Antropogenic (Man Made Material)

Carved yellow stone butterfly

Undetermined; possibly carved soapstone (talc-rich rock) or another soft ornamental stone

Chert (flint) fragment

Microcrystalline quartz (SiO₂), commonly called chert or flint

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)

Likely chert (flint)

Microcrystalline quartz (SiO₂), likely chert; exact identification is uncertain from the image alone

Pink Granite

Phaneritic Felsic Igneous Rock (Granite)

Tumbled fossil shark tooth pendant

Likely fossilized shark tooth, possibly Otodus or Carcharhinus; exact species cannot be confirmed from the image

Gemstone ring (stones not reliably identifiable from the image)

Likely faceted yellow stones and clear stones set in a metal band; species and treatments are indeterminate visually

Polished, carved gemstone (possibly dyed agate or glass-like material)

Unconfirmed from the image; no specific mineral can be identified reliably

Rounded gray pebble, likely quartzite

Quartzite (predominantly crystalline quartz, SiO₂); identification is tentative from the image

Weathered concrete or cementitious slab (not natural rock)

Artificial calcium-silicate cement composite; likely Portland cement concrete

Diamond (Cut jewelry specimen)

Diamond (pure Carbon, C)

Diamond

Carbon (C)

Greenstone

Metabasalt / Metavolcanic rock

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Tumbled chalcedony (likely moss or dendritic agate)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Chert (Flint)

Silicon Dioxide (SiO2)

Chert

Chert (SiO2)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Yellow faceted gemstone, likely citrine or yellow sapphire

Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)

Coquina

Biogenic Limestone (mostly Calcium Carbonate, CaCO3)

Tumbled cream-colored pebble

Likely quartz-rich sandstone or limestone; exact identification requires testing

Chert / Flint

Silicon Dioxide (SiO2)

Slate

Metamorphic Pelitic Rock

Slate

Metamorphic Pelitic Rock

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Nephrite Jade

Nephrite

Diamond

Diamond (pure Carbon, C)

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Diamond

Diamond (pure Carbon, C)

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Carved labradorite fish

Labradorite, calcium-rich plagioclase feldspar (approximately (Ca,Na)(Al,Si)₄O₈)

Fossil or modern bivalve shell

Calcium carbonate shell, likely aragonite (CaCO₃); exact species cannot be determined from the image

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Diamond (in Jewelry)

Carbon (C)

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Granodiorite / Granite (Weathered)

Granodiorite

Chert (Honey Chert / Flint)

Silicon Dioxide (SiO2)

Chert

Microcrystalline silica (SiO2)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)