Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Category
Antropogenic (Man Made Material)
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Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Slate
Metamorphic Pelitic Rock
metamorphic
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Diamond
Native Carbon (C)
mineral
Polished amethyst-bearing quartz
Quartz, SiO₂; purple coloration from irradiation and trace iron
mineral
Cobalt Glass Slug (Man-made Glass)
Amorphous Silica with Cobalt Oxide (SiO2 + CoO)
mineraloid
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Antropogenic Glass / Mineraloid
Blue chalcedony cabochon (likely)
Chalcedony, microcrystalline SiO₂; possibly blue agate or common opal, which cannot be distinguished confidently from the image
mineral
Chert (White Chert/Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Flint (gray chert)
Microcrystalline quartz (SiO₂), a variety of chert
sedimentary
Flint (chert)
Microcrystalline quartz (SiO₂), a variety of chert
sedimentary
Coquina
Bioclastic Limestone
sedimentary
Likely flint (chert) fragment
Chert, microcrystalline quartz (SiO₂)
sedimentary
Ruby in Matrix
Corundum (Al2O3)
mineral
Diamond
Carbon (C)
mineral
Sandstone
Arenite
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Clay Brick
Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)
metamorphic (man-made/anthropogenic)
Red agate bead (likely dyed or treated)
Agate, a microcrystalline variety of quartz; SiO₂
gemstone
Red-orange sunstone (likely aventurine feldspar) bead bracelet
Feldspar, commonly oligoclase or labradorite with copper inclusions; composition varies by source
mineral
Slate
Metamorphic Pelitic Rock
metamorphic
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Exposed aggregate concrete (stone-chip surface)
Portland-cement concrete containing natural aggregate; not a natural rock
sedimentary
Engraved purple stone cabochon, possibly amethyst
Unconfirmed; if amethyst, quartz (SiO₂)
gemstone
Blue chalcedony cabochon (probable)
Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂
gemstone
Polished stromatolite (likely fossilized microbial mat)
Fossil stromatolite; chiefly microcrystalline quartz (SiO₂), commonly replacing carbonate
fossil
Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Diamond (as set in a gold ring)
Carbon (C)
mineral
Polished jasper pebble
Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions
mineral
White pebbles (rock material not identifiable from the image)
Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock
sedimentary
Malachite
Malachite, Cu₂CO₃(OH)₂; a banded botryoidal copper carbonate specimen
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Limpets Shell / Fossil Specimen
Patellogastropoda (Class)
fossil
Chert (specifically Tan/Gray Chert)
Microcrystalline quartz (SiO2)
sedimentary
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Asphalt Concrete
Bituminous Concrete / Asphaltic Composite
not a natural rock (man-made composite)
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary