Organic Gem Material (Botanical)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartzite Pebble

Recrystallized Silicon Dioxide (SiO2)

Red Sandstone

Arenite (high iron oxide content)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Sandstone

Arenite (primarily SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide with impurities), SiO2

Sandstone (with potentially high Feldspar/Arkose content)

Clastic sedimentary rock (SiO2 dominated)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Basalt

Basalt (composition of plagioclase feldspar and pyroxene)

Red Sandstone

Arenite (primarily SiO2 with hematite/iron oxide coating)

Sandstone (specifically Red Sandstone)

Arenite (primarily Quartz, SiO2)

Sandstone

Arenite (SiO2 based)

Basalt

Basalt

Serpentinite

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

Scoria (Basaltic Lava Rock)

Vesicular Basalt

Unakite

Unakitized granodiorite / Quartz-Epidote-Feldspar rock

Sandstone

Clastic sedimentary rock (primarily SiO2)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (typically Hematitic Quartz Arenite or Arkose)

Granite

Phaneritic Felsic Igneous Rock (composed of SiO2, KAlSi3O8, NaAlSi3O8)

Mica Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone with Liesegang Rings

Arenite with Iron Oxide Liesegang Banding

Sandstone (Ferruginous)

Arenite (Fe-rich SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Coquina

Biogenic Limestone (Calcite, CaCO3)

Quartzite Pebble

Metamorphosed Sandstone (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Milky Quartz (among River Rock)

Quartz (Silicon Dioxide, SiO2)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

Biggs Jasper

Cryptocrystalline Quartz (Silicon Dioxide) - SiO2

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (with Iron concretions/staining)

Arenite (composed primarily of Quartz and Feldspar with Iron Oxide cement)

Granite

Granite (Mainly Quartz SiO2, Feldspar KAlSi3O8, and Mica KAl2(AlSi3O10)(OH)2)

Asphalt Chunk (with aggregate)

Bituminous concrete / Anthropogenic conglomerate

Biotite (Black Mica)

Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)

Conglomerate

Conglomerate (Clastic sedimentary rock)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Riverstone Quartzite

Quartzite (primarily SiO2)

Quartzite (Gold/Tan River Cobble)

Quartzite (composed primarily of crystalline SiO2)