Diamond
Carbon (C)
gemstone
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
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Clear Quartz (beads in a bracelet)
Quartz (SiO2)
Mineral
Engineerged Quartz (Quartz Composite)
SiO2 (Silicon Dioxide) in a polymer resin matrix
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Sandstone
Arenite (primarily SiO2)
sedimentary
Likely weathered river pebble
Indeterminate lithology; possibly fine-grained sandstone, siltstone, or chert
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium aluminum silicate)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Quartz / Common Opal
Silicon Dioxide (SiO2)
mineral
Limonite Geode / Ironstone Nodule
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
mineral
Citrine Quartz
Citrine (Silicon Dioxide - SiO2)
Mineral
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Granite (Weathered)
Phaneritic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Obsidian (Black Obsidian)
Obsidian (Volcanic Glass)
igneous
Geode / Fossilized Gastropod or Shell Cast
Silicon dioxide (Quartz) replacement / fossil mold
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic Intrusive Igneous Rock
igneous
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Granite Pebble
Granite
igneous
Limonite (Yellow Ochre)
Hydrated Iron Oxide (FeO(OH)·nH2O)
mineral
Malachite
Copper carbonate hydroxide - Cu2CO3(OH)2
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Hag Stone
Perforated Sedimentary Rock (Typically Limestone or Sandstone)
sedimentary
Citrine
Silicon Dioxide (SiO2)
gemstone
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Pearl (Pendant)
Calcium Carbonate (Aragonite/Calcite) - CaCO3
gemstone
Sandstone
Arenite
sedimentary
Amethyst and Rose Quartz Beads
Crystalline Quartz (SiO2) with trace elements
gemstone
Brecciated Jasper
SiO2 (Silicon Dioxide)
sedimentary
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Tumbled yellow-brown translucent stones, likely quartz/chalcedony
Quartz (SiO₂) or microcrystalline quartz (chalcedony); exact identification requires testing
mineral
Snowflake Obsidian
Volcanic Glass (spherulitic obsidian)
igneous