Sandstone (Quartzose)
Arenite (composed primarily of SiO2)
sedimentary
Category
Sedimentary (Secondary Classification: Cryptocrystalline Quartz)
Browse sedimentary (secondary classification: cryptocrystalline quartz) specimens identified by the Rock Identifier community.
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Mookaite Jasper
Siliceous sedimentary rock (variety of Jasper/Chert)
Sedimentary Rock
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3)
Organic Gemstone (Sedimentary classification)
Limestone (with Calcite Veining)
Calcium Carbonate (CaCO3)
sedimentary
Carnelian
Carnelian (SiO2 - Silicon Dioxide)
mineral
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Basalt with Quartz Veining
Basalt (Mafic Volcanic Rock with SiO2)
igneous
Quartz (pebble)
Quartz (SiO₂)
Mineral
Painted Pet Rock (Quartzite/Sandstone base)
Silicon Dioxide (SiO2) with anthropomorphic acrylic embellishments
sedimentary
Limonite/Ironstone
Limonite (Hydrous ferric oxides), FeO(OH)·nH2O
sedimentary
Limonite (Iron Ore)
Limonite (̑FeO(OH)·nH₂O)
sedimentary
Septarian Nodule (Yellow Calcite in Limestone)
Septarian Concretion (CaCO3 with Aragonite and Calcite)
sedimentary
Limonite (often after Hematite or Goethite)
Limonite (FeO(OH)·nH2O)
mineral
White Quartz (Milky Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Chert (or Flint)
Chert (Sedimentary Cryptocrystalline Sio2)
sedimentary
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Basalt with Amygdule
Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill
igneous
Native Gold Nugget
Native Gold (Au)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Basalt (with possible Calcite/Quartz veining)
Afanitic Mafic Igneous Rock
igneous
Jasper (Tumbled)
Silicon Dioxide (SiO₂)
sedimentary (cryptocrystalline quartz)
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Tuff with Quartz and Calcite Veining
Lithic Tuff (Silicified)
igneous
Chert on Volcanic Host Rock
Sedimentary Chert (SiO2) within Basalt or Andesite
sedimentary
Iron-stained Milky Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Limonite-stained Granite
Felsic Plutonic Rock with Hydrated Iron Oxides
igneous
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite containing Azurite)
igneous
Agate
Silicon Dioxide (SiO2) - Chalcedony variant
mineral
Siltstone with Weathering Crust
Siltstone (primarily SiO2 with Al2O3)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)
sedimentary
Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Carnelian
SiO2 (Silicon Dioxide) - Translucent Chalcedony
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Petrified Wood
Silicified Wood (SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
mineral