Greenschist
Chlorite schist
metamorphic
Category
Mineral, Often Found As Detrital Grains In Sedimentary Rocks
Browse mineral, often found as detrital grains in sedimentary rocks specimens identified by the Rock Identifier community.
Wonderstone (Sandstone)
Silicified Quartz Sandstone with Iron Oxide staining
sedimentary
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Milky or Iron-Stained Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Garnet Rhyolite
Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet
igneous
Chert (Common Opal/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in a Geodic structure
mineral
Jasper with Quartz Veining
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Wood Jasper
Siliceous sedimentary rock (variety of Chert/Chalcedony)
Sedimentary
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
sedimentary
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Schist (Graphite or Mica rich)
Crystalline Schist (often containing Muscovite, Biotite, or Graphite)
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic extrusive volcanic rock with secondary mineral infilling)
igneous
Banded Iron Formation (BIF)
Banded Iron Formation (SiO2 + Fe2O3/Fe3O4)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Banded Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Echinoid Fossil (Sea Urchin Fossil)
Echinoidea (phylum Echinodermata), often preserved as Calcite (CaCO3)
sedimentary
River Cobble (Conglomerate context)
Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)
sedimentary
Yellow Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Quartz Geode (Nodule)
Silicon Dioxide (SiO2)
sedimentary or igneous
Jasper
Jasper (Silicon Dioxide, SiO2 plus iron oxide impurities)
sedimentary
Pegmatite (White Granite variant)
Pegmatitic Granite (Quartz and Feldspar rich)
igneous
Red Jasper
Jasper (Silicate Mineral), SiO2 with Fe2O3 inclusions
sedimentary
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Botryoidal Chalcedony with Calcite
Chalcedony (SiO2 with accessory minerals, likely CaCO3)
Mineral
Chert (Flint)
Chert (microcrystalline quartz)
sedimentary
Diorite (Salt and Pepper Rock)
Diorite
igneous
Red Jasper
Silicon Dioxide with Iron Oxide (SiO2)
sedimentary
Granitic Pegmatite
Granite Pegmatite (coarse-grained intrusive igneous rock)
igneous
Garnet (Pyrope-Almandine series)
Garnet Group, (Mg,Fe)3Al2Si3O12
mineral
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Limestone
Calcium carbonate (CaCO3)
sedimentary
Gneiss (specifically Biotite Gneiss)
Gneiss (high-grade metamorphic rock primarily composed of Silicates)
metamorphic
Jasper
Silicon Dioxide (SiO2)
mineral
Quartz (beads)
SiO2 (Silicon Dioxide)
Mineral
Polished Jasper (Mushroom Carving)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Yellow Jasper)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary