Synthetic Polymer (Polylactic Acid)

Fossiliferous Limestone

Limestone with fossil inclusions (CaCO3)

Limestone

Calcium carbonate (CaCO3)

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Red Quartzite River Stone

Metamorphic Rock (composed mainly of Quartz, SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

White Quartz Pebble

Silicon Dioxide (SiO2)

Unakite (Epidotized Granite)

Epidotized Granite

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

White Marble

Recrystallized Calcite (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Black Mountain Stone (Seiryu Stone)

Limestone with Calcite veins (CaCO3)

Quartzite Pebble

Quartzite (SiO2)

Quartzite Pebble

Quartzite (primarily Silicon Dioxide, SiO2)

Unakite

Unakite (Altered Granite consisting of Orthoclase KAlSi3O8, Epidote Ca2(Al,Fe)3(SiO4)3(OH), and Quartz SiO2)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Pink Calcite (Mangano Calcite)

Calcium Carbonate (CaCO3)

Onyx Marble (Banded Calcite)

Calcite (Calcium Carbonate, CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Yellow Quartzite (River Pebble)

Quartzite (mainly SiO2)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Quartzite River Stone

Quartzite (primarily SiO2)

Coquina

Bioclastic Limestone (composed primarily of Calcium Carbonate / CaCO3)

Fossiliferous Limestone (with Crinoids)

CaCO3 (Calcium Carbonate)

Quartzite River Rock (with Limonite staining)

Quartzite (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Basalt (River Stone)

Basalt

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartzite (Pink/Red variety)

Quartzite (SiO2 with iron oxide impurities)

Yellow Quartzite (Tumbled)

Quartzite (SiO2)

Granite

Phaneritic Intrusive Igneous Rock (primarily Quartz, Feldspar, and Mica)

Limestone (specifically Tufa or Travertine)

Calcium Carbonate (CaCO3)

Quartzite

Quartzite (SiO2)

Granite Cobble

Plutonic Igneous Rock (Granitic)

Quartzite

Quartzite (SiO2)

Calcite Geode

Calcium Carbonate (CaCO3)

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Fluorite

Calcium Fluoride (CaF2)