Rock Identifier

Category

Mineraloid (Man Made Glass)

Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.

Learn about Mineraloid (Man Made Glass) in the encyclopedia

Opalite

Goldstone

Shungite

Blue Goldstone

Sideromelane

Black Obsidian

Maskelynite

Obsidian

Tachylite

Map Jasper

Hyalite Opal

Perlite

Fulgurite (Fulgurite (Lechatelierite/Silica glass)) — mineral

Fulgurite

Fulgurite (Lechatelierite/Silica glass)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Chert (Nodule) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Quartzite Pebble (Quartzite (SiO2)) — metamorphic

Yellow Quartzite Pebble

Quartzite (SiO2)

Limestone (River Pebble) (Calcium Carbonate (CaCO3)) — sedimentary

Limestone (River Pebble)

Calcium Carbonate (CaCO3)

Green Slag Glass (Amorphous Silicon Dioxide (with metallic impurities)) — Igneous (Anthropogenic)

Green Slag Glass

Amorphous Silicon Dioxide (with metallic impurities)

Igneous (Anthropogenic)

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

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Chert (or potentially massive Quartz/Quartzite) (SiO2 (Silicon Dioxide)) — sedimentary (if chert) / metamorphic (if quartzite)

Chert (or potentially massive Quartz/Quartzite)

SiO2 (Silicon Dioxide)

sedimentary (if chert) / metamorphic (if quartzite)

Chert (Microcrystalline quartz (SiO2)) — sedimentary

Chert

Microcrystalline quartz (SiO2)

Petrified Wood (Silicified Wood (Permineralized organic tissue)) — fossil

Petrified Wood

Silicified Wood (Permineralized organic tissue)

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

Citrine (or Yellow Chalcedony / Quartz)

Silicon Dioxide (SiO2)

Tumbled Rose Quartz (Silicon Dioxide (SiO2)) — mineral

Tumbled Rose Quartz

Silicon Dioxide (SiO2)

Quartz with Iron Staining (Silicon Dioxide (SiO2) with Hematite/Limonite inclusions) — mineral

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

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

Chert (Flint)

SiO2 (Microcrystalline Quartz)

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

Chert (variations include Flint/Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Tan/Yellow variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Tan/Yellow variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Iron-stained Quartz (Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)) — mineral

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)

Chalcedony (Common Opal or Agate variant) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Common Opal or Agate variant)

Silicon Dioxide (SiO₂)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz with Iron Staining (Silicon Dioxide (SiO2) with Hematite inclusions) — mineral

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Weathered quartz-rich rock, possibly chert or quartzite fragment (Indeterminate; likely microcrystalline quartz (SiO₂), possibly with iron-oxide staining) — metamorphic

Weathered quartz-rich rock, possibly chert or quartzite fragment

Indeterminate; likely microcrystalline quartz (SiO₂), possibly with iron-oxide staining

Tumbled yellow quartz (likely citrine or iron-stained quartz) (Quartz, SiO₂; yellow color from trace iron or irradiation/heat-related coloration) — mineral

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, SiO₂; yellow color from trace iron or irradiation/heat-related coloration

Quartz Mineral Specimens (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz Mineral Specimens

Quartz (Silicon Dioxide, SiO2)

Amethyst (Tumbled Quarz) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Tumbled Quarz)

Silicon Dioxide (SiO2) with iron impurities

Tumbled blue chalcedony (likely blue quartz/chalcedony) (Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated) — mineral

Tumbled blue chalcedony (likely blue quartz/chalcedony)

Cryptocrystalline silica, SiO₂; likely chalcedony, possibly dyed or surface-coated

Snowflake Obsidian (Volcanic Glass with Spherulitic Cristobalite (SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Spherulitic Cristobalite (SiO2)

Quartz pebble (Quartz (Silicon dioxide, SiO2)) — mineral

Quartz pebble

Quartz (Silicon dioxide, SiO2)

Chert or flint fragment (Microcrystalline quartz (SiO₂), likely silicified rock) — sedimentary

Chert or flint fragment

Microcrystalline quartz (SiO₂), likely silicified rock

Multi-Gemstone Quartz Bracelet (Amethyst, Aventurine, Rose Quartz, Clear Quartz) (Silicon Dioxide (SiO2) mixture) — gemstone

Multi-Gemstone Quartz Bracelet (Amethyst, Aventurine, Rose Quartz, Clear Quartz)

Silicon Dioxide (SiO2) mixture

Quartz Grain (Silicon Dioxide (SiO2)) — mineral

Quartz Grain

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock (often Granite or Schist) (Silicon Dioxide (SiO2) within host matrix) — mineral with metamorphic or igneous host

Quartz Vein in Host Rock (often Granite or Schist)

Silicon Dioxide (SiO2) within host matrix

mineral with metamorphic or igneous host

Tumbled goldstone-like quartz pebble (Likely iron-stained quartz or jasper; exact identification requires testing) — mineral

Tumbled goldstone-like quartz pebble

Likely iron-stained quartz or jasper; exact identification requires testing

Tumbled cream chalcedony or quartz (Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony) — mineral

Tumbled cream chalcedony or quartz

Microcrystalline quartz, SiO₂; possibly iron-stained chalcedony

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

Quartz (Iron-stained River Pebble)

Silicon Dioxide (SiO2)

Quartz Pebble with Host Rock / Schist Matrix (Silicon Dioxide (SiO2) with Metamorphic Host Rock) — sedimentary

Quartz Pebble with Host Rock / Schist Matrix

Silicon Dioxide (SiO2) with Metamorphic Host Rock

Quartz with Iron Oxide Inclusions (Silicon Dioxide (SiO2)) — mineral

Quartz with Iron Oxide Inclusions

Silicon Dioxide (SiO2)

Milky Quartz / Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Milky Quartz / Quartz Geode Fragment

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Silica (SiO2)

Agate (Plume/Moss variety) (Cryptocrystalline Quartz (SiO2) with iron/manganese inclusions) — mineral

Agate (Plume/Moss variety)

Cryptocrystalline Quartz (SiO2) with iron/manganese inclusions

Polished pink quartzite or jasper (Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony) — metamorphic

Polished pink quartzite or jasper

Quartzite, predominantly SiO₂; possibly iron-stained jasper/chalcedony

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

Chert / Flint Nodule

Microcrystalline or Cryptocrystalline Quartz (SiO2)