Rock Identifier

Category

Tektite (Natural Glass)

Browse tektite (natural glass) specimens identified by the Rock Identifier community.

Learn about Tektite (Natural Glass) in the encyclopedia

Macusanite

Moldavite

Obsidian

Black Obsidian

Green Obsidian

Blue Obsidian

Midnight Obsidian

Maskelynite

Pink Obsidian

Purple Obsidian

Purple Obsidian

Teal Obsidian

Yellow-Green Obsidian

Yellow-Green Obsidian

Optical Calcite (Iceland Spar) (Calcite (Calcium Carbonate, CaCO3)) — mineral

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Rounded quartz-rich cobble (Likely quartzite or siliceous sandstone; predominantly microcrystalline SiO₂ with possible feldspar and iron-oxide staining) — sedimentary

Rounded quartz-rich cobble

Likely quartzite or siliceous sandstone; predominantly microcrystalline SiO₂ with possible feldspar and iron-oxide staining

Chelyabinsk Meteorite (Ordinary chondrite (LL5)) — meteorite

Chelyabinsk Meteorite

Ordinary chondrite (LL5)

Citrine Geode Fragment (Citrine (Silicon Dioxide with Iron Impurities), SiO2) — mineral

Citrine Geode Fragment

Citrine (Silicon Dioxide with Iron Impurities), SiO2

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

Amethyst Geodes

Silicon Dioxide (Quartz with Iron impurities), SiO2

Obsidian (Apache Tears) (Volcanic Glass (Silicic Obsidian)) — igneous

Obsidian (Apache Tears)

Volcanic Glass (Silicic Obsidian)

Weathered flint or chert fragment (Microcrystalline quartz (SiO₂), likely chert/flint) — sedimentary

Weathered flint or chert fragment

Microcrystalline quartz (SiO₂), likely chert/flint

Granite (Granite (Phaneritic Quartz-Feldspar rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar rock)

Quartzite (Lithic Artifact) (Quartzite (SiO2)) — metamorphic

Quartzite (Lithic Artifact)

Quartzite (SiO2)

Selenite (gypsum) (Gypsum, CaSO₄·2H₂O; variety: selenite) — mineral

Selenite (gypsum)

Gypsum, CaSO₄·2H₂O; variety: selenite

Amethyst (Silicon Dioxide (Quartz variety), SiO2) — mineral

Amethyst

Silicon Dioxide (Quartz variety), SiO2

$Tumbled quartz pebble (Quartz (SiO₂), likely milky or fractured rock crystal) — mineral$

Tumbled quartz pebble

Quartz (SiO₂), likely milky or fractured rock crystal

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Yellow Quartz (Citrine-colored Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine-colored Quartz Pebble)

Silicon Dioxide (SiO2)

Likely tumbled jasper or iron-rich chert (Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing) — mineral

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing

Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — sedimentary

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Tumbled light-colored stone, possibly quartzite or limestone (Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)) — metamorphic

Tumbled light-colored stone, possibly quartzite or limestone

Indeterminate; likely quartzite (mostly SiO₂) or calcitic limestone (CaCO₃)

White quartz pebble (Quartz (silicon dioxide, SiO₂), likely milky quartz) — mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Jasper with Quartz Veining (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities

Brecciated Jasper (Polished) (Silicon Dioxide (SiO2) with Iron Oxide Impurities) — sedimentary

Brecciated Jasper (Polished)

Silicon Dioxide (SiO2) with Iron Oxide Impurities

Red Jasper (Skull Carving) (Jasper, a cryptocrystalline variety of Quartz (SiO2)) — sedimentary

Red Jasper (Skull Carving)

Jasper, a cryptocrystalline variety of Quartz (SiO2)

Red Jasper (Silicon dioxide (SiO2) with hematite impurities) — sedimentary

Red Jasper

Silicon dioxide (SiO2) with hematite impurities

Jasper (Jasper (Silica/Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silica/Silicon Dioxide, SiO2)

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

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

Red Jasper (River Siltstone)

Silicon Dioxide (SiO2) with iron oxide inclusions

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

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Limonite inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Limonite inclusions

Apache Tear (Obsidian) (Obsidian (Hydrated Amorphous Silica, SiO2 + MgO/Fe3O4)) — igneous

Apache Tear (Obsidian)

Obsidian (Hydrated Amorphous Silica, SiO2 + MgO/Fe3O4)

Granite Pebble (Granite (Plutonic Igneous Rock)) — igneous

Granite Pebble

Granite (Plutonic Igneous Rock)

Beryl (Emerald or Aquamarine in Matrix) (Beryllium Aluminum Silicate (Be3Al2Si6O18)) — mineral

Beryl (Emerald or Aquamarine in Matrix)

Beryllium Aluminum Silicate (Be3Al2Si6O18)

Quartz Sand (Beach Sand) (Silicon Dioxide (SiO2)) — sedimentary

Quartz Sand (Beach Sand)

Silicon Dioxide (SiO2)

Quartz-rich rock fragment, possibly granite or quartzite (Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining) — igneous or metamorphic

Quartz-rich rock fragment, possibly granite or quartzite

Primarily quartz (SiO₂), with possible feldspar and iron-oxide staining

igneous or metamorphic

Amethyst (Chevron or Banded) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Chevron or Banded)

Silicon Dioxide (SiO2) with iron impurities

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

Amethyst

Amethyst (Silicon Dioxide - SiO2 with ferric impurities)

Apache Tear (Obsidian) (Volcanic glass / Amorphous SiO2) — igneous

Apache Tear (Obsidian)

Volcanic glass / Amorphous SiO2

Herkimer Diamond (Quartz (Silica - SiO2)) — mineral

Herkimer Diamond

Quartz (Silica - SiO2)

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

Quartz Geode (Smoky Quartz)

Silicon Dioxide (SiO2)

Rose quartz heart (Quartz, silicon dioxide (SiO₂), pink variety) — mineral

Rose quartz heart

Quartz, silicon dioxide (SiO₂), pink variety

Dyed Crackle Quartz (Silicon Dioxide (SiO2) with synthetic dye) — mineral

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

Tumbled milky quartz (Quartz (SiO₂), microcrystalline or massive variety) — mineral

Tumbled milky quartz

Quartz (SiO₂), microcrystalline or massive variety

Tumbled green aventurine (probable) (Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions) — mineral

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions