclusions)

Chert (specifically Flint or Common Chert) (Chert (Cryptocrystalline Silica, SiO2)) — sedimentary

Chert (specifically Flint or Common Chert)

Chert (Cryptocrystalline Silica, SiO2)

Chert (variations include Flint or Jasper) (Aphanitic Silica (SiO2)) — sedimentary

Chert (variations include Flint or Jasper)

Aphanitic Silica (SiO2)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Specular Hematite (Specularite (Iron Oxide, Fe2O3)) — mineral

Specular Hematite

Specularite (Iron Oxide, Fe2O3)

Yellow Jasper (Silicon Dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)