Rock Identifier

Category

Mineral Like (Natural Glass)

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

Learn about Mineral Like (Natural Glass) in the encyclopedia

Obsidian

Black Obsidian

Macusanite

Baddeleyite

Green Obsidian

Blue Obsidian

Maskelynite

Midnight Obsidian

Sideromelane

Yellow-Green Obsidian

Yellow-Green Obsidian

Pink Obsidian

Perlite

Healer's Gold (Iron-Stained Quartz Cluster) (Silicon Dioxide with Iron Oxide Coating (SiO2)) — mineral

Healer's Gold (Iron-Stained Quartz Cluster)

Silicon Dioxide with Iron Oxide Coating (SiO2)

Yellow Ochre / Limonite (Limonite (FeO(OH)·nH2O)) — Mineral

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Moldavite (SiO2 (+ Al2O3, FeO, K2O) - Natural Tektite Glass) — gemstone

Moldavite

SiO2 (+ Al2O3, FeO, K2O) - Natural Tektite Glass

Granite (Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O) — igneous

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Obsidian (likely blue-sheen or coated obsidian) (Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)) — igneous

Obsidian (likely blue-sheen or coated obsidian)

Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Mica (Muscovite) (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Mica (Muscovite)

Muscovite (KAl2(AlSi3O10)(OH)2)

Sandstone (Pebble) (Sandstone (SiO2 dominated with minor feldspar/clay)) — sedimentary

Sandstone (Pebble)

Sandstone (SiO2 dominated with minor feldspar/clay)

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

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (various varieties) (SiO₂ (Silicon Dioxide)) — Mineral

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Limonite (Iron Stone/Iron Ore) (FeO(OH)·nH2O (Hydrous ferric oxide)) — mineral

Limonite (Iron Stone/Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Native Copper (in coinage alloy) (Copper (Cu)) — mineral

Native Copper (in coinage alloy)

Copper (Cu)

Shale (Shale (comprised mostly of clay minerals and quartz)) — sedimentary

Shale

Shale (comprised mostly of clay minerals and quartz)

Chert / Flint Nodule (Cryptocrystalline quartz (SiO2)) — sedimentary

Chert / Flint Nodule

Cryptocrystalline quartz (SiO2)

Shale (Mudstone/Shale) — sedimentary

Shale

Mudstone/Shale

Turquoise in Matrix (Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise in Matrix

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Goldstone (Brown) (Aventurine Glass (Silicon Dioxide infused with Copper crystals)) — mineraloid (man-made glass)

Goldstone (Brown)

Aventurine Glass (Silicon Dioxide infused with Copper crystals)

mineraloid (man-made glass)

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

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

Blue chalcedony (likely dyed or coated) (Chalcedony, microcrystalline quartz (SiO₂)) — mineral

Blue chalcedony (likely dyed or coated)

Chalcedony, microcrystalline quartz (SiO₂)

Diamond (or Diamond Simulant) (Carbon (C)) — gemstone

Diamond (or Diamond Simulant)

Carbon (C)

Howlite (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

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

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Greenstone with Epidote or Quartz veins (Metabasalt (Greenstone facies)) — metamorphic

Greenstone with Epidote or Quartz veins

Metabasalt (Greenstone facies)

Sandstone (River Cobble) (Sandstone (composed predominantly of SiO2 - Quartz)) — sedimentary

Sandstone (River Cobble)

Sandstone (composed predominantly of SiO2 - Quartz)

Silver (Native or Alloyed) (Ag (Argentum)) — mineral

Silver (Native or Alloyed)

Ag (Argentum)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Peacock Ore (Bornite or Chalcopyrite treated with acid) (Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)) — mineral

Peacock Ore (Bornite or Chalcopyrite treated with acid)

Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)

Diamond (Set in Jewelry) (C (Native Carbon)) — mineral

Diamond (Set in Jewelry)

C (Native Carbon)

Green Sea Glass (Man-made vitreous material (silica glass)) — gemstone

Green Sea Glass

Man-made vitreous material (silica glass)

Granite (Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)) — igneous

Granite

Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

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

Raw Citrine (Yellow Quartz)

Citrine / Silicon Dioxide (SiO2)

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

Rough Amethyst

Silicon Dioxide (SiO2) with Iron impurities

Onyx (Black Onyx) (Onyx (Silicon Dioxide, SiO2)) — mineral

Onyx (Black Onyx)

Onyx (Silicon Dioxide, SiO2)

Tumbled jasper or brecciated jasper (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions) — mineral

Tumbled jasper or brecciated jasper

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and dark mineral inclusions

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Peacock Ore (Chalcopyrite) (Chalcopyrite (CuFeS2)) — mineral

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Diamond

Diamond (pure Carbon, C)

Amethyst (Tumbled) (Purple Quartz (SiO2 with iron impurities and irradiation)) — mineral

Amethyst (Tumbled)

Purple Quartz (SiO2 with iron impurities and irradiation)

Gneiss (Metamorphosed Granitic Rock) (Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)) — metamorphic

Gneiss (Metamorphosed Granitic Rock)

Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)