Granite
Granite (Plutonic Igneous Rock)
igneous
Category
Man Made Rock (Technosol)
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Granite
Granite (Felsic Plutonic Rock)
igneous
Chert
Silicon dioxide (SiO2)
Sedimentary
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Mixed polished gemstone and mineral collection
Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces
gemstone
Brecciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
igneous
Porphyry
Porphyritic Igneous Rock
igneous
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
sedimentary
Chalk
Calcium carbonate (CaCO3)
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Possible basalt or iron-rich slag
Basalt (tentative; identification uncertain from image)
igneous
Quartzite pebble
Quartzite (SiO2)
metamorphic
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Red Sandstone
Quartz Arenite (iron-stained) / SiO2
sedimentary
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Natural Pearl
Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3
mineral
Mica Schist
Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)
metamorphic
Chalk
Carbonate rock (mainly CaCO3)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Fossiliferous Limestone with Crinoid Stem
Sedimentary Rock with Crinoidea Fossil
fossil
Basalt
Basalt (Mafic volcanic rock)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Aura Quartz (Anomalously Coated Quartz)
Silicon Dioxide (SiO2) treated with vaporized metals
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Asphalt Chunk (with aggregate)
Bituminous concrete / Anthropogenic conglomerate
sedimentary (anthropogenic/man-made conglomerate)
Pumice or vesicular volcanic tuff
Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments
igneous
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Quartz Sandstone Pebble
Sandstone (SiO2 dominated)
sedimentary