Tumbled green glassy mineral, possibly aventurine or fluorite
Uncertain; likely quartz variety (aventurine quartz, SiO₂) or green fluorite (CaF₂)
mineral
Category
Anthropogenic Specimen (Man Made Material)
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Black-and-white agate geode pendant
Agate (microcrystalline quartz, SiO₂), likely a hollow geode slice with chalcedony and drusy quartz
mineral
Swirled Agate Bead
Silicon Dioxide (SiO2)
mineral
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Amethyst gemstone ring
Quartz, purple variety — SiO₂
gemstone
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint)
Chert (SiO2)
sedimentary
Goldstone (likely blue-free synthetic goldstone pendant)
Synthetic aventurine glass; silica glass with dispersed metallic copper crystals
mineral
Polished yellow calcite
Calcite (calcium carbonate, CaCO₃)
mineral
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
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Chert (with nodule)
Microcrystalline Quartz (SiO2)
sedimentary
River Pebbles (Chert and Quartzite)
Sedimentary Clastic Rock (Silica-rich)
sedimentary
Tektite
Natural impact glass
meteorite
Raw Diamond
Carbon (C)
gemstone
Diamond (in jewelry setting)
Carbon (C)
mineral
Flint / Chert
Microcrystalline Quartz (SiO2)
sedimentary
Polished brecciated jasper pendant
Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation
mineral
Blue gemstone cross pendant
Likely faceted blue topaz (Al₂SiO₄(F,OH)₂); identification is uncertain from the image
gemstone
Tumbled quartz-rich pebble
Microcrystalline quartz (SiO₂), possibly milky quartz or quartzite
mineral
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Decorative gemstone-chip jewelry (likely turquoise, coral, and assorted beads)
Predominantly turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; other pieces appear to be dyed coral or red stone, and possibly shell/metal components
gemstone
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Flint (or Chert with cortex)
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Native Silver
Silver (elemental Ag)
mineral
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Flint
Silicon dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Silica (SiO2)
sedimentary
Moonstone (specifically Rainbow Moonstone / White Labradorite)
White Labradorite (Feldspar Group: (Na,Ca)(Al,Si)4O8)
mineral
Diamond (faceted)
Diamond (Pure Carbon, C)
mineral
Beaded blue-and-green gemstone jewelry
Likely dyed or treated chalcedony/agate and green aventurine or glass-like stone; exact identification requires testing
gemstone
Sunstone (Aventurine Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3
mineral
Banded agate cabochon
Microcrystalline quartz (chalcedony), SiO₂
gemstone