Schist
N/A (a rock type, not a mineral formula)
metamorphic
Category
Sedimentary Rock (Specifically A Clastic Sedimentary Rock Formed Into A Cobble)
Browse sedimentary rock (specifically a clastic sedimentary rock formed into a cobble) specimens identified by the Rock Identifier community.
Chert (specifically Flint or Jasper variant)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (specifically Jasper/Carnelian variety)
Microcrystalline quartz (SiO2)
sedimentary
Amber
Succinite (specifically for Baltic amber; fossilized tree resin)
Organic (Sedimentary-associated)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock transitioned to metamorphic)
metamorphic
Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
mineral
Banded Chert in Matrix
Microcrystalline Quartz (SiO2)
sedimentary
Biotite Mica
Biotite, K(Mg,Fe)3AlSi3O10(F,OH)2
mineral
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite)
Metamorphic rock
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron oxide impurities
sedimentary (chemical)
Banded Gneiss
Gneiss (pronounced 'nice')
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Jasper
Jasper (a variety of Chalcedony, SiO2)
Mineral
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Chert (specifically Chalcedony/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Tan Chert)
Chert (SiO2)
sedimentary
Chalcedony (specifically Agate or Flint)
Silicon Dioxide (SiO₂)
Mineral
Jasper (specifically Yellow and Red Jasper/Chert)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Quartzite Beach Pebble
Quartzite (primarily SiO2)
metamorphic
Coquina with Shell Fragment
Bioclastic Limestone (composed primarily of CaCO3)
sedimentary
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral
Red Jasper (Opaque Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Bumblebee Jasper
Fossiliferous Volcanic Rock (composed of Calcium Carbonate, Manganese Oxides, and Arsenic Sulfides)
igneous
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Mineraloid
Amber
Succinite (specifically for Baltic amber); Fossilized Tree Resin (C10H16O)
Organic Mineraloid
Grey Slate
Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)
metamorphic
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Slate with Red Sandstone Landscaping Rock
Foliated Pelitic Metamorphic Rock (Slate) and Ferruginous Sandstone
metamorphic and sedimentary
Coquina
Bioclastic Limestone
sedimentary
Diamond Drill Core (Greenschist and Quartzite)
Chlorite Schist / Meta-quartzite (Metamorphic Rock Core Sample)
metamorphic
Jasper (specifically Yellow/Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Puddingstone (Jasper Conglomerate)
Jasper Conglomerate (SiO2 matrix with Fe2O3 inclusions)
sedimentary
Red Siltstone
Siltstone (primarily quartz and feldspar sized 0.0039 to 0.0625 mm)
sedimentary
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Druzy Quartz on Chert/Chalcedony
Silicon Dioxide (SiO2)
mineral