Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Category
Tektite (Natural Glass)
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Ferruginous Quartz (Red Quartz)
Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Granite
Coarse-grained felsic intrusive igneous rock; primarily quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
Tumbled Mixed Gemstones (Quartz and Rutile)
Silicon Dioxide (SiO2) with various inclusions
mineral
Granite
Intrusive Igneous Rock
igneous
Dream Amethyst (Chevron Amethyst)
Silicon Dioxide with inclusions (SiO2)
mineral
Heat-Treated Citrine (Amethyst-based)
Quartz (Silicon Dioxide) - SiO2
mineral
Red Sandstone
Sandstone (lithic arenite / ferruginous sandstone)
sedimentary
Sandstone
Sandstone (principally SiO2)
sedimentary
Included quartz (likely iron-oxide-bearing quartz)
Quartz, silicon dioxide (SiO₂), with limonite/goethite inclusions
mineral
Clear quartz sphere
Quartz (silicon dioxide, SiO₂)
mineral
Granite
Phaneritic plutonic felsic igneous rock
igneous
Rounded gray-brown river cobble
Indeterminate lithology; possibly weathered quartzite, chert, or fine-grained sandstone
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Possible weathered quartz-rich rock or iron-stained mineral fragment
Indeterminate; possibly quartz (SiO₂) with iron-oxide inclusions
mineral
Yellow Jasper
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
mineral
Brown Jasper / River Pebble
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartzite
Quartzite (Metamorphosed Quartz Sandstone)
metamorphic
Quartzite pebble
Quartzite (SiO2)
metamorphic
Red Jasper (Tumbled)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Red Jasper (Siltstone variant)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Red Jasper (specifically Brecciated Jasper)
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary
Yellow Jasper
Chalcedony/Quartz (SiO2)
sedimentary
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Flint or chert
Microcrystalline quartz (SiO₂), commonly with chalcedony
sedimentary
Quartzite Pebble
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Grey Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Granite
Granite (phaneritic intrusive felsic igneous rock)
igneous
Orbicular jasper (orbicular chert), likely ocean jasper
Silicified microcrystalline quartz (chalcedony), SiO₂, with iron-oxide and/or clay-rich orbicules
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Polished ocean jasper (orbicular jasper)
Microcrystalline quartz (SiO₂) with chalcedony, iron oxides, and assorted silicate inclusions
mineral
Green Onyx (Agate)
Silicon Dioxide (SiO2)
sedimentary
Yellow Aventurine
Quartzite with Muscovite/Sericite inclusions (SiO2)
metamorphic
Quartz Pebble (Yellow Quartz / Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Amorphous volcanic glass)
Igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-rich pegmatitic rock (likely quartz–feldspar–mica specimen)
Granitic pegmatite; mainly quartz (SiO₂), feldspar, and dark mica/amphibole
igneous
Light-colored quartz-rich stone, possibly milky quartz
Quartz (SiO₂), provisional identification
mineral