Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Amethyst (Agate/Chalcedony variety) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Agate/Chalcedony variety)

Silicon Dioxide (SiO2) with iron impurities

Sandstone with Desert Varnish (Arenite with Ferromanganese patina) — sedimentary

Sandstone with Desert Varnish

Arenite with Ferromanganese patina

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Citrine (Quartz (SiO₂)) — mineral

Citrine

Quartz (SiO₂)

Cubic Zirconia (CZ) in Gold-Plated Setting (Cubic Zirconium Dioxide (ZrO2)) — mineral

Cubic Zirconia (CZ) in Gold-Plated Setting

Cubic Zirconium Dioxide (ZrO2)

Gold Flakes (Native Gold (Au)) — mineral

Gold Flakes

Native Gold (Au)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

River Cobble (likely Quartzite) (Metamorphosed Sandstone (SiO2)) — metamorphic

River Cobble (likely Quartzite)

Metamorphosed Sandstone (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (SiO2 (Quartz with inclusion of iron oxides)) — mineral

Tiger's Eye

SiO2 (Quartz with inclusion of iron oxides)

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

Amethyst (Polished Point)

Silicon Dioxide (SiO2) with iron impurities

Pearl (incorporated into jewelry) (Aragonite and Calcite (CaCO3)) — mineral

Pearl (incorporated into jewelry)

Aragonite and Calcite (CaCO3)

Ironstone Concretion (Moqui Marble) (Iron Oxide Concretion (Goethite and Hematite around a Sandstone core)) — sedimentary

Ironstone Concretion (Moqui Marble)

Iron Oxide Concretion (Goethite and Hematite around a Sandstone core)

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Quartzite Pebble (Metamorphic rock predominantly composed of Quartz (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic rock predominantly composed of Quartz (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Gowganda Tillite (Puddingstone) (Glacial Tillite (Diamictite) with Jasper inclusions) — sedimentary

Gowganda Tillite (Puddingstone)

Glacial Tillite (Diamictite) with Jasper inclusions

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

Hematite Ball

Iron(III) oxide (Fe2O3)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Gossan (Iron Cap) (Limonitic Gossan (Fe2O3·nH2O mixed)) — sedimentary

Gossan (Iron Cap)

Limonitic Gossan (Fe2O3·nH2O mixed)

Sand Grain (Silica/Quartz Grain) (Silicon Dioxide (SiO2)) — sedimentary

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Green Aventurine (SiO2) — mineral

Green Aventurine

SiO2

Silver (Ag (Native Silver)) — mineral

Silver

Ag (Native Silver)

Amethyst and Rose Quartz Beads (Crystalline Quartz (SiO2) with trace elements) — gemstone

Amethyst and Rose Quartz Beads

Crystalline Quartz (SiO2) with trace elements

Clear Quartz (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Chert (Iron-stained) (Microcrystalline Silica (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Silica (SiO2)

Lapis Lazuli (Low-grade) (Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)) — metamorphic

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

River Pebble (Quartzite/Chert) (Silicon Dioxide (SiO2)) — sedimentary

River Pebble (Quartzite/Chert)

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz) (Silicon Dioxide (SiO2) with inclusions/dye) — gemstone

Rose Quartz and Cherry Quartz (Dyed Glass/Quartz)

Silicon Dioxide (SiO2) with inclusions/dye

Bloodstone (Heliotrope) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Bloodstone (Heliotrope)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Limonite Sandstone (Ferruginous Sandstone (Hydrated Iron Oxide)) — sedimentary

Limonite Sandstone

Ferruginous Sandstone (Hydrated Iron Oxide)

Red Jasper with Quartz Vein (Microcrystalline Quartz (SiO2) with Hematite inclusions) — sedimentary

Red Jasper with Quartz Vein

Microcrystalline Quartz (SiO2) with Hematite inclusions

Chert Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble

Microcrystalline Quartz (SiO2)

Green Jasper / Chalcedony (Silicon Dioxide (SiO2)) — sedimentary

Green Jasper / Chalcedony

Silicon Dioxide (SiO2)

Blue Quartzite (likely dyed) (Silicon dioxide (SiO2) with likely color treatment) — metamorphic

Blue Quartzite (likely dyed)

Silicon dioxide (SiO2) with likely color treatment

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Yellow Aventurine (Silicon Dioxide with inclusions (SiO2)) — mineral

Yellow Aventurine

Silicon Dioxide with inclusions (SiO2)

Amethyst and Titanium Treated Druzy (Silicon Dioxide (SiO2) with trace impurities including Iron) — mineral

Amethyst and Titanium Treated Druzy

Silicon Dioxide (SiO2) with trace impurities including Iron

Chert / Flint (Cryptocrystalline quartz (SiO2)) — Sedimentary

Chert / Flint

Cryptocrystalline quartz (SiO2)