Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral (man-enhanced)
Category
Man Made Material, Not A Natural Rock Or Mineral Specimen
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Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Nephrite Jade
Nephrite
Mineral/Rock
Tumbled basalt (likely)
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, often with minor olivine and iron oxides
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite, possibly granodiorite
Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende
igneous
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Sandstone (Ferruginous / River-worn Cobble)
Sandstone (SiO2 with iron oxide impurities)
sedimentary
Sandstone
Arenite
sedimentary
Sandstone (Pebble)
Arenite
sedimentary
Yellow Chert (Yellow Jasper)
Silicon dioxide (SiO2)
sedimentary
Diamond
C (Native Carbon)
mineral
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Porphyritic Andesite
Andesite (Porphyritic texture)
igneous
Sandstone
Arenite
sedimentary
Sodalite beads
Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor lazurite/pyrite or calcite inclusions
mineral
Greenstone
Metabasalt / Metavolcanic rock
metamorphic
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Likely foliated metamorphic rock, possibly schist
Mica schist or micaceous quartzite; exact identification is uncertain from the photograph
metamorphic
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Rounded granite cobble
Granite; chiefly quartz, feldspar, and mica/amphibole
igneous
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Granite pebble
Granite, chiefly quartz, feldspar, and mica
igneous
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Sandstone (with iron staining)
Quartz Arenite / Ferruginous Sandstone
sedimentary
Diamond
Carbon (C)
gemstone
Sandstone (likely Quartzose)
Arenite (primarily SiO2)
sedimentary
Tumbled green jasper (probable serpentine-rich stone)
Jasper, microcrystalline quartz (SiO₂), possibly mixed with serpentine or chlorite
mineral
Smoky Quartz (Faceted)
Silicon Dioxide (SiO2)
gemstone
Red Sandstone
Arenite (predominantly Quartz with Hematite cementation)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Yellow Quartz (Citrine-colored Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2-rich metamorphic rock)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Sea Glass
Amorphous silicon dioxide (Man-made glass weathered by nature)
mineral