Not A Rock (Man Made Polymer)

Tumbled Gabbro

Gabbro (Mafic intrusive igneous rock)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Note: Item is not a geological specimen

n/a

Porous limestone (likely fossiliferous or weathered limestone)

Calcite-rich limestone; chiefly calcium carbonate (CaCO₃)

Chert Pebble

Chert (Microcrystalline Quartz, SiO2)

Granite

Phaneritic Igneous Rock (composed mostly of Quartz, Feldspar, and Mica)

Lapis Lazuli

Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)

Green glassy mineral specimen, likely rough emerald or green fluorite

Tentatively beryl (Be₃Al₂Si₆O₁₈), emerald variety; synthetic/man-made glass cannot be excluded from the photograph

Anthracite Coal

Anthracite (a variety of coal, predominantly carbon)

Amber

Succinates (C10H16O)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Coal (Anthracite / Bituminous)

Organic Sedimentary Rock (Carbon-based)

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Polished orbicular jasper

Jasper, microcrystalline quartz (SiO₂), with iron oxides and other inclusions

Chert (Flint)

Silicon dioxide (SiO2)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Titanium Aura Quartz (Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2)

Quartzite

Quartzite (SiO2)

Larimar

Pectolite

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Diorite

Diorite (Intermediate intrusive igneous rock)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Unknown dark mineral/rock fragment

Indeterminate; possibly a dark sulfide mineral or slag-like geological fragment

Polished brecciated jasper pendant

Jasper, an opaque microcrystalline variety of chalcedony (mostly SiO₂), with iron-oxide staining and likely brecciation

Granite, possibly granodiorite

Coarse-grained felsic plutonic rock; chiefly quartz (SiO₂), potassium feldspar and plagioclase feldspar, with biotite and/or hornblende

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Coquina

Coquina (Bioclastic Limestone)

White-and-dark marble or agate-style gemstone bead bracelet

Likely calcite-rich marble (CaCO₃) mixed with dark gray stone beads; exact material is uncertain from the photo

Faceted glass-like gemstone object

Likely synthetic glass or cubic zirconia; exact material cannot be confirmed from the image

Sandstone (likely Fossilized Wood or Concrete Simulacrum)

Arenite / Silicified Wood / Anthropogenic Concrete

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Diamond

Carbon (C)

Carnelian cabochon pendant

Carnelian, orange-red chalcedony (microcrystalline quartz, SiO₂)

Hoodoo (Limestone / Siltstone Formation)

Claron Formation (Sedimentary Rock - Limestone, Mudstone, Dolomite)

Fossilized Coral (Petoskey Stone / Hexagonaria)

Hexagonaria percarinata / Rugosa coral (CaCO3)

Tumbled amber-colored chalcedony or jasper

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

Chert

Microcrystalline Quartz (SiO2)

Amber (Copal)

Organic gemstone, fossilized tree resin (often immature amber or copal)

Amber (Copal)

Fossilized Tree Resin

Amber

Succinite (fossilized tree resin)

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Diamond

Native Carbon (C)