Rock Identifier

Category

Synthetic (Not A Natural Rock)

Browse synthetic (not a natural rock) specimens identified by the Rock Identifier community.

Learn about Synthetic (Not A Natural Rock) in the encyclopedia

Asphalt Rock

Yttrium Aluminum Garnet

Yttrium Aluminum Garnet

Chalk

Zircon

Obsidian

Kimberlite

Emerald in Matrix

Emerald in Matrix

Tripolite

Guano

Halite

Aquamarine Matrix

Aquamarine Matrix

Rock Salt

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

Amethyst

Quartz (Silicon Dioxide with iron impurities), SiO2

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Raw smoky quartz with dark mineral inclusions (Quartz (SiO₂), likely smoky quartz; dark inclusions may be chlorite, tourmaline, or iron/manganese oxides) — mineral

Raw smoky quartz with dark mineral inclusions

Quartz (SiO₂), likely smoky quartz; dark inclusions may be chlorite, tourmaline, or iron/manganese oxides

Blue Topaz (Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)) — gemstone

Blue Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Quartzite (SiO2 (Silicon Dioxide / Metamorphic Quartz)) — metamorphic

Quartzite

SiO2 (Silicon Dioxide / Metamorphic Quartz)

Chert / Flint (Silicon dioxide (Microcrystalline Quartz, $SiO_2$)) — sedimentary

Chert / Flint

Silicon dioxide (Microcrystalline Quartz, $SiO_2$)

Quartzite Pebble (Metamorphic Quartzite) — metamorphic

Quartzite Pebble

Metamorphic Quartzite

Citrine Quartz (Silicon Dioxide (SiO2) with trace Iron) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with trace Iron

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

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Chert (Vuggy or Weathered) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Vuggy or Weathered)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Diamond (or diamond simulant) (C) — gemstone

Diamond (or diamond simulant)

C

Carnelian Agate (SiO2 (Silicon Dioxide - Chalcedony variant)) — gemstone

Carnelian Agate

SiO2 (Silicon Dioxide - Chalcedony variant)

Quartz with Iron Stains (Silicon Dioxide (SiO2) with FeOx inclusions) — mineral

Quartz with Iron Stains

Silicon Dioxide (SiO2) with FeOx inclusions

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

Quartz (Citrine / Yellow Quartz)

Silicon Dioxide (SiO2)

Polished blue-green glassy slag or coated mineral fragment (Most likely man-made colored glass/slag; exact composition cannot be determined visually) — mineral

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Smoky Quartz on Matrix (Crystalline Silicon Dioxide (SiO2)) — mineral

Smoky Quartz on Matrix

Crystalline Silicon Dioxide (SiO2)

Obsidian (Volcanic Glass (Amorphous SiO2)) — igneous

Obsidian

Volcanic Glass (Amorphous SiO2)

Diamond ring (Diamond (crystalline carbon, C)) — gemstone

Diamond ring

Diamond (crystalline carbon, C)

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

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Amethyst (Amethyst (Silicon Dioxide, SiO2 with Iron impurities)) — mineral

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Blue Agate (Dyed) (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Blue Agate (Dyed)

Silicon Dioxide (Chalcedony), SiO2

Smoky Quartz (Quartz (SiO2) with natural radiation) — mineral

Smoky Quartz

Quartz (SiO2) with natural radiation

Diamond (Natural Diamond (Carbon, C)) — mineral

Diamond

Natural Diamond (Carbon, C)

Snowflake Obsidian (Obsidian with Cristobalite inclusions (70-75% SiO2)) — igneous

Snowflake Obsidian

Obsidian with Cristobalite inclusions (70-75% SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Jasper) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Jasper)

Silicon Dioxide (SiO2)

Purple Banded Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Purple Banded Agate

Cryptocrystalline Quartz (SiO2)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Quartz with Epidote (Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate [Ca2(Al,Fe)3(SiO4)3(OH)]) — metamorphic

Quartz with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate [Ca2(Al,Fe)3(SiO4)3(OH)]

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Flint (Silicon dioxide (SiO2) - cryptocrystalline quartz) — sedimentary

Flint

Silicon dioxide (SiO2) - cryptocrystalline quartz

Hematite Pebble (Hematite (Fe2O3)) — mineral

Hematite Pebble

Hematite (Fe2O3)

Apache Tear (Obsidian (Natural volcanic glass)) — igneous

Apache Tear

Obsidian (Natural volcanic glass)

Rainbow Hematite (Titanium-Coated Hematite) (Titanium-treated Hematite (Fe2O3)) — mineral

Rainbow Hematite (Titanium-Coated Hematite)

Titanium-treated Hematite (Fe2O3)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (specifically Flint or Jasper variant)

Microcrystalline quartz (SiO2)

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

Chert / Flint

Microcrystalline Quartz (SiO2)

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

Yellow Quartz

SiO2 (Crystalline Silicon Dioxide)

Quartzite (with Mica / Quartzite Schist) (SiO2 (Silica) with minor Muscovite Mica KAl2(AlSi3O10)(OH)2) — metamorphic

Quartzite (with Mica / Quartzite Schist)

SiO2 (Silica) with minor Muscovite Mica KAl2(AlSi3O10)(OH)2

Red Jasper (Chert) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions