Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Category
Sedimentary Rock (Technically A Microcrystalline Quartz Mineral Aggregate)
Browse sedimentary rock (technically a microcrystalline quartz mineral aggregate) specimens identified by the Rock Identifier community.
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Yellow Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Travertine
Calcium Carbonate (CaCO3)
sedimentary
Chert or flint
Microcrystalline quartz (SiO₂), likely chalcedony-rich chert
sedimentary
Quartz-filled Basalt Geode
Amygdaloidal Basalt with Quartz (SiO2)
igneous
Bauxite
Bauxite (Aluminum Ore)
sedimentary
Bauxite (Laterite)
Hydrated aluminum oxides (Al2O3·nH2O)
sedimentary
Jasper Geode
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz (Chert/Quartzite variant)
Silicon Dioxide (SiO2)
mineral
Druzy Agate (specifically Black Druzy Agate)
Silicon Dioxide (SiO2)
mineral
Crazy Lace Agate
Silicon Dioxide (SiO2) with iron and aluminum inclusions
sedimentary mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled brecciated jasper
Silica-rich microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and other mineral inclusions
mineral
Polished red jasper
Jasper, microcrystalline quartz (SiO₂) colored by iron oxides
metamorphic
Weathered quartz-rich rock fragment
Likely milky quartz–bearing quartzite or silica-rich chert; exact identification requires testing
mineral
Tumbled gray-blue agate/chalcedony
Microcrystalline quartz (SiO₂), likely banded chalcedony or agate
mineral
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Chert (with Quartz Veining)
Microcrystalline Quartz (SiO2)
sedimentary
Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
sedimentary
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Petrified wood
Silicified wood; commonly quartz/chalcedony (SiO₂) replacing organic tissue
fossil
Brecciated jasper (likely red-and-cream jasper)
Jasper, an opaque microcrystalline variety of quartz; primarily cryptocrystalline SiO₂ with iron-oxide staining and possible chalcedony/quartz veining
gemstone
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Black Obsidian
Volcanic Glass (predominantly SiO2, Silicon Dioxide)
igneous
Quartz Pebble (Chalcedony/Chert)
Silicon Dioxide (SiO2)
mineral
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony
mineral
Chert with Quartz Veining
Microcrystalline silica (SiO2)
sedimentary
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Leopard skin jasper (orbicular jasper)
Microcrystalline quartz (SiO₂), commonly with iron-oxide and other silicate inclusions
metamorphic
Granite or granitic rock fragment
Coarse-grained felsic intrusive rock, chiefly quartz, feldspar, and mica/amphibole
igneous
Sandstone (Greywacke)
Arenite / Greywacke Sandstone
sedimentary
Geode (Unopened)
Siliceous Geode (SiO2)
sedimentary
Raw selenite (gypsum)
Gypsum, CaSO₄·2H₂O; translucent variety selenite
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
sedimentary
Amethyst Sage Agate
Silicon Dioxide (SiO2) with trace minerals (Manganese/Iron oxides)
mineral
Dalmatian Stone
Dalmatian Jasper (Aplitic Perthite)
igneous
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Mookaite Jasper
Silicon Dioxide (SiO2) - Radiolarite
sedimentary
Jasper (Imperial Jasper style)
Silicon Dioxide (SiO2) with impurities
sedimentary
River Pebble (Sandstone / Quartzite)
Sedimentary rock (Quartz arenite / Quartzite pebble)
sedimentary
Dragon Blood Jasper
Epidote with Red Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary