Quartz Pebble
Silicon Dioxide (SiO2)
mineral
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Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Sandstone (Arenite)
sedimentary
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Graphic Granite
Graphic Granite (Pegmatitic Alkaline Granite)
igneous
Pumice
Pumice (Volcanic Glass Foam)
igneous
Granite
Felsic intrusive igneous rock
igneous
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Sandstone
Arenite
sedimentary
Sunstone Quartz / Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Green Sheen Obsidian
Volcanic Glass (SiO2 with microscopic inclusions)
igneous
Granite
Intrusive Igneous Rock
igneous
Basalt
Mafic extrusive igneous rock
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Onyx (Commercial Marble/Travertine)
CaCO3 (Calcite / Banded Limestone)
metamorphic
Quartz Crystal Matrix
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2) with Goethite/Limonite inclusions
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Hag Stone
Perforated sedimentary rock (typically sandstone or limestone)
sedimentary
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Quartzite with Iron Staining
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Plutonic Igneous Rock
igneous
White Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock
igneous
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Granite
Intrusive Igneous Rock (Felsic)
igneous
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
River Pebbles and Cobbles
Polymictic Gravel / Water-worn Lithic Fragments
sedimentary
Agate Pebble
Silicon dioxide (SiO2) - Chalcedony variety
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper and Quartz Breccia
Silica breccia (SiO2)
sedimentary
Limonite
FeO(OH)•nH2O
mineral
Jasper and Quartz Breccia
Silicified Breccia (Quartz / Chalcedony / Hematite)
sedimentary
Limestone with Iron Oxide Staining
Sedimentary Rock (Calcite, CaCO3)
sedimentary
Mammoth or Mastodon Tooth Fossil
Mammuthus / Mammut tooth
fossil