Schist
Mica Schist (Metamorphic Rock)
metamorphic
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Jasper
Silicon Dioxide (SiO2)
sedimentary
Banded gneiss
Quartz–feldspar–biotite gneiss (exact minerals uncertain from the photo)
metamorphic
Banded metamorphic rock, likely gneiss or banded amphibolite
Quartz–feldspar–biotite gneiss or amphibolite; exact identification requires thin-section or mineral tests
metamorphic
Chalcedony
Silicon Dioxide (SiO2)
mineral
Iron-oxide-stained jasper or weathered ironstone
Microcrystalline quartz (SiO₂) with hematite/goethite and probable clay minerals
mineral
Fossilized coral or carbonate fossil fragment
Calcareous fossil, likely colonial coral (order Hexacorallia; uncertain from image)
fossil
Small rounded pebble, likely quartz-rich stone
Indeterminate from photograph; possibly microcrystalline quartz (SiO₂) or a weathered silicate pebble
mineral
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Blue-green tumbled mineral specimen
Indeterminate; possibly chrysocolla, turquoise, or azurite–malachite material
mineral
Iron-stained quartz vein in host rock
Quartz (SiO₂), with iron-oxide staining; host rock is uncertain from the image
mineral
Granite
Coarse-grained felsic intrusive igneous rock, typically quartz + alkali feldspar + plagioclase + biotite/hornblende
igneous
Polished garnet bead (likely almandine)
Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)
gemstone
Chert (Agatized)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Iron-stained weathered rock
Unknown
Unknown (likely sedimentary or metamorphic)
Quartz with Chlorite inclusions
SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2⋅(Mg,Fe)3(OH)6
mineral
Rose Quartz
Silicon dioxide, SiO2
mineral
Agate
Cryptocrystalline Quartz, SiO2
mineral
Spinosaurus Tooth Fossil
Spinosaurus aegyptiacus (Calcium Phosphate/Apatite)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Vein Quartz in Basalt or Chert
Silica-veined dark lithic rock (Quartz veins in microcrystalline matrix)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Copper-bearing Quartz Vein in Host Rock
Quartz with Malachite/Chrysocolla staining
igneous/metamorphic with mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Rugose Coral Fossil
Rugosa (Order)
sedimentary
Asphalt (Road Aggregate)
Bituminous Conglomerate / Asphalt Concrete
Anthropogenic (Man-made)
Weathered iron-rich quartz vein in altered host rock
Goethite–hematite limonite with quartz and iron-oxide alteration
metamorphic
Weathered quartz-rich sandstone or granitic rock
Indeterminate; likely iron-stained quartz sandstone, possibly weathered granite
sedimentary
Basalt (with possible weathering)
Basalt
igneous
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Lightning Stone / Fulgurite-impregnated or Septarian-like Agate
Silicon dioxide (Quartz/Chalcedony) with host rock matrix
sedimentary
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz-rich blue mineral specimen, possibly blue quartz or chrysocolla-bearing quartz
Quartz (SiO₂), with unidentified blue secondary mineral or inclusions
mineral
Quartz (or Chalcedony) Specimen
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Chert (Cherty Limestone or Flint)
Microcrystalline Silica (SiO2)
sedimentary
Quartz (Field Specimen)
Silicon Dioxide (SiO2)
mineral