Man Made Object (Metalwork)

Slate

Slate (Metamorphic silicate rock)

Exposed aggregate concrete (stone-chip surface)

Portland-cement concrete containing natural aggregate; not a natural rock

Mixed polished gemstone and mineral collection

Primarily quartz varieties (SiO₂), plus probable aventurine, rose quartz, amethyst, agate, jasper, serpentine, feldspar, and possibly dyed or man-made glass pieces

Granite (weathered pebble)

Granite (plutonic igneous rock)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Chert (Flint)

Silicon Dioxide (SiO2)

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Diamond

Diamond (pure Carbon, C)

Polished black stone, likely hematite or black jasper

Hematite (Fe₂O₃) or opaque chalcedony/jasper (SiO₂); image-only identification is uncertain

Faceted transparent gemstone pendant

Uncertain from image; likely faceted quartz (SiO₂), cubic zirconia (ZrO₂), or glass imitation

Engineered Quartz (Quartzite look-alike)

Silicon Dioxide (SiO2) composite

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Lava Rock (Dyed)

Basalt / Volcanic scoria

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Diabase (Dolerite)

Diabase / Dolerite

Turquoise

Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Coquina

Biogenic Limestone (Coquina)

Vesicular Basalt (or Scoria)

Vesicular Basalt

Chert (White Chert/Flint)

Microcrystalline Quartz (SiO2)

Peanut Wood (Fossilized Wood in Radiolarite)

Petrified Wood (Silicified)

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Gypsum (Satin Spar / Alabaster variety)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Chert (Flint / Quartz Nodule)

Microcrystalline Quartz (SiO2)

Flint

SiO2 (Cryptocrystalline Quartz)

Chert (variations include Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Granite

Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)

Belemnoit (Fossil)

Belemnoidea (Order), Rostrum / Guard

Siltstone Pebble

Siltstone (composed of microscopic quartz and clay minerals)

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

Land Snail Shell

Gastropoda (Calcium Carbonate, CaCO3)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Lapis Lazuli

Lapis Lazuli (a rock type, not a single mineral, composed primarily of lazurite, calcite, and pyrite)

Polished stone sphere, possibly agate or jasper

Likely microcrystalline quartz (SiO₂); exact variety cannot be confirmed from the image

Tumbled chert or jasper pebble

Microcrystalline quartz (SiO₂), likely chert/jasper

Polished greenstone/serpentine pebble (probable)

Serpentinite, dominated by serpentine-group minerals (lizardite/chrysotile); possible accessory olivine or chlorite

Diamond

Carbon (C)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Granodiorite

Intrusive Igneous Rock

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite