Plume Agate or Moss Agate
Agate (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Possible basaltic rock or meteorite candidate
Likely vesicular basalt; meteorite identification cannot be confirmed visually
igneous
Quartzite Arrowhead (Archaeological Lithic)
Recrystallized Quartz (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Rutilated Quartz
Quartz (SiO2) with Rutile (TiO2) inclusions
Mineral
Peridotite (with Olivine)
Peridotite (dominantly (Mg, Fe)2SiO4)
igneous
Diamond (or Diamond Simulant)
Carbon (C) if diamond, various if simulant (e.g., Cubic Zirconia ZrO2)
gemstone
Kimberlite
Kimberlite
igneous
Black Kyanite
Aluminum Silicate (Al2SiO5)
mineral
Conglomeratic breccia
Clast-supported polymictic conglomerate/breccia, cemented by silica- or carbonate-rich matrix
sedimentary
Tumbled black-and-white stone, likely dendritic agate or jasper
Cryptocrystalline quartz (SiO₂), possibly chalcedony with manganese-oxide dendrites
mineral
Chert (Chert Nodule)
Silicon Dioxide (SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Queen Conch Shell (Biogenic Calcium Carbonate)
Aliger gigas (synonym Strombus gigas); Composition: Aragonite (CaCO3)
mineral
Sandstone with Lichen and Iron Oxide Staining
Quartz Arenite / Sandstone
sedimentary
Tumbled citrine or iron-stained quartz
Quartz (SiO₂), likely iron-oxide-stained or natural citrine
mineral
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Pink Granite
Phaneritic Plutonic Igneous Rock (high K-feldspar)
igneous
Small tumbled dark stone, possibly basalt or slag
Likely fine-grained basalt; exact identification is uncertain from the photograph
igneous
Coal (Bituminous)
Organic sedimentary rock primarily consisting of carbon (C)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Limestone and Quartz Gravel with Petrified Wood
Sedimentary gravel aggregate and fossilized wood
sedimentary
Basalt with Peridotite Inclusion
Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith
igneous
Iron-stained weathered stone (tentative)
Undetermined; possibly weathered iron-rich basalt or concretion
mineral
Rough Diamond
Diamond (pure Carbon, C)
mineral
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Chert (often called Jasper or Flint in this color variety)
Silicon Dioxide (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Granitic Pegmatite
Granite Pegmatite (coarse-grained intrusive igneous rock)
igneous
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Quartz-bearing iron-stained breccia
Brecciated quartz/quartzite with iron oxides, chiefly SiO₂ with hematite/goethite and possible feldspar or host-rock fragments
mineral
Basalt
Basalt
igneous
Carborundum
Silicon Carbide (SiC)
mineral
Sandstone
Arenite
sedimentary
Coal (Bituminous / Anthracite)
Carbonaceous Sedimentary Rock (C)
sedimentary
Laterite
Laterite (Iron and aluminum-rich residual rock)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (SiO2 with Fe2O3 oxides)
sedimentary
Sandstone or Mudstone
Sedimentary Rock
sedimentary
Sea Glass
Man-made silicate glass
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral