Agate (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Category
Synthetic Material (Not A Rock Or Mineral)
Browse synthetic material (not a rock or mineral) specimens identified by the Rock Identifier community.
Learn about Synthetic Material (Not A Rock Or Mineral) in the encyclopedia
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Quartz Pebble (with probable inclusions or staining)
Quartz (Silicon Dioxide - SiO2)
mineral
Milky quartz vein rock
Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals
mineral
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (chemical formula: C10H16O)
Organic Gemstone (not a rock or mineral)
Petrified Wood
Silicified Wood (SiO2)
fossil
Vesicular Basalt (Scoria)
Basalt (Extrusive Igneous Rock)
igneous
Basalt with Quartz/Feldspar Vein
Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)
igneous
Thunderegg (Agetized Geode nodule)
Rhyolitic Agate Nodule (SiO2 filling volcanic cavities)
igneous
Petrified Wood
Silicified wood (primarily Quartz, SiO2)
fossil
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Sandstone (Water-worn Cobble)
Arenite (variable composition, primarily SiO2)
sedimentary
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Conglomerate
Conglomerate rock
sedimentary
Sandstone (Ferruginous)
Arenite (complex silicate composition with iron oxides)
sedimentary
Diorite
Diorite (intermediate intrusive igneous rock)
igneous
Sandstone (Ferruginous)
Arenite (with high iron oxide content)
sedimentary
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Red jasper-bearing breccia (probable)
Microcrystalline quartz (SiO₂) with iron-oxide coloration, in a brecciated host
mineral
Moss Agate / Chalcedony
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Slag Glass (Cullet)
Amorphous Silica (Industrial Glass Byproduct)
Synthetic/Byproduct (Non-igneous, non-sedimentary, non-metamorphic)
Sandstone (with Iron Staining)
Arenite (SiO2 predominantly)
sedimentary
Thulite in Matrix
Pink Zoisite - Ca2Al3(SiO4)3(OH)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Gemstone Sand (Mineral Assortment)
Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)
mineral
Tumbled turquoise
Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Slate
Slate (foliated metamorphic rock)
metamorphic
Breccia
Sedimentary Breccia
sedimentary
Red Sandstone
Arenite (Iron-rich Sandstone)
sedimentary
Black Tourmaline (Schorl)
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Slag (Industrial Byproduct)
Artificial silicate/iron byproduct
Mineral description (Anthropogenic material)
Iron-rich weathered rock, likely limonite/goethite-bearing laterite
Limonite (variable hydrated iron oxides; chiefly goethite, α-FeO(OH))
mineral
Chert Breccia
Brecciated Chert (Sedimentary Rock)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide staining (Fe2O3)
sedimentary