Polished quartz-rich feldspar rock, possibly orbicular granite
Granite or granitic pegmatite; chiefly quartz (SiO₂), feldspar, and dark biotite/amphibole
igneous
Category
Man Made Silicate (Anthropogenic Glass)
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Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert or silicified sedimentary fragment (tentative)
Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert
sedimentary
Sandstone
Arenite
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Arenite (variable SiO2 composition)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Rounded quartz pebble
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled brown mineral pebble, possibly jasper or weathered quartzite
Indeterminate from the blurred image; likely microcrystalline quartz (SiO₂) if jasper, or quartzite dominated by quartz
mineral
Tumbled brown chalcedony or agate
Microcrystalline quartz (SiO₂), likely chalcedony; possibly iron-stained jasper or agate
gemstone
Faceted gemstone in a jewelry setting
Indeterminate from image; likely quartz, cubic zirconia, or another transparent faceted stone
gemstone
Blue faceted gemstone ring, likely synthetic sapphire or blue topaz
Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)
gemstone
Blue Quartz
Silicon Dioxide (SiO2) with fibrous inclusions (such as tourmaline, magnesio-riebbeckite, or crocidolite)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Agate (Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Likely flint (dark chert)
Microcrystalline quartz (SiO₂), commonly called chert or flint
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely chalcedony or chert with limonite/goethite staining
mineral
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Green Slag Glass
Cullet (Amorphous Silicon Dioxide with impurities)
Man-made rock-like material
Quartzite
Metamorphic Quartz Arenite
metamorphic
Unidentified gray-brown stone
Likely fine-grained quartz–feldspar rock; exact identification is not possible from this close, blurred image
mineral
Quartzite (River Pebble)
Quartzite (Mainly SiO2)
metamorphic
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Sandstone (Ferruginous)
Arenite (Fe2O3 rich)
sedimentary
Sandstone
Arenite
sedimentary
Faceted transparent gemstone pendant
Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation
gemstone
Tumbled chalcedony or quartz pebble
Microcrystalline quartz, SiO₂ (likely chalcedony); exact identification is uncertain from the image
mineral
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper / Chert (Red)
Cryptocrystalline quartz (SiO2)
Sedimentary / Mineral
Tumbled obsidian
Volcanic glass; chiefly SiO₂, noncrystalline
igneous