Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Category
Not A Natural Rock
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Yellow Jasper
Silicon Dioxide (SiO2) with Goethite/Iron inclusions
sedimentary
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Opalite
Synthetic Opalite Glass
mineraloid (man-made)
Granite
Phaneritic Felsic Igneous Rock
igneous
Slate
Slate (foliated metamorphic rock)
metamorphic
Porphyritic Basalt
Porphyritic Basalt (Silicate Rock)
igneous
Aventurine
Aventurine Quartz (SiO2 with inclusions)
metamorphic
Likely tumbled dark volcanic rock
Probably basalt or basaltic andesite; exact identification is uncertain from the image
igneous
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Tumbled basalt (likely)
Basalt; fine-grained mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, often with minor olivine and iron oxides
igneous
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Amethyst in Matrix
Amethyst (Silicon Dioxide), Formula: SiO2
mineral
Herkimer Diamond
Quartz (Silicon Dioxide, SiO2)
mineral
Sandstone
Arenite (compositionally various, primarily SiO2)
sedimentary
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Small tumbled dark stone, possibly basalt or slag
Likely fine-grained basalt; exact identification is uncertain from the photograph
igneous
Greenstone (Celadonite-bearing Volcanic)
Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
metamorphic
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Plutonic Felsic Rock
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Purple Dyed Agate Geode (Banded Chalcedony)
Silicon Dioxide (SiO2) - variety: Agate
mineral
Red Granite
Granite (Felsic intrusive igneous rock)
igneous
Granite Pebble
Granite (Phaneritic intrusive igneous rock)
igneous
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite Pebble
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Green Aventurine and Clear Quartz
Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)
Mineral
Limestone
Sedimentary rock composed mainly of calcite (CaCO3)
sedimentary
Citrine (Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
sedimentary
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Red Sandstone
Arenite (Iron-rich Sandstone)
sedimentary
Raw Diamond (Rough Uncut)
Diamond (C - pure carbon)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Porphyry
Porphyritic Basalt or Andesite
igneous
Jasper (Chert)
Silicon Dioxide (SiO2)
sedimentary