Rock Identifier

Category

Granite

Browse granite specimens identified by the Rock Identifier community.

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

Hematite

Iron(III) oxide (Fe2O3)

mineral
Basalt (Aphanitic Mafic Igneous Rock) — igneous

Basalt

Aphanitic Mafic Igneous Rock

igneous
Chert (Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2)

sedimentary
Basalt (Basalt) — igneous

Basalt

Basalt

igneous
Limonite (Iron Ore) (Limonite (Hydrated iron oxide - FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (Hydrated iron oxide - FeO(OH)·nH2O)

mineral
Pyrite (Iron Disulfide (FeS2)) — mineral

Pyrite

Iron Disulfide (FeS2)

mineral
Anthracite Coal (Anthracite (Carbon-rich metamorphic coal)) — sedimentary

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

sedimentary
Selenite (Satin Spar Gypsum) (Calcium Sulfate Dihydrate (CaSO4·2H2O)) — mineral

Selenite (Satin Spar Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

mineral
Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic
Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

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

Hematite

Iron(III) oxide (Fe2O3)

mineral
Red Tiger's Eye (SiO2 (Silicon Dioxide with iron inclusions)) — mineral

Red Tiger's Eye

SiO2 (Silicon Dioxide with iron inclusions)

mineral
Basalt (River Pebble) (Basalt) — igneous

Basalt (River Pebble)

Basalt

igneous
Basalt (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

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

Yellow Aventurine

Silicon Dioxide (SiO2) with inclusions

mineral
Amber (Copal) (Succinite (fossilized tree resin)) — mineral

Amber (Copal)

Succinite (fossilized tree resin)

mineral
Diamond (Diamond (C)) — mineral

Diamond

Diamond (C)

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

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

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

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

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

Amethyst (Cabochon)

Silicon Dioxide (SiO2) with iron impurities

mineral
Chevron Amethyst (SiO2 (Quartz with Manganese/Iron impurities)) — mineral

Chevron Amethyst

SiO2 (Quartz with Manganese/Iron impurities)

mineral
Bronzite (Enstatite (var. Bronzite), (Mg,Fe)SiO3) — mineral

Bronzite

Enstatite (var. Bronzite), (Mg,Fe)SiO3

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

Rose Quartz

Rose Quartz (Silicon Dioxide, SiO2)

mineral
Celestine (or Celestite) Geode (Strontium Sulfate (SrSO4)) — mineral

Celestine (or Celestite) Geode

Strontium Sulfate (SrSO4)

mineral
Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

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

Milky Quartz Pebbles

Silicon Dioxide (SiO2)

mineral
Chert (Tan/Grey variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Tan/Grey variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

sedimentary
Caribbean Calcite (Calcite (CaCO3) with Aragonite (CaCO3)) — mineral

Caribbean Calcite

Calcite (CaCO3) with Aragonite (CaCO3)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Agate (Silicon Dioxide (SiO2)) — mineral

Agate

Silicon Dioxide (SiO2)

mineral
Quartz Geode (Cracked) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Cracked)

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Chert / Flint (Chert (Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert / Flint

Chert (Cryptocrystalline Quartz, SiO2)

sedimentary
Chert (Agatized) (Silicon dioxide (SiO2)) — sedimentary

Chert (Agatized)

Silicon dioxide (SiO2)

sedimentary
Chalcedony (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony

Cryptocrystalline Quartz (SiO2)

mineral
Quartz (Milky/Smoky variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

mineral
Blue Apatite (Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)) — mineral

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

mineral
Chalcopyrite (Peacock Ore) (Chalcopyrite (CuFeS2)) — mineral

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

mineral
Pearl (Aragonite / Calcium Carbonate (CaCO3)) — mineraloid

Pearl

Aragonite / Calcium Carbonate (CaCO3)

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

Clear Quartz (Rock Crystal)

Quartz (Silicon Dioxide, SiO2)

mineral