Polished/tumbled jasper, likely ocean jasper or brecciated jasper
Jasper: microcrystalline quartz (SiO₂) with iron oxides and other silicate impurities
mineral
Category
Sedimentary (If Natural Jasper) Or Artificial (If Slag)
Browse sedimentary (if natural jasper) or artificial (if slag) specimens identified by the Rock Identifier community.
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Puddingstone (Jasper Conglomerate)
Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)
Sedimentary
Sandstone
Arenite
sedimentary
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Mixed river-worn rock and mineral collection
Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble
igneous, sedimentary, metamorphic, mineral
Polished ocean jasper / orbicular jasper
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and other mineral inclusions
mineral
Jasper Beads (Polished)
Silicon Dioxide (SiO2)
sedimentary
Tumbled Stones (various)
Mixed Silica-based Minerals (primarily Quartz and Chalcedony)
mineral
Sandstone
Arenite (SiO2 primarily)
sedimentary
Jasper (yellow/cream variety)
SiO₂ (Cryptocrystalline Quartz)
Sedimentary
Petrified Wood with Lichen
Silicified Wood (SiO2) colonized by crustose lichens
fossil
Chert (often called Jasper or River Rock)
Chert (SiO2)
sedimentary
Dalmatian Stone
Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Citrine and Quartz
Silicon Dioxide (SiO2)
mineral
Hag Stone
Perforated Sedimentary Rock (typically Flint, Chert, or Limestone)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 cement)
sedimentary
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety) with Iron Oxide staining
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities
sedimentary
Dalmatian Jasper
Dalmatian Stone (Aplite with Arfvedsonite)
igneous
Dalmatian Stone
Aplite (often incorrectly called Dalmatian Jasper)
igneous
Dalmation Stone
Peralkaline Rock (Microcline Quartz mixture with Arfvedsonite)
igneous
Dalmation Stone
Peralkaline Rock (SiO2 with Arfvedsonite)
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Asphaltum (or Tar)
Silica (SiO2) with natural Bitumen/Asphaltum
sedimentary
Sandstone
Arenite (predominantly SiO2)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (with vugs or solution cavities)
Arenite (primarily Quartz and Feldspar with CaCO3 or SiO2 cement)
sedimentary
Mixed rock and mineral collection
Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks
igneous, sedimentary, metamorphic, mineral
Polished carnelian jasper / brecciated jasper
Microcrystalline quartz (SiO₂), chalcedony with iron-oxide pigments and opaque jasper fragments
gemstone
Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Dalmatian Stone
Peralkaline rhyolite
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Brown Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Small polished brown stone
Indeterminate; possibly tumbled jasper, brown agate, or another iron-stained silicate
mineral
Agate
Agate (a variety of Chalcedony, SiO2)
Mineral
Red Jasper
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Jasper
Jasper (Silica/Silicon Dioxide, SiO2)
sedimentary
Yellow Howlite (Dyed Magnesite/Howlite)
Dyed Ca2B5SiO9(OH)5 (Howlite) or MgCO3 (Magnesite)
mineral
Jasper
Microcrystalline quartz (SiO2)
sedimentary