Anthropogenic (Man Made Material Mimicking Sedimentary Rock)

Belemnite Fossil

Belemnitida (rostrum)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (Chocolate or Brown Flint)

Chert (SiO2)

Pearl necklace

Pearl, primarily aragonite (CaCO₃) and conchiolin

Slate

Metamorphic Pelitic Rock

Red jasper pebble

Jasper, an opaque, iron-oxide-colored variety of microcrystalline quartz (SiO₂)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Rounded gray pebble, likely quartzite

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

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

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

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

Sandstone

Arenite (SiO2 based)

Chert

Microcrystalline Quartz (SiO2)

Grey Chalcedony

Silicon Dioxide (SiO2)

Sandstone

Arenite (mostly SiO2)

Ferrochrome Slag

Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Fossilized Burrow

Trace fossil (Ichnogenus)

Red jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored chiefly by iron oxides

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Jasper / Chert (Red)

Cryptocrystalline quartz (SiO2)

Chert

Chert (Microcrystalline Quartz)

Porous limestone (likely fossiliferous or weathered limestone)

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

N/A - Man-made object (Jewelry Chain)

Antiqued or Oxidized Metal Chain (often Steel or Brass)

Sandstone

Clastic Sedimentary Rock

Petrified Wood

Silicified Wood (primarily SiO2)

Fossil Coral

Scleractinia (Stony Coral) fossil

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Polished jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with possible iron-oxide and other mineral inclusions

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Yellow chalcedony (possibly iron-stained agate)

Microcrystalline quartz, SiO₂

Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)

Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Sandstone

Arenite

Sandstone (Pebble)

Sandstone (SiO2 with matrix/cement)

Blue Goldstone

Synthetic Avanturine Glass (or Aventurine Glass)

Carved yellow stone butterfly

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

Tumbled amber-colored chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O