Red Jasper (possibly Carnelian)
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
sedimentary
Category
Sedimentary (Secondary Mineral) Within Igneous
Browse sedimentary (secondary mineral) within igneous specimens identified by the Rock Identifier community.
Chert (often called Jasper or River Rock)
Chert (SiO2)
sedimentary
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with Hematite impurities
sedimentary
Chert (Pebble)
Microcrystalline silica (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (SiO₂)
sedimentary
Chert (Jasper variety)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (and Chert-based Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sedimentary
Agate (specifically, likely a geode slice or nodule)
Agate (a variety of Chalcedony, with chemical formula SiO2)
Mineral
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Gneiss (Schistose)
Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Yellow/Tan)
Microcrystalline Quartz (SiO2)
sedimentary
Tektite (Indochinite)
Tektite (Amorphous silica-rich impact glass)
igneous
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Quartz-veined Siltstone/Greywacke
Clastic Sedimentary Rock with Quartz Infill (SiO2 vein)
sedimentary
Chert (Pebble)
Microcrystalline silica (SiO2)
sedimentary
Chert (Red Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Tan/Grey variety)
Silicon Dioxide (SiO2)
sedimentary
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Red Sandstone
Arenite (primarily Quartz and Feldspar with Iron Oxide cement)
sedimentary
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Chert (Yellow Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Magnetite / Iron-Rich Concretion
Magnetite (Fe3O4) or Bog Iron Limonite
mineral
Graphite
Graphite (C)
mineral
Sandstone (Pebble)
Sandstone (arenite, arkose, wacke depending on composition)
sedimentary
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Amethyst
Quartz (Silicon Dioxide) - SiO2
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Granite
Granite (Felsic Plutonic Rock)
igneous
Indigo Gabbro
Gabbro (Mafic Intrusive Rock)
igneous
Granodiorite
Granodiorite
igneous
Granite
Phaneritic intrusive igneous rock (Quartz, Feldspar, Mica)
igneous
Flower Jasper
Agatized Fossil Coral / Chalcedony (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Quartz (likely Milky Quartz or Chalcedony)
Quartz (SiO2 - Silicon Dioxide)
Mineral