Rock Identifier

Category

Granite

Browse granite specimens identified by the Rock Identifier community.

Obsidian (Obsidian (Volcanic Glass, complex silicate)) — igneous

Obsidian

Obsidian (Volcanic Glass, complex silicate)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Dyed Agate (Silicon Dioxide with artificial pigment (SiO2)) — sedimentary

Dyed Agate

Silicon Dioxide with artificial pigment (SiO2)

Fossiliferous Limestone with Rugose Coral (Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil) — sedimentary

Fossiliferous Limestone with Rugose Coral

Calcite (CaCO3) containing a Rugosa (Horn Coral) fossil

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Marble (Recrystallized Calcite (CaCO3)) — metamorphic

Marble

Recrystallized Calcite (CaCO3)

Hematite (Oolitic or Earthy variety) (Iron(III) oxide (Fe2O3)) — mineral

Hematite (Oolitic or Earthy variety)

Iron(III) oxide (Fe2O3)

Zinc Alloy (Silver-plated) (Zinc Alloy Casting (Zn-Al-Mg-Cu)) — mineral (refined metal)

Zinc Alloy (Silver-plated)

Zinc Alloy Casting (Zn-Al-Mg-Cu)

mineral (refined metal)

Moissanite (Silicon Carbide (SiC)) — mineral

Moissanite

Silicon Carbide (SiC)

Amethyst (Silicon dioxide (SiO2)) — mineral

Amethyst

Silicon dioxide (SiO2)

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

Amethyst (Faceted Gemstone)

Silicon Dioxide (SiO2) with iron impurities

Pyrite (Fool's Gold) (Iron Disulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Native Gold (Gold (Au)) — mineral

Native Gold

Gold (Au)

Silicon Carbide (Carborundum) (Silicon Carbide (SiC) / Moissanite (natural)) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Amber / Copal (Organic resin, C10H16O) — mineral

Amber / Copal

Organic resin, C10H16O

Sandstone (with Iron Staining) (Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)) — sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Diamond (in jewelry setting) (Diamond (C - Carbon)) — mineral

Diamond (in jewelry setting)

Diamond (C - Carbon)

Pink Diamond (Carbon (C)) — mineral

Pink Diamond

Carbon (C)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Sulfur (on Matrix) (Native Sulfur (S8)) — mineral

Sulfur (on Matrix)

Native Sulfur (S8)

Lavender Quartz (appearing as beads) and Druzy Quartz (Silicon Dioxide (SiO2)) — mineral

Lavender Quartz (appearing as beads) and Druzy Quartz

Silicon Dioxide (SiO2)

Sandstone (Ferruginous) (Arenite (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Red Jasper (possibly Red Coral or dyed Howlite) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Jasper (possibly Red Coral or dyed Howlite)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (and Fossilized Brachiopod shell) (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (and Fossilized Brachiopod shell)

Sedimentary Cryptocrystalline Quartz (SiO2)

Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

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

Amethyst Geode

Silicon Dioxide with impurities (SiO2)

Amethyst (Amethyst (SiO2 with Iron impurities)) — mineral

Amethyst

Amethyst (SiO2 with Iron impurities)

Aura Quartz (Titanium Quartz) (Titanium-coated Silicon Dioxide (SiO2 + Ti)) — mineral

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Basalt (River Pebble) (Extrusive mafic igneous rock) — igneous

Basalt (River Pebble)

Extrusive mafic igneous rock

Aura Quartz Geodes (Lab-Altered) (Silicon Dioxide (SiO2) with Metallic Vapor Deposition) — mineral

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Gold (Gold (Au)) — mineral

Gold

Gold (Au)

Native Gold (in Jewelry) (Gold (Au)) — mineral

Native Gold (in Jewelry)

Gold (Au)

Prehnite (Prehnite (Ca2Al(AlSi3O10)(OH)2)) — mineral

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Diamond (in jewelry setting) (Cubic Carbon (C)) — mineral

Diamond (in jewelry setting)

Cubic Carbon (C)

White Moonstone (Feldspar) (Potassium aluminum silicate (KAlSi3O8)) — mineral

White Moonstone (Feldspar)

Potassium aluminum silicate (KAlSi3O8)

Green Tourmaline (Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4) — mineral

Green Tourmaline

Elbaite (part of Tourmaline group), Na(Li1.5Al1.5)Al6Si6O18(BO3)3(OH)4

Emerald in Matrix (Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities) — mineral

Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Obsidian (Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)) — igneous

Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)