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

Clear Quartz Cluster

Quartz (Silicon Dioxide - SiO2)

Gold-bearing Quartz / Auriferous River Rock

Lode Gold in Quartz Matrix (SiO2 + Au)

Granite Pebble with Quartz/Feldspar Vein

Intrusive Felsic Igneous Rock (Granite)

Mixed mineral and rock collection

Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones

Clear Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Moss-covered Limestone with Quartz/Calcite Pocket

Calcium Carbonate (CaCO3) rock with biological moss coating

Jasper

Microcrystalline Quartz (SiO2)

Green Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Iron-stained limestone or coral fragment

Calcite-rich carbonate rock; chiefly CaCO₃ (exact identification is uncertain from the image)

Tumbled pale green mineral specimen, likely calcite

Calcite (CaCO₃), tentative identification

Quartz (Raw Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon dioxide (SiO2)

Wishing Stone (Basalt or Mudstone with Quartz/Calcite Veins)

Hydrothermally veined Basalt (SiO2/CaCO3 intrusions)

Gneiss with Quartz/Feldspar Vein

Felsic to intermediate gneiss

Red Jasper (Brecciated Jasper)

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper

Microcrystalline Quartz (SiO2)

Dark gray slate (possibly argillite or shale)

Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals

Quartz

Silicon Dioxide (SiO2)

Honey-colored chalcedony (possibly yellow/orange agate or carnelian)

Chalcedony, a microcrystalline variety of quartz; SiO₂. The color may result from iron-oxide inclusions. Exact identification is uncertain from a photograph alone.

Barite

Barium sulfate (BaSO4)

Faceted Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Chert or flint fragment

Microcrystalline quartz (SiO₂), likely iron-stained chert

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite (Fe2O3·nH2O) inclusions

Sandstone

Arenite

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Quartz Druze (Crystalline Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Banded Calcite (often commercially sold as 'Mexican Onyx' or 'Honey Onyx')

Calcite (Calcium Carbonate, CaCO3)

Granite

Phaneritic Felsic Igneous Rock (primarily SiO2, Al2O3, K2O, Na2O)

Likely smoky quartz-bearing rock or quartz crystal

Quartz, silicon dioxide (SiO₂), possibly smoky quartz with iron- or irradiation-related coloration

Clear Quartz

Silicon Dioxide (SiO2)

Red Jasper with Quartz Vein

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

Ferruginous Quartz on Ironstone

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Jasper

Microcrystalline Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite in Host Rock

Iron Disulfide (FeS2)

Quartz Pebble (Chalcedony/Chert)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Weathered dark flint (chert) pebble

Microcrystalline quartz (SiO₂), commonly called flint or chert