Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

Browse mineraloid (human made geological specimen) specimens identified by the Rock Identifier community.

Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Limestone (CaCO3 (Calcium Carbonate)) — sedimentary

Limestone

CaCO3 (Calcium Carbonate)

Cubic Zirconia (Jewelry Setting) (Zirconium Dioxide (ZrO2)) — gemstone

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Diamond (Native Carbon (C)) — mineral

Diamond

Native Carbon (C)

Chert (Jasper/Flint variant) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalcopyrite (CuFeS2 (Copper Iron Sulfide)) — mineral

Chalcopyrite

CuFeS2 (Copper Iron Sulfide)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Amethyst (Quartz (SiO2)) — mineral

Amethyst

Quartz (SiO2)

Flint (SiO2 (Cryptocrystalline Quartz)) — sedimentary

Flint

SiO2 (Cryptocrystalline Quartz)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Stichtite in Serpentine (Atlantasite) (Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4) — metamorphic

Stichtite in Serpentine (Atlantasite)

Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4

Chert (Red/Pink Jasper subtype) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Red/Pink Jasper subtype)

Silicon Dioxide (SiO2)

Tumbled pale stone, likely milky quartz or calcite (Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing) — mineral

Tumbled pale stone, likely milky quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Basalt (Basalt) — Igneous

Basalt

Basalt

Granite (Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (River Cobble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Cobble)

Silicon Dioxide (SiO2)

Yellow Quartz or Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz or Citrine Quartz

Silicon Dioxide (SiO2)

Schist (Greenschist / Mica Schist) (Schist (variable mineral composition, commonly containing quartz, feldspar, mica, chlorite)) — metamorphic

Schist (Greenschist / Mica Schist)

Schist (variable mineral composition, commonly containing quartz, feldspar, mica, chlorite)

Sandstone (with Iron Staining) (Quartz Arenite / Ferruginous Sandstone) — sedimentary

Sandstone (with Iron Staining)

Quartz Arenite / Ferruginous Sandstone

Oak-grain Laminate (Industrial/Decorative Furniture Finish) (Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)) — not a rock (synthetic material)

Oak-grain Laminate (Industrial/Decorative Furniture Finish)

Melamine Resin-impregnated Decorative Paper on Particleboard (Cellulose/Thermosetting Plastic)

not a rock (synthetic material)

Sandstone (Quartzose) (Arenite (SiO2 principal)) — sedimentary

Sandstone (Quartzose)

Arenite (SiO2 principal)

Chert Conglomerate (Potomac Puddle Stone) (Sedimentary Conglomerate with Iron-Oxide matrix) — sedimentary

Chert Conglomerate (Potomac Puddle Stone)

Sedimentary Conglomerate with Iron-Oxide matrix

Quartz (specifically Citrine or Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz (Herkimer-style) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (Herkimer-style)

Silicon Dioxide (SiO2)

Tumbled pink feldspar (likely orthoclase or microcline) (Potassium feldspar, KAlSi₃O₈) — mineral

Tumbled pink feldspar (likely orthoclase or microcline)

Potassium feldspar, KAlSi₃O₈

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Dyed Tumbled Quartz (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Tumbled Quartz

Silicon Dioxide (SiO2) with artificial pigment

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mahogany Obsidian (Volcanic glass (SiO2 + Fe2O3)) — igneous

Mahogany Obsidian

Volcanic glass (SiO2 + Fe2O3)

Polished brown stone, likely smoky quartz or jasper (Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing) — mineral

Polished brown stone, likely smoky quartz or jasper

Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing

Limonite (Iron Stone Concretion) (Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O) — mineral

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

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

Chert (Flint Nodules)

Microcrystalline Quartz (SiO2)

Granite (Phaneritic plutonic igneous rock (SiO2 range 65-75%)) — igneous

Granite

Phaneritic plutonic igneous rock (SiO2 range 65-75%)

Brecciated Quartzite (Brecciated Quartzite) — Metamorphic

Brecciated Quartzite

Brecciated Quartzite

Gold Ore (Auriferous Quartz and Sulfide Mineralization in Host Rock) — igneous

Gold Ore

Auriferous Quartz and Sulfide Mineralization in Host Rock

Ambergris (Ambrein (C30H52O)) — mineraloid / organic geological substance

Ambergris

Ambrein (C30H52O)

mineraloid / organic geological substance

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)