Sedimentary (Artificial)

Tumbled blue stone, likely dyed howlite or magnesite

Howlite (Ca₂B₅SiO₉(OH)₅), possibly magnesite (MgCO₃), artificially blue-dyed

Dyed blue howlite or magnesite tumbled stone

Howlite (Ca₂B₅SiO₉(OH)₅), possibly magnesite (MgCO₃), artificially dyed blue

Tumbled purple stone, possibly lepidolite-bearing rock or dyed quartzite

Uncertain from image; possible quartz (SiO₂) with purple mica, or artificially dyed silicate

Turquoise cabochon

Turquoise; hydrated copper–aluminum phosphate, approximately CuAl6(PO4)4(OH)8·4H2O (composition varies)

Slag (Industrial Byproduct)

Ferrous/Non-ferrous Silicate

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Peacock Ore

Bornite (Cu5FeS4)

Red Tiger's Eye beads

Tiger's Eye (variety of Chalcedony, SiO2)

Yellow chalcedony or citrine-like polished stone

Chalcedony (microcrystalline quartz, SiO₂), possibly dyed or artificially illuminated; exact identification is uncertain from the image

Pearls

Aragonite (calcium carbonate) and Conchiolin

Banded malachite cabochon

Malachite, Cu₂CO₃(OH)₂; the dark bands may be manganese-oxide or other sulfide-rich matrix, and could also indicate a composite or treated specimen

Polished blue stone, likely sodalite or dyed quartz

Possibly sodalite (Na₈Al₆Si₆O₂₄Cl₂) or artificially dyed quartz/chalcedony; image alone is inconclusive

Smoky Quartz

SiO2 (Silicon Dioxide)

Smoky Quartz

Smoky Quartz (SiO2)

Citrine

Quartz (SiO₂)

Smoky Quartz

Quartz (SiO₂)

Blue Lace Agate

Chalcedony (a form of Quartz) - SiO2

Ocean Jasper

Orbicular Jasper (variety of Chalcedony - SiO2)

Pink tumbled stone, likely dyed howlite or magnesite

Most likely magnesite (MgCO₃) or howlite [Ca₂B₅SiO₉(OH)₅], artificially dyed pink; exact identification requires testing.

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Fossil-bearing concretion, possibly containing a fossil shell or other organic inclusion

Calcareous concretion; exact fossil and host-rock composition are not identifiable from the image

Sandstone or Siltstone

Arenite (if sandstone)

Fossiliferous Sedimentary Rock

Sedimentary limestone with invertebrate fossil imprint

Sandstone

Arenite

Shale

Shale (clastic sedimentary rock)

Shale (or Mudstone/Siltstone)

Sedimentary Mudrock (SiO2, Al2O3 base with clay minerals)

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Quartz pebble

Silicon dioxide (SiO2)

Sedimentary Sandstone

Arenite (Sedimentary Rock)

Generic Pebble / Rock Fragment

Lithic fragment / Weathered rock

Sandstone

Clastic Sedimentary Rock

Shale

Argillaceous sedimentary rock

Mudstone

Argillite / Siliciclastic sedimentary rock

Shale

Sedimentary Shale

Shale and Pebble Fragment

Sedimentary Rock (Mudstone/Shale with Silica Pebble)

Shale

Clastic Sedimentary Rock

Brown Sandstone (River Rock)

Arenite

Shale fragment

Shale (clay mineral rich sedimentary rock)

Shale / Mudstone

Sedimentary rock (Claystone / Mudstone / Shale)

Banded Siltstone / Mudstone Pebble

Siltstone / Argillite

Sandstone with Quartz Vein

Quartz-veined Arenite (SiO2 in detrital quartz matrix)

Sandstone Pebble

Arenite (predominantly SiO2)