Rock Identifier

Category

Mineraloid (Human Made Geological Specimen)

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

Tumbled carnelian (likely chalcedony) (Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony) — gemstone

Tumbled carnelian (likely chalcedony)

Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Granodiorite with Quartz Veining (Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins) — igneous

Granodiorite with Quartz Veining

Granodiorite (containing Plagioclase Feldspar, Quartz, and Biotite/Hornblende) with Quartz (SiO2) veins

Ceramic or Polished Stone Heart (Anthropogenic Material) (Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)) — Synthetic/Anthropogenic Mineraloid

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Synthetic/Anthropogenic Mineraloid

Diamond (Native Carbon (C)) — gemstone

Diamond

Native Carbon (C)

Carnelian Agate (Silicon Dioxide (SiO2) with Iron Impurities) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Impurities

Obsidian (Obsidian (Amorphous volcanic glass, SiO2 with impurities)) — igneous

Obsidian

Obsidian (Amorphous volcanic glass, SiO2 with impurities)

Kidney Stone (Calcium Oxalate (CaC2O4·nH2O)) — mineral

Kidney Stone

Calcium Oxalate (CaC2O4·nH2O)

Diamond (Carbon (C)) — mineral

Diamond

Carbon (C)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Cullet Glass (Strawberry Glass) (Amorphous Silicon Dioxide (SiO2) with metallic dopants) — Mineraloid (Synthetic/Man-made)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Mineraloid (Synthetic/Man-made)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Likely weathered basalt or mafic volcanic rock (Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides) — igneous

Likely weathered basalt or mafic volcanic rock

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine or iron oxides

Chert (Yellow or Tan Chert) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow or Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled jasper (likely picture jasper or iron-rich jasper) (Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides) — sedimentary

Tumbled jasper (likely picture jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Chert (and Chert Geode) (Silicon Dioxide (SiO2)) — sedimentary

Chert (and Chert Geode)

Silicon Dioxide (SiO2)

Diamond (faceted) (Diamond (Pure Carbon, C)) — mineral

Diamond (faceted)

Diamond (Pure Carbon, C)

Sunstone (Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)) — mineral

Sunstone

Andesine-Labradorite Feldspar ((Ca,Na)(Al,Si)4O8)

Dyed Fuchsia Agate (Silicon Dioxide (SiO2) - variety Chalcedony) — mineral

Dyed Fuchsia Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Obsidian (Volcanic glass (Amorphous silicon dioxide)) — igneous

Obsidian

Volcanic glass (Amorphous silicon dioxide)

Tumbled brown chalcedony or jasper (Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper) — mineral

Tumbled brown chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Obsidian (Volcanic glass) — igneous

Obsidian

Volcanic glass

Opalite (Opalescent Glass (SiO2 + coloring agents)) — Mineral (Synthetic/Man-made)

Opalite

Opalescent Glass (SiO2 + coloring agents)

Mineral (Synthetic/Man-made)

Tumbled milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Chert (Flint/Chalcedony) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint/Chalcedony)

Silicon Dioxide (SiO2)

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

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Chert (Smooth River Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Smooth River Pebble)

Microcrystalline Quartz (SiO2)

Chert (Jasper / Quartz pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper / Quartz pebble)

Microcrystalline Quartz (SiO2)

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

Cubic Zirconia

Cubic Zirconium Dioxide (ZrO2)

Fossilized Shell in Limestone (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossilized Shell in Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Muscovite Mica in Quartz (Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)) — metamorphic

Muscovite Mica in Quartz

Potassium Aluminum Silicate Hydroxide (KAl2(AlSi3O10)(OH)2) and Silicon Dioxide (SiO2)

Chert (Nodular or Massive Variety) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Desert Rose (Gypsum) (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Desert Rose (Gypsum)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Chert Nodule (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Quartz (SiO2)

Blue-green chrysocolla rough specimen (Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite) — mineral

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Dzi Bead (Etched Chalcedony) (Cryptocrystalline Quartz (SiO2) with chemical etching) — mineral

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Polished rose quartz (Rose quartz (quartz), SiO₂) — mineral

Polished rose quartz

Rose quartz (quartz), SiO₂

Tumbled orange chalcedony and a gray stone disk (Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate) — mineral

Tumbled orange chalcedony and a gray stone disk

Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate

Dyed Pink Agate (Silicon Dioxide (SiO2) - variety Chalcedony) — mineral

Dyed Pink Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Obsidian (Obsidian (Extrusive Volcanic Glass)) — igneous

Obsidian

Obsidian (Extrusive Volcanic Glass)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)