Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Category
Mineral With Artificial Coating
Browse mineral with artificial coating specimens identified by the Rock Identifier community.
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River Stone (Sandstone with Oxide Banding)
Arenite with Iron/Manganese Oxide inclusions
sedimentary
Green Slate (Greenstone)
Foliated Metamorphic Rock (rich in Chlorite/Epidote)
metamorphic
Stichtite in Serpentine (Atlantasite)
Mg6Cr2CO3(OH)16·4H2O in Mg3Si2O5(OH)4
metamorphic
Unopened Geode
Geode (containing various mineralization like Quartz SiO2)
sedimentary
Granite / Quartz Vein Rock
Granitoid with Quartz (SiO2)
igneous
Diamond (or Simulant)
Carbon (C)
gemstone
Amethyst
Amethyst (Silicon Dioxide, SiO2 + trace Fe3+)
mineral
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
sedimentary
Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Septarian Nodule Geode
Septarian concretions (composed of Calcite, Aragonite, and Limestone)
sedimentary
Sandstone with Quartz Vein
Arenite with hydrothermal quartz intrusion
sedimentary
Granite / Quartz with Mica inclusion
Granite (Plutonic Igneous Rock)
igneous
Basalt River Pebble (with possible Pyrite/Mineralization)
Basalt (Mafic volcanic rock)
igneous
Fossilized Shark Tooth
Carcharodon carcharias or similar Lamniformes ancestor (fossilized hydroxylapatite replaced by minerals)
fossil
Sandstone (Micaceous)
Clastic Sedimentary Rock - Micaceous Litharenite (SiO2 principal)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone with Iron Oxide Concretion
Arenite with Hematite/Goethite Concretion
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and silicate minerals
sedimentary
River Pebble (Graywacke/Sandstone)
Lithic Sandstone
sedimentary
Vuggy Quartz / Chert
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Basalt with Iron Oxide staining
Basalt (Mafic volcanic rock)
igneous
Basalt with Quartz Veins
Basalt (SiO2 range 45-52%)
igneous
Basalt with Calcite Veining
Aphanitic Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with CaCO3 veins
igneous
Chert with Calcite Veins
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions
sedimentary
Sandstone Concretion
Sandstone (Sedimentary Rock) with silica or calcite cement
sedimentary
Sandstone
Arenite (primarily Quartz chemical formula SiO2)
sedimentary
Mocha Stone (Dendritic Agate)
Silicon Dioxide (SiO2) with Manganese/Iron inclusions
sedimentary
Sandstone
Sandstone (Silicon Dioxide, SiO2)
sedimentary
Chert
Chert (SiO2)
sedimentary
Conglomerate
Conglomerative Rudite (SiO2/CaCO3 matrix)
sedimentary
Chert (Nodule)
Cryptocrystalline Quartz (SiO2)
sedimentary
Amethyst and Green Aventurine (Tumbled Gemstones set in a wand)
Quartz (SiO2) varieties - Amethyst and Aventurine
gemstone
Serpentine
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite)
igneous
Basalt with Quartz/Calcite Veining
Basalt (principally Plagioclase and Pyroxene)
igneous
Gneiss
Gneiss
metamorphic
Limonite / Ironstone
FeO(OH)·nH2O
sedimentary
Serpentine
Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4
metamorphic
Chrysocolla (Copper Ore)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral