Man Made Object (Metal Alloy)

River Stone (Limestone)

Sedimentary Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (Phaneritic igneous rock)

Granite

Granite (Felsic Plutonic Rock)

Limestone

Calcium Carbonate (CaCO3)

Granite

Granite (Felsic Plutonic Rock)

Granite

Granite (Felsic Plutonic Rock)

Blue Chalcedony and Picture Jasper Beads

Blue Chalcedony (SiO2), Picture Jasper (SiO2)

Likely citrine pendant

Quartz, silicon dioxide (SiO₂), probably heat-treated amethyst or smoky quartz

Goethite

Goethite (α-FeO(OH))

Fluorite

Fluorite (Calcium Fluoride - CaF2)

Flint

Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)

Lapis Lazuli

Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Granite

Granite (dominated by Quartz, Alkali Feldspar, and Plagioclase)

Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Arkosic)

Clastic Sedimentary Rock

Sandstone (Ferruginous)

Arenite (Fe2O3 stained)

Pink Granite

Granite (Phaneritic Igneous Rock)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Limestone

CaCO3 (Mainly Calcite or Aragonite)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Limestone (Micrite/Chalky variety)

Calcium Carbonate (CaCO3)

Red Coral

Corallium rubrum (for precious red coral), although other species like Corallium japonicum and Paracorallium are also used.

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 based with various mineral cements)

Chert (Chalk-associated Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Granite

Felsic Intrusive Igneous Rock

Granite

Phaneritic plutonic felsic rock

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Amber

Fossilized Tree Resin (Amorphous Hydrocarbon)

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Tumbled amethyst with possible lepidolite/colored quartz companion

Amethyst, purple quartz (SiO₂), likely with iron-related color centers

Likely basalt (possibly scoriaceous basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine, with minor iron–titanium oxides

Wishing Stone (Basalt or Chert with Quartz Veins)

Basalt or microcrystalline Quartz (Chert) with localized hydrothermal Quartz (SiO2) veining

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

Wishing Stone (Gneiss or Basalt with Quartz Vein)

Gneiss or Metabasalt (with a Quartz or Calcite intrusion)

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Limestone (specifically Dolomitic/Crystalline Limestone)

Sedimentary Carbonate Rock (CaCO3 / CaMg(CO3)2)

Likely tumbled dark volcanic rock

Probably basalt or basaltic andesite; exact identification is uncertain from the image

Limestone

Calcium Carbonate (CaCO3)