Antropogenic (Man Made)

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)

Muscovite Schist

KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix

Serpentinite

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

Limestone (Micrite/Chalky variety)

Calcium Carbonate (CaCO3)

Serpentine (likely antigorite-rich serpentinite)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with dark magnetite/chromite or pyroxene inclusions

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

Quartz (likely) or a Quartzite Pebble

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

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)

Unidentified dark reddish-brown rock or mineral specimen

Indeterminate from the blurred image; possibly iron-stained quartz, jasper, or a metallic sulfide-bearing rock

Likely tumbled dark volcanic rock

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

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Limestone (River Pebble)

Calcite (Calcium Carbonate) - CaCO3

Granite

Granite

Pink Granite (Fragment)

Pink Granite (dominated by Potassium Feldspar: KAlSi3O8)

Milky Quartz

Silicon dioxide (SiO2)

Specular Hematite (Iron Ore)

Iron(III) oxide (Fe2O3)

Granite

Granite (Felsic Plutonic Rock)

Limestone

Calcium Carbonate (CaCO3)

Flint

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

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Granite

Phaneritic Felsic Igneous Rock

Sandstone (likely Fossiliferous)

Arenite / Sedimentum arenaceum

Chert (Fossiliferous)

Silicon dioxide (SiO2)

Basalt

Fine-grained mafic volcanic rock, chiefly plagioclase feldspar, pyroxene, and commonly olivine

Granite

Intrusive Phaneritic Felsic Igneous Rock

Basalt

Basalt

Sandstone (Ferruginous)

Arenite (Fe2O3 rich)