Mineral, Specifically A Rock Fragment

Moldavite

Moldavite (Silica-rich glass, SiO2 + Al2O3)

Banded Agate (specifically Carnelian Agate)

Silicon Dioxide (SiO2)

Turquoise

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Likely dark mineral or rock fragment

Indeterminate from image; possibly a dark silicate mineral such as hornblende, biotite, or basalt

Quartz-veined Granite or Gneiss Pebble

Silicate-rich metamorphic rock fragment

Chert (Jasper-rich)

Silicon Dioxide (SiO2)

Serpentine

(Mg,Fe)3Si2O5(OH)4

Asphalt aggregate

Human-made bituminous asphalt containing crushed silicate rock aggregate

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Rock Fragment with Calcite/Quartz Vein

Polymictic Rock Fragment (SiO2 / CaCO3)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Limestone (specifically fossiliferous/skeletal limestone)

Calcium Carbonate (CaCO3)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Unidentified brown mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar, or weathered limonite

Weathered mineralized rock fragment

Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining

Dyed Agate

Silicon Dioxide (SiO2) with artificial pigment

Likely garnet crystal fragment

Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)

Red Jasper with Quartz

Microcrystalline Quartz (SiO2)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained or included in a mixed rock; exact identification is uncertain from the image

Likely rough granite or granitic rock fragment

Granite (quartz–feldspar–mica assemblage; exact identification is uncertain from the image)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Orange Quartzite / Carnelian Agate

Silicon Dioxide (SiO2)

Weathered granite (likely)

Granite, a quartz–feldspar–mica intrusive igneous rock

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Small pale mineral/rock fragment

Indeterminate; possibly weathered quartz, calcite, or light-colored limestone

Small rounded light-colored mineral pebble

Indeterminate; possibly quartz, feldspar, or calcite

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Weathered Fragment)

Clastic Sedimentary Rock

Jasper (Yellow Jasper)

Silicon Dioxide (SiO2) with iron inclusions

Larimar (Pectolite)

NaCa2Si3O8(OH)

Basalt with Quartz Veins

Mafic Igneous Rock with Quartz (SiO2) intrusions

Greenstone / Epidosite

Metamorphosed Mafic Igneous Rock (Epidote-Chlorite group)

Vesicular Basalt (Scoria)

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Banded Agate (specifically Crazy Lace Agate style)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amethyst Lace Agate / Banded Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Sandstone or possibly a conglomerate

Arenite (if sandstone)

Red Painted Rock

Artificial Coated Lithic Fragment

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)