Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Learn about Amorphous Solid in the encyclopedia
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Sandstone
Clastic Sedimentary Rock
sedimentary
Apache Tear
Obsidian (Volcanic Glass)
igneous
Fossilized Coral
Rugosa / Scleractinia (Agatized or Calcitized Coral)
fossil
Chrysocolla in Cuprite / Mixed Copper Ore
Hydrated copper silicate and copper(I) oxide, (Cu,Al)2H2Si2O5(OH)4·nH2O and Cu2O
mineral
Amber
Fossilized Tree Resin
gemstone
Gravel and Pebbles
Unconsolidated rock fragments (clastic sediment)
sedimentary
Black Opal Ring (Carved Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Amber
Succinite (Fossilized Tree Resin)
gemstone
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Black Chert (Flint / Basanite)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Limonite
FeO(OH)•nH2O
mineral
Ferrochrome Slag
Calcium-Aluminium-Magnesium Silicate Slag
industrial byproduct
Apache Tear
Obsidian (Natural volcanic glass)
igneous
Limonite / Iron Oxide Concretion
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Obsidian
Volcanic Glass
igneous
Fossilized Echinoid / Sea Urchin Internal Mold
Echinoidea internal cast (steinkern)
fossil
Septarian Nodule
Septarian Concretion (Calcite, Aragonite, Limestone)
sedimentary
Chrysocolla in Quartz
Hydrated copper phyllosilicate with silicon dioxide (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O + SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Tektite (Indochinite)
Impactite (Natural Glass)
meteorite
Obsidian
Obsidian (Volcanic Glass)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chrysocolla
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Conglomerate
Clastic sedimentary rock (composed mostly of SiO2)
sedimentary
Bog Iron (Limonite Concretion)
Limonite (FeO(OH)·nH2O)
sedimentary
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Sandstone (Ferruginous/Banded)
Clastic Terrigenous Sandstone (SiO2 with Fe2O3 cement)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone / Ironstone (FeO(OH)·nH2O)
sedimentary
Black Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide) with impurities
igneous
Limonite (Iron Ore)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Tumbled Obsidian
Volcanic Glass (Silicon Dioxide)
igneous
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Coquina (Fossiliferous Limestone)
Coquina (Organic Clastic Limestone)
sedimentary
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous