Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Category
Not A Rock (Synthetic Material)
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Sandstone
Sedimentary Clastic Rock
sedimentary
Rough amethyst-bearing quartz specimens
Quartz, SiO₂; purple coloration from trace iron and irradiation
mineral
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Quartz with Mica Schist
Quartz-Mica Schist / Pegmatitic Quartz
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (SiO2 based)
sedimentary
Sandstone (Lithic Arenite)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 based sedimentary rock)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone Pebble
Sandstone (primarily Quartz, SiO2)
sedimentary
Sandstone
Arenite (with iron oxide cement)
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Corundum
Corundum (Al2O3)
Mineral
Sandstone
Arenite
sedimentary
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Conglomerate
Conglomerate (Sedimentary Clastic Rock)
sedimentary
Sandstone
Clastic sedimentary rock
sedimentary
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Serpentinite (or Green Quartz Pebble)
Mg3Si2O5(OH)4 (Serpentine group) / SiO2 (Quartz mix)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Quartz vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Lithic Matrix
metamorphic
Fossil bivalve shell
Likely an extinct or modern-like ribbed cockle/scallop; exact genus requires locality and diagnostic hinge features
fossil
Basalt
Basalt (Mafic volcanic rock)
igneous
Granite
Felsic intrusive igneous rock
igneous
Schist
Mica Schist
metamorphic
Greenstone / altered basalt fragment
Likely chlorite–epidote–actinolite altered basalt; exact identification requires testing
igneous
Sandstone
Arenite (typically SiO2 based)
sedimentary
Sandstone (with potential Concretion or Fossil fragment)
Arenite (primarily SiO2)
sedimentary
Azurite-Malachite (often a mixed specimen)
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2(CO3)(OH)2. The specimen appears to be a natural mixture or intergrowth of these two minerals.
Mineral
Pink Granite / Gneiss Pebble
Quartz-Feldspar Granitic Rock
igneous
Sandstone (likely Arkosic or Ferruginous)
Arenite (SiO2 with iron oxides or feldspar)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Asphalt (Road Aggregate)
Asphalt concrete / Bituminous mixture
anthropogenic sedimentary (technolith)
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Sandstone
Arenite (primarily SiO2)
sedimentary
Coarse-grained Granite or Gneiss
Granitic intrusive rock
igneous