Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Metamorphic
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Diamond (appearing in jewelry)
Diamond (pure Carbon, C)
mineral
Diamond
C (Native Carbon)
mineral
Blue Agate (Dyed Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
Turquoise
Hydrate phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz Vein in Gneiss or Schist
Silicon dioxide (SiO2) within metamorphic host rock
metamorphic
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Sedimentary silica (SiO2)
sedimentary
Banded Agate
Silicon Dioxide (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Agate (Laguna or Lace variety pattern)
Silicon Dioxide (SiO2)
mineral
Ruby in Kyanite
Corundum in Disthene (Al2SiO5 + Al2O3)
metamorphic
Agate with Quartz Druzy
Silicon Dioxide (SiO2) - Microcrystalline and Macrocrystalline varieties
mineral
Tumbled red jasper
Jasper, microcrystalline quartz (SiO₂), commonly colored by iron oxides
mineral
Banded Slate
Metamorphic Argillite / Slate
metamorphic
Granite
Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)
igneous
Chert (often called Flint in archaeological contexts)
Microcrystalline or cryptocrystalline Silica (SiO2)
sedimentary
Coral Skeleton (Scleractinia)
Aragonite (CaCO3) biomineralisation within Anthozoa
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pink Granite Pebble
Granite (Phaneritic igneous rock)
igneous
Granite Pebble
Granite (phaneritic igneous rock)
igneous
Hematitic Sandstone
Sandstone with Iron Oxide (Hematite) staining
sedimentary
Painted Pet Rock (Quartzite/Sandstone base)
Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments
sedimentary
Sedimentary Sandstone (Sandstone Slab)
Arenite (SiO2 with Fe2O3 staining)
sedimentary
Chert with Limestone matrix
Microcrystalline silica (SiO2) in Calcite (CaCO3) matrix
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeO oxides)
sedimentary
Porphyritic Basalt or Andesite
Porphyritic Basalt/Andesite
Igneous
Granite
Intrusive igneous rock (high SiO2)
igneous
Quartz with Schist Inclusion
Quartz (SiO2) with micaceous schist inclusions
metamorphic
Blue Lace Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Flint / Chert (Beach-worn Pebble)
Microcrystalline quartz (SiO2)
sedimentary
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Arenite (SiO2 based clastic rock)
sedimentary
Ferruginous Quartz
Quartz (Silicon Dioxide) - SiO2 with Iron Oxide inclusions
mineral
Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
mineral
Quartz with Mica inclusions (Pegmatite)
Silicon Dioxide (SiO2) with Muscovite/Biotite inclusions
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Chert Arrowhead and Quartz Specimen
Silicon Dioxide (SiO2)
mineral
Jasper with Quartz Veining
Microcrystalline quartz (SiO2) with iron oxide impurities
sedimentary
Calcite–fluorite mineral specimen with iron-oxide staining
Calcite (CaCO₃), likely fluorite (CaF₂), with possible quartz and iron/manganese oxides
mineral