Tumbled Rose Quartz
Silicon Dioxide (SiO2)
mineral
Category
Man Made Material
Browse man made material specimens identified by the Rock Identifier community.
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Chert (specifically Flint or Dark Chert)
Chert (SiO2)
sedimentary
Diamond (or Cut Gemstone / Cubic Zirconia)
Carbon (C)
gemstone
Banded calcite (travertine/cave calcite)
Calcite, CaCO₃; likely banded carbonate travertine or flowstone
mineral
Siltstone with iron staining
Siltstone (primarily SiO2 with FeO(OH) coatings)
sedimentary
Amethyst crystal cluster
Amethyst, purple quartz (SiO₂) colored mainly by iron impurities and irradiation
mineral
Quartz (worked as a tool or artifact)
Silicon Dioxide (SiO2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Quartzite
SiO2 (Silicon Dioxide)
metamorphic
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Flint / Chert Nodule
Microcrystalline quartz (SiO2)
sedimentary
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Polished serpentine pebble
Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)
metamorphic
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with iron oxide inclusions
mineral
Labradorite-bearing anorthosite
Anorthosite, chiefly plagioclase feldspar (labradorite; approximately (Ca,Na)(Al,Si)₄O₈)
igneous
Yellow jasper (likely ocean jasper or brecciated jasper)
Jasper, microcrystalline quartz (SiO₂) with iron-oxide staining and dark mineral veins
mineral
Crushed Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Granite
Plutonic felsic igneous rock
igneous
Mica Schist
Mica Schist (contains Muscovite/Biotite, Quartz)
metamorphic
Granite
Granite (composed primarily of silica-rich minerals like quartz and feldspar)
igneous
Chert Pebble
Microcrystalline Quartz (SiO2)
sedimentary
Banded Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Pink Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint when dark or worked)
Cryptocrystalline silica (SiO2)
sedimentary
Blue-dyed howlite beads (likely)
Howlite, Ca₂B₅SiO₉(OH)₅, commonly dyed blue to imitate turquoise
mineral
Moss Agate
Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite
Mineral (variety of Chalcedony)
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Greenstone (likely serpentinite)
Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnetite, chlorite, or other altered minerals
metamorphic
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Rounded river cobble, likely basaltic volcanic rock
Fine-grained mafic igneous rock; likely basalt or andesite
igneous
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pink Granite
Phaneritic Felsic Igneous Rock (Granite, rich in Potassium Feldspar)
igneous
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Travertine
Calcareous Tufa / Travertine (CaCO3)
sedimentary
Serpentinite (likely)
Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relic olivine/pyroxene
metamorphic