Ferruginous Sandstone with Quartz Inclusions
Clastic Sedimentary Rock (Iron-rich Sandstone)
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.
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Chert (and Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (with Quartz/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Tan/Buff Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper (River Siltstone)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Agate (Carnelian-Blue Agate mix)
Silicon Dioxide (SiO2)
mineral
Chert (Common Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Jasper or River Siltstone)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Pebble/Conglomerate fragment)
Sandstone (clastic sedimentary rock)
Sedimentary Rock
Chert (often called Flint)
Microcrystalline to cryptocrystalline quartz (SiO2)
sedimentary
Chert (specifically a flint nodule component)
Microcrystalline quartz (SiO2)
sedimentary
Chert (Nodular)
Microcrystalline Silica (SiO2)
sedimentary
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Greenschist (containing Epidote and Quartz)
Greenschist (Epidote-Chlorite-Actinolite Schist)
metamorphic
Chert (Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper (brecciated or orbicular variety)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary/mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Jasper (Chocolate or Brown Jasper)
Silicon Dioxide (SiO2)
sedimentary
Pink Quartzite
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Lavender Quartz (appearing as beads) and Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Chert (also known as Flint or Common Chalcedony)
Cryptocrystalline Silica (SiO2)
sedimentary
Chert (Jasper variety) with Iron Oxide staining
Cryptocrystalline Quartz (SiO2) with Goethite/Limonite impurities
sedimentary
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Milky Quartz (among River Rock)
Quartz (Silicon Dioxide, SiO2)
Mineral
Gneiss
Metamorphic rock of high-grade regional metamorphism
metamorphic
Porphyritic Basalt (Flowerstone)
Porphyritic Basalt (Mafic volcanic rock)
igneous
Chert (specifically a fragment with Desert Varnish)
Microcrystalline quartz (SiO2)
sedimentary
Shale or Argillite
Shale (sedimentary) / Argillite (metamorphic)
Sedimentary or Metamorphic (low-grade)
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Gneiss
Gneiss
metamorphic
Chert (varietal Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary