Mineral, Specifically A Rock Fragment

Breccia

Breccia

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Fossilized bivalve shell fragment

Pectinid or related scallop bivalve; shell originally composed mainly of calcite (CaCO₃)

Likely quartz-rich mineral fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Pink Granite

Phaneritic Plutonic Felsic Igneous Rock (Granite)

Larimar (Pectolite)

NaCa2Si3O8(OH)

Sandstone (Quartzite-leaning)

Arenite (primarily SiO2)

Quartz Druzy Geode Fragment

Silicon Dioxide (SiO2)

Amethyst Geode Fragment

Amethyst (Silicon Dioxide, SiO2) with Quartz matrix

Weathered iron-rich rock fragment

Uncertain; possibly limonite/goethite-bearing ironstone or weathered basalt

Milky Quartz

Silicon Dioxide (SiO2)

Weathered granite or granitic gneiss

Granite; primarily quartz, feldspar, and mica (exact identification uncertain from the photo)

Sandstone or Weathered Conglomerate

Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)

Greywacke (likely)

Greywacke (a type of sandstone)

Fossiliferous limestone fragment

Limestone, chiefly calcite (CaCO₃), possibly containing shell or coral fossil material

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Milky quartz

Quartz (SiO₂), likely massive or drusy quartz

Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Fossilized tooth or tooth fragment

Indeterminate vertebrate tooth; likely mammalian, mineralized hydroxyapatite

Sandstone (with Rock Art)

Sandstone (Clastic Sedimentary Rock)

Lichen-covered graywacke or granitic glacial cobble

Indeterminate; likely quartz–feldspar–mica rock, possibly weathered granite or granodiorite

Unidentified small rocks or gravel

Sandstone and Gravel Aggregate

Clastic Sedimentary Rock / Quartzose Sandstone

Granite with Mafic Xenolith

Intrusive Igneous Rock (Felsic to Intermediate)

Dark gray fine-grained rock fragment

Likely basalt (possibly andesite); exact identification is limited by the photograph

Granite

Phaneritic Felsic Intrusive Igneous Rock

Amethyst Lace Agate / Banded Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Fossilized cylindrical shell or bone fragment

Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone

Fossiliferous Concretion

Septarian Concretion containing Brachiopods/Crinoids

Ruby (Pinkish-Red)

Corundum (Al2O3 with Chromium trace)

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Clear quartz crystal fragment

Quartz, silicon dioxide (SiO₂)

Sandstone (with secondary weathering/concretion)

Arenite (composed primarily of Quartz, SiO2)

Weathered feldspathic rock, likely granite or granitic pegmatite

Quartz–feldspar–mica aggregate; exact species indeterminate from the image

Sandstone Concretion

Moqui Marble / Ironstone Concretion (Iron oxide-cemented sandstone)

Pink Granite

Phaneritic Igneous Rock (composed of orthoclase, quartz, and mica)

Conglomerate

Conglomerate (SiO2 matrix with various silicate clasts)

Iron-rich weathered stone, possibly limonite/goethite

Limonite (mixture of hydrated iron oxides), commonly goethite (α-FeO(OH))

Amethyst (Chevron Amethyst)

Amethystine Quartz (SiO2)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Weathered igneous rock fragment, possibly granite or granitic gneiss

Indeterminate; likely quartz–feldspar–mica aggregate (granite), possibly foliated gneiss

Serpentine

Serpentine-group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4)