Polished amethyst-bearing quartz
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Category
Antropogenic (Man Made Glass Byproduct)
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Snowflake Obsidian
Volcanic glass with Cristobalite inclusions (70–75% SiO2)
igneous
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Obsidian
Volcanic glass (SiO2 - Silicon Dioxide)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite
metamorphic
Gold ring with a clear faceted gemstone
Likely diamond (carbon, C); the photograph is insufficient to confirm the stone or metal
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Green Quartzite
Metamorphic Quartz Sandstone (SiO2)
metamorphic
Dark quartz point (possibly smoky quartz)
Quartz, SiO₂; the dark color may indicate smoky quartz, but the image is insufficient to confirm
mineral
Chert Arrowhead
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Cardstock (Paper)
Cellulose (C6H10O5)n
sedimentary (man-made)
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Red cabochon gemstone ring (likely ruby or red spinel; identity unconfirmed)
Possibly corundum (ruby, Al₂O₃) or spinel (MgAl₂O₄); visual identification alone cannot distinguish these from glass or synthetic stones.
gemstone
Quartz Pebble (Beach Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert
Chert (SiO2)
sedimentary
Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Pale green aventurine (likely quartz) sphere
Quartz, SiO₂; possibly pale green aventurine, with color from inclusions or treatment
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Clear crystal-bead bracelet, possibly quartz
Unidentified transparent mineral beads; quartz (SiO₂) is one possibility
mineral
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Faceted glass-like gemstone object
Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image
gemstone
Chert or silicified sedimentary fragment (tentative)
Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Chert
Microcrystalline quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Chert (varietal Chalcedony or Flint)
Silicon dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic