Man Made Rock (Technosol)

Tumbled Gabbro

Gabbro (Mafic intrusive igneous rock)

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

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)

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)

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

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

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)

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

Diamond

Native Carbon (C)

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Diamond (in a jewelry setting)

Carbon (C)

Dark gneiss or migmatitic amphibolite

Band ed gneiss; composition likely quartz–feldspar–biotite/amphibole, possibly migmatite

Diabase (Dolerite)

Diabase or Dolerite

Blue Sea Glass

Amorphous Silica (Anthropogenic glass)

Carved red jasper bead (likely ceramic imitation)

Jasper, microcrystalline quartz (SiO₂); exact material uncertain from the image

Chert (Quartz Variety)

Chert (Silicon Dioxide, SiO2)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)