Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Category
Mineral, Often A Rock Given Its Aggregate Nature
Browse mineral, often a rock given its aggregate nature specimens identified by the Rock Identifier community.
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (with Quartz Vein)
Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)
sedimentary
Granite (White Granite variant)
Phaneritic Plutonic Rock (High-silica Felsic)
igneous
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
Conglomerate
Clastic sedimentary rock (Polymictic Conglomerate)
sedimentary
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Turquoise (Green variety)
Hydrous phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
River Chalcedony / Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Granite
Phaneritic Acidic Igneous Rock (Granite)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Druzy Quartz (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Chert / River Pebble
Microcrystalline Silica (SiO2)
sedimentary
Eclogite
Eclogite (Omphacite + Pyrope)
metamorphic
Biotite (Mica)
Biotite group (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Sandstone (Quartz-rich)
Arenite (SiO2 based clastic rock)
sedimentary
Jasper
Jasper / Silicon Dioxide (SiO₂)
sedimentary
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
sedimentary
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Milky Quartz (Beach Pebble)
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Milky Quartz/Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Pink Granite
Phaneritic intrusive igneous rock (K-feldspar rich)
igneous
Red Tiger's Eye beads
Tiger's Eye (variety of Chalcedony, SiO2)
Mineral / Gemstone (variety of Quartz)
Basalt
Basalt (Phaneritic/Aphanitic Mafic Igneous Rock)
igneous
Lapis Lazuli (Tumbled)
Lazurite-dominated contact metamorphic rock
metamorphic
Banded Agate (Orca Agate)
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Basalt with Limonite stains
Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)
igneous
Granite
Granite (a common type of Felsic Intrusive Igneous Rock)
Igneous Rock
Sandstone (Red)
Arenite (primarily SiO2 with Iron Oxide staining)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Ruby in Fuchsite
Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)
Mineral
Agate
Silicon Dioxide (SiO2)
mineral
Basalt (with possible quartz veinsing)
Basalt
igneous
Sandstone (Ferruginous)
Sandstone (SiO2 with iron oxide inclusions)
sedimentary
Clear Quartz Cluster
Silicon Dioxide (SiO2)
mineral
Schorl (Black Tourmaline) in Matrix
Sodium Iron Aluminum Borosilicate Hydroxide (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)
mineral
Sandstone (Quartz-rich)
Arenite (primarily SiO2)
sedimentary