Yellow Jasper
Silicon Dioxide (SiO2) with goethite or iron oxide inclusions
sedimentary
Category
Mineral Like Byproduct (Technogenic)
Browse mineral like byproduct (technogenic) specimens identified by the Rock Identifier community.
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Sandstone (Ferruginous)
Arenite (Fe-oxide cemented)
sedimentary
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (SiO2 - Silicon dioxide predominant composition)
Igneous
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and silicate minerals
sedimentary
Mica Schist
Schist (primarily Muscovite and Biotite mica)
metamorphic
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Dyed Agate
SiO2
Mineral
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Mineral
Greenstone / Basalt with Amygdule
Amygdaloidal Basalt (altered to Greenstone)
igneous
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Dendritic Agate / Moss Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Quartz Geode
Quartz (Silicon Dioxide, SiO2) in a Geode
sedimentary
Diorite (Salt and Pepper Rock)
Diorite
igneous
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Epidosite with Quartz (Unakite-variant or Jasper)
Epidotized Metasomatite
metamorphic
River Stone (likely Mudstone or Siltstone)
Lutite (Clastic sedimentary rock composed of clay and silt-sized particles)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 + impurities like Fe3O4)
igneous
Prehnite with Epidote
Prehnite (Ca2Al(AlSi3O10)(OH)2) with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))
mineral
Azurite-Malachite with Limonite
Cu3(CO3)2(OH)2 (Azurite) / Cu2CO3(OH)2 (Malachite)
mineral
Gneiss
Gneiss
metamorphic
Fossilized Bivalve Shell
Bivalvia (Phylum Mollusca)
fossil
Green Jasper
Silicon Dioxide (SiO2) with iron and silicate inclusions
sedimentary
Granite
Granite
Igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Garnet Schist
Almandine-bearing Mica Schist
metamorphic
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Snowflake Obsidian
Obsidian with Cristobalite inclusions (Amorphous SiO2 + SiO2 inclusions)
igneous
Quartz (Milky/Yellowish)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2 with Hematite impurities)
mineral
Vesicular Basalt (River Pebble)
Vesicular Basalt
igneous
Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
mineral
Obsidian
Obsidian (Amorphous volcanic glass, SiO2 rich)
igneous
Fossil bivalve shell
Likely an internal mold or mineralized shell of a brachiopod or small bivalve; exact taxonomy requires locality and diagnostic details
fossil
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2)
igneous
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Obsidian
Volcanic Glass (Amorphous Silica, SiO2)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary