Rock Identifier

Category

Glass

Browse glass specimens identified by the Rock Identifier community.

Learn about Glass in the encyclopedia

Sideromelane

Black Obsidian

Maskelynite

Tachylite

Obsidian

Hyalite Opal

Perlite

Opalite

Macusanite

Pink Obsidian

Goldstone

Palagonite

Polished dark pebble, likely basalt or chert (Basalt (mafic volcanic rock), possibly microcrystalline chert) — igneous

Polished dark pebble, likely basalt or chert

Basalt (mafic volcanic rock), possibly microcrystalline chert

Chert (Iron-stained) (Microcrystalline silica (SiO2) with Hematite/Limonite) — sedimentary

Chert (Iron-stained)

Microcrystalline silica (SiO2) with Hematite/Limonite

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

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Chert (SiO2)) — sedimentary

Chert

Chert (SiO2)

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

Milky Quartz Pebble with Chert

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (Flint) (Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)) — sedimentary

Chert (Flint)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Silicon Dioxide (SiO2) with aluminum impurities) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Chert (Iron-stained) (Chert (SiO2)) — sedimentary

Chert (Iron-stained)

Chert (SiO2)

Chert (Green River Chert) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Green River Chert)

Microcrystalline Quartz (SiO2)

Yellow quartz crystal (likely citrine) (Quartz, silicon dioxide (SiO₂), iron-colored variety commonly called citrine) — mineral

Yellow quartz crystal (likely citrine)

Quartz, silicon dioxide (SiO₂), iron-colored variety commonly called citrine

Muscovite Mica (Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2) — mineral

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

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

Quartz (Milky or Rough Quartz)

Silicon Dioxide (SiO2)

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

Tumbled Clear Quartz/Rock Crystal

Silicon Dioxide (SiO2)

Quartz (Variety of Rough Mineral Specimens) (Silicon Dioxide (SiO2)) — mineral

Quartz (Variety of Rough Mineral Specimens)

Silicon Dioxide (SiO2)

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

Quartz (Milky/Common 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

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

Tumbled quartz crystal

Quartz (silicon dioxide, SiO₂)

Pink faceted gemstone, likely synthetic or treated quartz (Quartz, silicon dioxide (SiO₂); exact identity cannot be confirmed from the image) — gemstone

Pink faceted gemstone, likely synthetic or treated quartz

Quartz, silicon dioxide (SiO₂); exact identity cannot be confirmed from the image

Tumbled milky quartz (Quartz (SiO₂), cryptocrystalline-to-massive variety) — mineral

Tumbled milky quartz

Quartz (SiO₂), cryptocrystalline-to-massive variety

Tumbled quartz crystal (likely smoky or iron-stained quartz) (Quartz, silicon dioxide (SiO₂)) — mineral

Tumbled quartz crystal (likely smoky or iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

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

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Goldstone (Man-made glass with copper inclusions) — gemstone

Goldstone

Man-made glass with copper inclusions

Weathered quartz-rich rock, possibly milky quartz or quartzite (Quartz (SiO₂), potentially quartzite if metamorphic) — mineral

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

Goldstone (Man-made glass infused with metallic copper) — gemstone

Goldstone

Man-made glass infused with metallic copper

Flint or chert fragment (Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular) — sedimentary

Flint or chert fragment

Microcrystalline quartz (SiO₂), commonly called flint when dark and nodular

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Likely rose quartz (Quartz, SiO₂ (silicon dioxide)) — mineral

Likely rose quartz

Quartz, SiO₂ (silicon dioxide)

Tumbled amethyst (Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation) — mineral

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂), colored mainly by iron impurities and irradiation

Tumbled amethyst (Quartz, purple variety; silicon dioxide (SiO₂) colored mainly by iron-related defects) — mineral

Tumbled amethyst

Quartz, purple variety; silicon dioxide (SiO₂) colored mainly by iron-related defects

Clear quartz crystal (Quartz (silicon dioxide, SiO₂)) — mineral

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Amethyst crystal fragment (Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation) — gemstone

Amethyst crystal fragment

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron and irradiation

Smoky quartz crystal (Quartz (silicon dioxide, SiO₂), likely smoky quartz) — mineral

Smoky quartz crystal

Quartz (silicon dioxide, SiO₂), likely smoky quartz

Weathered quartz-rich rock, likely quartzite (Quartzite (predominantly microcrystalline quartz, SiO₂), possibly quartz-rich sandstone or milky-vein quartz) — metamorphic

Weathered quartz-rich rock, likely quartzite

Quartzite (predominantly microcrystalline quartz, SiO₂), possibly quartz-rich sandstone or milky-vein quartz

Iron-stained quartz-rich rock (likely quartzite or quartz vein material) (Quartz (SiO₂), commonly with limonite/goethite iron oxides; possible quartzite matrix) — metamorphic

Iron-stained quartz-rich rock (likely quartzite or quartz vein material)

Quartz (SiO₂), commonly with limonite/goethite iron oxides; possible quartzite matrix

Muscovite in Pegmatite (KAl2(AlSi3O10)(F,OH)2) — igneous

Muscovite in Pegmatite

KAl2(AlSi3O10)(F,OH)2

Milky quartz pebble (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz pebble

Quartz, silicon dioxide (SiO₂)

Black obsidian (Volcanic glass, predominantly rhyolitic silica glass (approximately 70–80% SiO₂)) — igneous

Black obsidian

Volcanic glass, predominantly rhyolitic silica glass (approximately 70–80% SiO₂)