Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Category
Sedimentary Rock (Possibly Composed Of Various Minerals)
Browse sedimentary rock (possibly composed of various minerals) specimens identified by the Rock Identifier community.
Learn about Sedimentary Rock (Possibly Composed Of Various Minerals) in the encyclopedia
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Jasper with Epidote (Unakite-related)
Epidotized Quartzite (composed of Quartz, Epidote, and Feldspar)
metamorphic
Red Granite
Phaneritic Felsic Igneous Rock
igneous
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Ferruginous Sandstone
Arenite with Iron Oxide matrix (Fe2O3)
sedimentary
Quartz-rich metamorphic fragment (likely mica schist)
Mica schist, probably muscovite–quartz schist
metamorphic
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Siltstone
Siltstone (primarily composed of silica and clay minerals)
sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Gray slate
Slate; fine-grained foliated metamorphic rock composed mainly of mica and quartz
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Weathered quartz-rich sandstone or quartzite
Quartzite (predominantly SiO₂), possibly strongly cemented sandstone
metamorphic
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Red Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2)
sedimentary
Pebble (likely Quartzite or Chert)
Clastic Sediment, potentially composed of SiO₂ (Quartz)
Mineral, Sediment
Quartz
Silicon Dioxide (SiO2)
mineral
Desert Rose (Gypsum Variety)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Weathered chert or jasper nodule
Microcrystalline quartz (SiO₂), likely chalcedony/jasper with iron-oxide staining
sedimentary
Quartz (likely Clear Quartz or Rock Crystal)
Quartz (SiO2)
Mineral
Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Tooth or shell fragment (likely fossilized marine material)
Indeterminate; possibly a fossil fish tooth or mollusk shell fragment composed mainly of calcium carbonate (CaCO₃)
fossil
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Chrysocolla in Matrix
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Silicate/Secondary Copper Mineral)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and clay impurities
sedimentary
Quartz crystal
Quartz (silicon dioxide, SiO₂), possibly milky quartz
mineral
Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Sandstone
Arenite (SiO2 based with various cements)
sedimentary
Epidote
Epidote (Ca2(Al2,Fe3+)3(SiO4)3(OH))
metamorphic
Weathered quartz-rich rock, likely quartzite or quartz vein
Quartzite; predominantly quartz (SiO₂), possibly iron-oxide stained
metamorphic
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Dalmatian Stone and Lapis Lazuli
Dalmatian Stone (Felsic Igneous Rock) with Lapis Lazuli
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous