Sandstone
Sedimentary Rock (Quartz Arenite)
sedimentary
Category
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Sandstone (Water-worn pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Asphalt Chunk
Asphalt concrete
man-made composite
Fossiliferous Sedimentary Rock
Sedimentary Rock with Invertebrate Fossil Imprint
fossil
Shale
Laminated Mudstone
sedimentary
Basalt Pebble
Extrusive Igneous Rock (Mafic)
igneous
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Copper Ore Specimen
Cupriferous Rock / Malachite-bearing ore
mineral
Gneiss (with Quartz Vein / Pegmatite Banding)
Metamorphic Gneiss
metamorphic
Sandstone with Quartz Veins
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (Lithic Wacke)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
River Rock
Siliciclastic rock (water-worn pebble)
sedimentary
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Felsic Plutonic Igneous Rock
igneous
Sandstone (Tumbled / Rounded)
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone Concretion
Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)
sedimentary
Landscape Boulder / River Rock
Granitic or Quartzite Rock
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Schist
Mica Schist
metamorphic
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Desert Rose (Gypsum / Barite Rose)
Hydrated Calcium Sulfate (CaSO4·2H2O) / Barium Sulfate (BaSO4)
mineral
Tumbled Agate
Silicon Dioxide (Chalcedony variety), SiO2
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive volcanic rock)
igneous
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Diorite
Diorite
igneous
Shale
Clastic sedimentary rock (primarily clay and silt minerals)
sedimentary
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous silicon dioxide with impurities)
igneous
Leopard jasper (orbicular jasper)
Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions
metamorphic
Granite
Intrusive Igneous Rock
igneous
Pink Granite
Granite (Phaneritic Quartz-Feldspar rock)
igneous
Copper Ore Bearing Rock
Host rock with secondary copper minerals (such as Malachite, Azurite, and Chrysocolla)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous