Chert (Nodular)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral (Or Mineraloid If Microcrystalline)
Browse mineral (or mineraloid if microcrystalline) specimens identified by the Rock Identifier community.
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Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Chalcedony (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Banded Sedimentary Rock
Sedimentary Rock with Quartz/Feldspar Vein
sedimentary
Quartz (or Chert/Flint)
Silicon Dioxide (SiO2)
mineral
Jasper or Agate
Silicon dioxide (SiO2)
Mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Geode Nodule Fragment
Quartz / Chalcedony Nodule
sedimentary
Shark Tooth Fossil
Vertebrate fossilized tooth
fossil
Polished brecciated jasper
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and silica vein infill
mineral
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Agate Nodules
Cryptocrystalline Quartz (SiO2)
mineral
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Red jasper (likely tumbled jasper/chert)
Microcrystalline quartz, SiO₂, colored red by iron oxides; exact identification from the photo is uncertain.
sedimentary
Brown chert or jasper pebble
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chert/jasper
sedimentary
Polished red jasper beads
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Banded Agate
Silicon Dioxide (SiO2) - Chalcedony Variety
mineral
Tumbled orbicular jasper (probable)
Jasper, microcrystalline quartz (SiO₂), with iron- and clay-rich inclusions
mineral
Polished orbicular jasper (likely ocean jasper)
Jasper, a microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions
mineral
Polished brown jasper pebble
Microcrystalline quartz (SiO₂), commonly iron-oxide-rich jasper
mineral
Tumbled jasper
Microcrystalline quartz (SiO₂), colored by iron oxides and other impurities
mineral
Polished orbicular jasper (likely ocean jasper)
Jasper, microcrystalline quartz (SiO₂), with iron-oxide and volcanic-mineral inclusions
mineral
Rhyolitic jasper / brecciated jasper
Silica-rich volcanic rock, chiefly microcrystalline quartz (SiO₂), with iron-oxide and clay/mineral impurities
igneous
Tumbled brown jasper
Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities
metamorphic
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Leopard Skin Jasper
Silicon Dioxide (SiO2) with various inclusions
sedimentary
Opalite
Synthetic Opalized Glass
mineraloid (man-made)
Poppy Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Quartz (Chert/Chalcedony flake)
Silicon Dioxide (SiO2)
mineral
Red jasper (likely)
Microcrystalline quartz, SiO₂, colored red by iron oxides
mineral
Agate
SiO2
Mineral
Red jasper
Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides
mineral
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Tumbled red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Chalcedony (Agate Nodule)
Silicon Dioxide (SiO2)
mineral
Leopard Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
mineral
Geode
Quartz nodule / Chalcedony-lined cavity
sedimentary