Synthetic (Man Made Material Mimicking Natural Stone)

Green Druzy Quartz (Prasiolite)

Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)

Tree Agate (or Moss Agate)

Dendritic Agate (Silicon Dioxide - SiO2)

Rhodonite beads (possibly dyed or treated, or lower quality Rhodonite)

Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone Clast

Arenite (primarily SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Quartzite

Quartzite (SiO2)

White Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide cement)

Basalt

Basalt (Aphanitic Mafic Volcanic Rock)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Jasper (Red/Yellow)

Silicon Dioxide (SiO2) with impurities

Chert / Flint Nodule

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Quartzite (Milky Quartz Cobble)

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Chert / Flint (with quartz or calcite inclusion)

Silicon dioxide (SiO2)

Orange Quartzite (River Pebble)

Quartzite (SiO2 with iron oxide impurities)

Petrified Wood

Silicified Wood (SiO2)

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

Ironstone Concretion / Limonite Node

Ferruginous Sedimentary Rock (composed primarily of Limonite FeO(OH)·nH2O and Goethite)

Fossiliferous Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Sandstone

Arenite (primarily composed of SiO2)

Petrified Wood

Silicified Wood (SiO2)

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Petrified Wood

Silicified Wood (SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Siltstone/Sandstone (possibly Wonderstone or Picture Sandstone)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide inclusions)

Diamond

Diamond (Carbon, C)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Red Sandstone

Arenite (ferruginous sandstone)

Pyrite

Iron Disulfide (FeS2)

Mica Schist

Mica Schist (Complex Silicate Rock)

Quartzite

Quartzite (primarily SiO2)

Grooved Maun Ball (Maul/Hammerstone-like Concretion)

Calcareous/Ferruginous Concretion in Sandstone Matrix

Basalt (Water-worn pebble)

Mafic Igneous Rock (primarily Plagioclase feldspar and Pyroxene)

Chert (Flint)

Silicon Dioxide (SiO2)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Rhodonite

Rhodonite (MnSiO3)