Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
igneous
Category
Mineral (Man Made Glass)
Browse mineral (man made glass) specimens identified by the Rock Identifier community.
Learn about Mineral (Man Made Glass) in the encyclopedia
View all →
Beaded mineral/crystal jewelry (likely turquoise and coral accents)
Variable; blue beads may be turquoise (CuAl6(PO4)4(OH)8·4H2O), with possible dyed howlite, glass, or composite materials
gemstone
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Pearl (Biogenic Mineraloid)
Calcium carbonate (CaCO3) primarily as Aragonite
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Sea Glass (Teal/Turquoise)
Amorphous Silica (SiO2) with trace metal oxides
Anthropogenic (Man-made material processed by nature)
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert / Green Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert or silicified sedimentary fragment (tentative)
Microcrystalline quartz (SiO₂), possibly silicified limestone or fossil-bearing chert
sedimentary
Banded Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Diamond
Native Carbon (C)
gemstone
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (Cut Gemstone)
Carbon (C)
gemstone
Chert (Flint nodule)
Chert (SiO2)
sedimentary
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Beaded gemstone jewelry, likely carnelian and green aventurine
Carnelian: orange chalcedony (microcrystalline SiO₂); green aventurine: quartz with fuchsite or other inclusions (SiO₂)
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Red Quartzite
Quartzite (SiO2)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Amethyst bead bracelet
Amethyst, purple quartz (SiO₂), with likely dyed or heat-treated agate/carnelian beads
gemstone
Asphalt aggregate (crushed stone in bitumen)
Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Tumbled brown chalcedony (likely jasper or agate)
Microcrystalline quartz, SiO₂; chalcedony with iron-oxide staining
mineral
Diamond
Diamond (pure carbon C)
mineral
Diamond
Carbon (C)
mineral
Pearl
Calcium Carbonate (CaCO3) - Aragonite/Calcite
mineral
Chalk
Micrite (primarily Calcium Carbonate, CaCO3)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Fossilized echinoid (sea urchin), likely a flint/chalk-associated test
Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)
fossil