Weathered quartz-rich rock, likely milky quartz/quartzite
Quartz (SiO₂), possibly quartzite with minor iron-oxide staining
metamorphic
Category
Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)
Browse sedimentary rock (possibly conglomerate or breccia with a quartz vein) specimens identified by the Rock Identifier community.
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Greisen (Quartz-Muscovite-Turretine Rock)
Greisen
Metamorphic Rock
Quartz-rich pegmatitic rock (likely quartz–feldspar–mica specimen)
Granitic pegmatite; mainly quartz (SiO₂), feldspar, and dark mica/amphibole
igneous
Diorite with Quartz Vein
Intermediate plutonic igneous rock (Diorite / Metagabbro with SiO2 quartz alteration)
igneous
Blue Chalcedony (likely dyed Agate)
Silicon Dioxide (SiO₂)
mineral
Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Green Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Likely weathered chert or flint
Microcrystalline quartz (SiO₂), probably chalcedony/chert
sedimentary
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Milky Quartz (or Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)
Diorite (Igneous rock, intrusive, intermediate composition)
Igneous Rock
Weathered iron-rich rock, likely laterite or ironstone
Ferruginous laterite/ironstone, composed mainly of goethite (FeO(OH)), hematite (Fe₂O₃), and clay minerals
sedimentary
Milky Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Likely citrine pendant
Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz
gemstone
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled orange chalcedony (likely carnelian)
Carnelian, a cryptocrystalline variety of quartz (SiO₂)
gemstone
Galena
Lead Sulfide (PbS)
mineral
Weathered brown stone, possibly basalt or iron-rich sedimentary rock
Indeterminate from photograph; likely fine-grained mafic rock (basalt) or ferruginous sandstone
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Rounded granitic gneiss or granite cobble
Quartz–feldspar–mica granitoid; possibly weathered gneiss
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide) - SiO2
mineral
Jasper or Chert
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Chalcedony)
Microcrystalline Silica (SiO2)
sedimentary
Calcite
Calcite (CaCO3)
mineral
Dark river-worn cobble, possibly basalt or fine-grained volcanic rock
Likely basaltic rock; exact identification requires a fresh surface and tests
igneous
Jasper with Quartz Veins
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz Cobble (River Rock)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky Quartz / Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Matrix
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Orbicular/porphyritic granite or granitic pegmatite
Quartz–feldspar–mica granitic rock, possibly orbicular granite
igneous