Polished green aventurine
Quartzite dominated by quartz (SiO₂), with green fuchsite mica or chlorite inclusions
mineral
Category
Anthropogenic (Man Made Material)
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Chert (Commonly known as Flint or River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sandstone (lithified arenite/wacke)
Sedimentary Rock
Tumbled blue-gray stone, likely quartzite or fine-grained basalt
Provisional identification: quartzite (mostly quartz, SiO₂) or basalt (plagioclase–pyroxene); image alone cannot distinguish reliably
igneous
Rounded white pebble, likely quartz or feldspar
Most consistent with milky quartz (SiO₂), though altered feldspar or calcite is possible from the image
mineral
Unakitized Granite
Granite / Altered Monzonite with Epidote
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Diamond
Natural Diamond (Carbon, C)
gemstone
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Porphyry (likely Porphyritic Andesite or Basalt)
Porphyritic Igneous Rock
igneous
Diamond
Native Carbon (C)
mineral
Petrified Wood
Silicified wood (primarily Quartz/Chalcedony, SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Diamond
Carbon (C)
mineral
Breciated Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Diamond
C (Native Carbon)
mineral
Petrified Wood
Silicified wood (principally SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, SiO2)
mineral
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Tumbled jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-bearing jasper
mineral
Tumbled black-and-white banded stone, likely onyx or agate
Cryptocrystalline quartz (SiO₂), probably banded chalcedony/onyx
mineral
Graphic Granite (or Pegmatite with Tourmaline/Biotite)
Alkali-feldspar granite pegmatite
igneous
Muscovite Mica
Muscovite, KAl2(AlSi3O10)(OH)2
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Tumbled banded metamorphic stone
Likely banded gneiss or migmatitic gneiss; exact identification requires testing
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Jasper and Quartz Breccia
Silica breccia (SiO2)
sedimentary
Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Sandstone
Clastic sedimentary rock (quartz arenite)
sedimentary
Quartzite with Quartz Veins
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite/Arkosic sandstone)
sedimentary
K2 Stone
Azurite in Granite
igneous
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary