Rock Identifier

Category

Mineral Like (Natural Glass)

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

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

Diamond

Diamond (Pure Carbon, C)

mineral
Onyx (Black Onyx) (Silicon Dioxide (SiO2) - Chalcedony variety) — Mineral

Onyx (Black Onyx)

Silicon Dioxide (SiO2) - Chalcedony variety

Mineral
Milky Quartz (Quartz (SiO2)) — mineral

Milky Quartz

Quartz (SiO2)

mineral
Quartz (Microcrystalline Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Microcrystalline Fragment)

Silicon Dioxide (SiO2)

mineral
Sandstone (Arenite (primarily composed of SiO2)) — sedimentary

Sandstone

Arenite (primarily composed of SiO2)

sedimentary
Diamond (Diamond (pure Carbon, C)) — mineral

Diamond

Diamond (pure Carbon, C)

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

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

mineral
Concrete (Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)) — sedimentary (artificial)

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

sedimentary (artificial)
Amethyst (Silicon Dioxide (SiO2) with trace Iron (Fe)) — mineral

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe)

mineral
Quartz Vein in Host Rock (Silicon Dioxide (SiO2) within metamorphic/igneous matrix) — igneous/metamorphic

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within metamorphic/igneous matrix

igneous/metamorphic
Quartz (Milky/Clear variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

mineral
Chert Nodule (with Flint core) (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert Nodule (with Flint core)

Sedimentary Cryptocrystalline Quartz (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

mineral
Blue Lace Agate (Geode/Druzy variant) (Chalcedony (SiO2) with Quartz druzy) — mineral

Blue Lace Agate (Geode/Druzy variant)

Chalcedony (SiO2) with Quartz druzy

mineral
Lepidolite (Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)) — mineral

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

mineral
Lepidolite (Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)) — mineral

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

mineral
Black Onyx (Silicon dioxide (SiO2) with parallel banded structure) — Mineral (variety of chalcedony)

Black Onyx

Silicon dioxide (SiO2) with parallel banded structure

Mineral (variety of chalcedony)
Quartz (specifically Clear Quartz or Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Clear Quartz or Rock Crystal)

Silicon Dioxide (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral
Bismuth Crystal (Bismuth (Bi)) — mineral

Bismuth Crystal

Bismuth (Bi)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Blue Apatite (Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))) — mineral

Blue Apatite

Chlorapatite / Fluorapatite (Ca5(PO4)3(F,Cl,OH))

mineral
Sandstone (Quartzose) (Arenite (SiO2 based)) — sedimentary

Sandstone (Quartzose)

Arenite (SiO2 based)

sedimentary
Sandstone (Arenite (primarily SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (primarily SiO2 with various cementing agents)

sedimentary
Sandstone (Banded) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

sedimentary
Amethyst (Cabochon) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Cabochon)

Silicon Dioxide (SiO2) with iron impurities

mineral
Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone. (SiO2 (Silicon Dioxide)) — Mineral or Sedimentary (if chert)

Quartz or possibly Jasper/Chert. Looks like a tumbled or water-worn stone.

SiO2 (Silicon Dioxide)

Mineral or Sedimentary (if chert)
Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

mineral
White Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — Mineraloid

White Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Mineraloid
Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Bort or Carbonado (C - Polycrystalline Diamond) — mineral

Bort or Carbonado

C - Polycrystalline Diamond

mineral
Quartz (with iron oxide staining) (Silicon Dioxide (SiO2)) — mineral

Quartz (with iron oxide staining)

Silicon Dioxide (SiO2)

mineral
Sandstone (Arenite (primarily Quartz, SiO2)) — sedimentary

Sandstone

Arenite (primarily Quartz, SiO2)

sedimentary
Snowflake Obsidian (Volcanic Glass with Cristobalite inclusions (70–75% SiO2)) — Igneous

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions (70–75% SiO2)

Igneous
Sandstone (Clastic sedimentary rock (primarily Quartz and Feldspar)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar)

sedimentary
Sandstone (Arenite (composed primarily of SiO2)) — sedimentary

Sandstone

Arenite (composed primarily of SiO2)

sedimentary
River Pebble (likely Quartzite or Quartz) (Quartzite (SiO2)) — metamorphic

River Pebble (likely Quartzite or Quartz)

Quartzite (SiO2)

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Quartz

Quartz (Silicon Dioxide, SiO2)

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

White Quartz (Tumbled)

Silicon Dioxide (SiO2)

mineral