Chert (varietal Flint or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Mineral Within Sedimentary Rock
Browse mineral within sedimentary rock specimens identified by the Rock Identifier community.
Chert (Yellow Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Arkosic Sandstone (or Conglomeritic Sandstone fragment)
Arkose (rich in feldspar)
sedimentary
Sodalite
Sodalite (Na4Al3Si3O12Cl)
Mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Chert (Quartz)
Microcrystalline Silica (SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata
sedimentary
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Chert / Flint
Microcrystalline or cryptocrystalline quartz (SiO2)
sedimentary
Amethyst
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Mineral
Zebra Rock / Zebra Marble
Banded Limestone-Marble Transition
metamorphic
Quartz (likely) or a Quartzite Pebble
Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.
Mineral, specifically a detrital grain
Amethyst
Amethyst (Silicon Dioxide - SiO2 with ferric impurities)
mineral
Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary
Weathered Volcanic Rock (possibly Rhyolite or Andesite Pebble)
Volcanic rock (e.g., Rhyolite or Andesite, specific identification would require thin section analysis or chemical assay). Mineral composition: Primarily feldspars (orthoclase and/or plagioclase), quartz (in rhyolite), micas, amphiboles, and sometimes pyroxenes.
Igneous, specifically volcanic/extrusive (possibly Rhyolite or Andesite)
Chert (and/or Chalcedony)
Microcrystalline Silica (SiO2)
sedimentary
Chert (Pebble)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Red Chert (Jasper)
Cryptocrystalline Quartz (SiO2) with iron oxide inclusions
sedimentary
Oolitic Limestone (Egg Stone)
Oolite (Chemical sedimentary rock, primarily CaCO3)
sedimentary
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Chert (with Limestone matrix)
Microcrystalline Quartz (SiO2)
sedimentary
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Amethyst
Silicon Dioxide with trace inclusions of Iron (SiO2)
mineral
Included Quartz (Garden Quartz / Lodolite)
Quartz (SiO2) with various mineral inclusions
Mineral
Yellow Quartzite or Yellow Jasper
Quartzite (primarily SiO2 with Iron oxide staining)
metamorphic
Quartz (pebble)
Quartz (SiO₂)
Mineral
Glauconitic Sandstone
Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
Mineral / Sedimentary component
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Ammonite Fossil in Limestone Matrix
Ammonoidea (subclass) in Calcium Carbonate (CaCO3)
sedimentary
Siltstone with flute casts or scratch marks
Clastic Sedimentary Rock (Siltstone/Fine-grained Sandstone)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Coquina
Bioclastic Limestone
sedimentary