Sedimentary Rock (Possibly Conglomerate Or Breccia With A Quartz Vein)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

Puddingstone

Conglomerate (typically quartz-rich or jasper-rich)

Quartz (Orange/Pink variety)

Silicon Dioxide (SiO2)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Basalt with Quartz/Feldspar Inclusions

Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining

Dark flint or chert fragment

Microcrystalline quartz (SiO₂), likely flint/chert

Small pale rock fragment

Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment

Red Jasper (possibly Agatized Jasper)

Jasper (Silicon Dioxide, SiO2 with Fe2O3 inclusions)

Milky Quartz (Water-worn Pebble)

Silicon Dioxide (SiO2)

Ferruginous Quartz

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

Quartz Druzy / Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Brown Marble

Metamorphic Limestone (CaCO3)

Weathered granite or granitic gneiss

Granite; mainly quartz (SiO₂), feldspar, and mica, possibly with metamorphic foliation

Limestone (Brecciated/Recrystallized)

Calcium Carbonate (CaCO3)

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Quartz (Milky or Citrine-tinted)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Unidentifiable Rock Fragment

Quartz

Silicon Dioxide (SiO2)

Polished rhyolite (likely porphyritic rhyolite)

Rhyolite, composed chiefly of quartz and alkali feldspar with minor plagioclase, biotite, and iron oxides

Banded Jasper (possibly "Picture Jasper")

Jasper (a microcrystalline variety of Quartz / Silicon Dioxide - SiO2)

Quartz

Silicon Dioxide (SiO2)

Bornite (“peacock ore”), likely weathered copper sulfide

Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish

Jasper

Microcrystalline Quartz (SiO2)

Quartz (Milky or Rough Quartz)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Weathered granite or granitic gneiss

Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Mixed collection of Quartz varieties, Chalcedony, and metamorphic pebbles

Mixed gemstones (primarily Silicon Dioxide - SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Polished Stone Pendant (Identity Unclear)

Unknown (Possibly Jasper/Agate/Quartz mixture)

Milky quartz vein fragment

Quartz, silicon dioxide (SiO₂)

Rounded basalt pebble

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with minor olivine or magnetite

Light-colored limestone (probable fossiliferous or micritic limestone)

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz Mineral Specimens

Quartz (Silicon Dioxide, SiO2)