Hematite Mineral Ore
Iron(III) oxide (Fe2O3)
mineral
Category
Sedimentary (Volcanic)
Browse sedimentary (volcanic) specimens identified by the Rock Identifier community.
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Chalcedony (Agate/Chert)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Carnelian (Red Agate)
Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Green Chalcedony
Silicon Dioxide (SiO2) with trace minerals
mineral
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Dendritic Agate or Tree Agate
Silicon Dioxide (SiO2) with impurities of manganese or iron oxide
mineral
Aura Quartz Geode
Titanium/Gold bonded Quartz (SiO2 with metallic coating)
mineral
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Carnelian
Carnelian (Silicon Dioxide, SiO2)
mineral
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Mixed collection of minerals and rocks (Jasper, Carnelian, Granite, and Quartz)
Silicon Dioxide (SiO2) with varying impurities for silicates and igneous aggregates
igneous, sedimentary, and metamorphic
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
mineral
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides (Goethite)
sedimentary
Polished red jasper (likely brecciated jasper)
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Calcareous or Siliceous Matrix
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Porphyritic basalt (vesicular basalt)
Basalt; fine-grained mafic rock, commonly composed of plagioclase, clinopyroxene, olivine, and iron-titanium oxides
igneous
Pale blue-gray chalcedony (probable)
Microcrystalline quartz, SiO₂; possibly common chalcedony or quartz-rich volcanic rock
mineral
Polished jasper pebble
Microcrystalline quartz (SiO₂), commonly iron-stained jasper/chert
mineral
Yellow Agate
Silicon Dioxide (SiO2)
gemstone
Pyrite-rich Volcanic Rock
Iron Disulfide (FeS2) in Volcanic Matrix
igneous
Red Jasper
Jasper (Silica/Microcrystalline Quartz with Hematite inclusions), SiO2
sedimentary
Chert (Jasper/Common Opal transition)
Microcrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Red jasper pebble
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Dalmatian Stone
Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)
igneous
Polished leopard-skin jasper
Jasper (microcrystalline quartz, SiO₂), commonly orbicular or brecciated varieties
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Agate
Chalcedony (SiO2)
mineral
Unidentified Dark Mineral or Rock
Indeterminate (Likely Silicon Dioxide or Carbon-based)
mineral
Red jasper (likely tumbled or naturally worn)
Jasper, microcrystalline quartz/chalcedony (SiO₂), colored mainly by iron oxides
mineral
Red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Tumbled carnelian/chalcedony
Carnelian, orange-red microcrystalline quartz (SiO₂), a variety of chalcedony
gemstone
Polished red jasper (likely brecciated or orbicular jasper)
Jasper, microcrystalline quartz (SiO₂), colored mainly by iron oxides
mineral
Tumbled carnelian
Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)
gemstone
Blue Onyx (Dyed Agate)
Cryptocrystalline Quartz (SiO2) with artificial pigment
mineral
Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Quartz Geode
Silicon Dioxide (SiO2) in Geode form
mineral
River Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary