Sedimentary Or Igneous (Secondary Formation)

Sapphire (Corundum)

Corundum (Al2O3)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Tumbled Obsidian

Volcanic Glass (Silicon Dioxide)

Granodiorite

Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)

Pink Stained Rock (Likely Quartzite or Sandstone with Iron Oxide Staining)

Quartzite (metamorphic) or Sandstone (sedimentary); coloration likely due to hematite or other iron oxides.

River Quartz Pitting/Cobble

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium)

Amygdaloidal Basalt

Amygdaloidal Basalt (Ca-rich Plagioclase, Pyroxene, and Olivine)

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Diorite (with Iron Staining)

Phaneritic Intermediate Igneous Rock

Jasper

Silicon dioxide (SiO2)

Stromatolite (Jasper-replaced)

Fossilized Stromatolite (Cyanobacteria / Cryptozon / Silica SiO2)

Chert (Iron-stained)

Chert (Cryptocrystalline Quartz, SiO2)

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Pebble)

Quartz (SiO₂)

Sandstone

Arenite (SiO2 based)

Basalt

Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8

Knightia Fossil in Limestone

Knightia eocaena in micritic limestone

Basalt

Basalt (Mafic volcanic rock)

Granite (specifically Rapakivi Granite)

Phaneritic Felsic Igneous Rock (Granite)

Travertine

Calcareous Tufa / Travertine (CaCO3)

Kambaba Jasper (Crocodile Jasper)

Stromatolite (Fossilized Algae within Microcrystalline Quartz), SiO2

Chert (specifically Flint or Jasper variant)

Microcrystalline Quartz (SiO2)

Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone

Arenite (SiO2 predominantly)

Red Siltstone

Siltstone (primarily quartz and feldspar sized 0.0039 to 0.0625 mm)

Petrified Dinosaur Bone (Gembone)

Agatized Dinosaur Bone

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)

Conglomerate (Red Sandstone variety)

Clastic Sedimentary Rock (Conglomeratic Sandstone)

Limonite (often after Hematite or Goethite)

Limonite (FeO(OH)·nH2O)

Milky Quartz

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Red Jasper with Quartz veins

Jasper (Silicon Dioxide, SiO2) with macrocrystalline Quartz veins

Dendritic Agate

Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides

Blue Topaz

Al2SiO4(F,OH)2 (Fluorine-bearing aluminum silicate)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Veined Quartz

SiO2 (Silicon Dioxide)

Banded Iron Formation (BIF)

Banded Iron Formation (Fe2O3 + SiO2)

Banded Iron Formation (Jaspillite)

Banded Iron Formation (BIF) / Jaspillite

Sodalite (blue beads) and Clear Quartz (clear beads)

Sodalite: Na4Al3Si3O12Cl; Quartz: SiO2

Milky Quartz

Quartz (Silicon Dioxide, SiO2)