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

Blue Chalcedony

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Carnelian

Carnelian (a variety of Chalcedony, SiO ₂)

Carnelian (Polished Agate/Jasper)

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Banded Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz

Silicon Dioxide (SiO2)

Granitoid Gneiss with Feldspar Vein

Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)

Green Jasper

Microcrystalline Quartz (SiO2)

Brecciated Quartz

Silicon Dioxide (SiO2) with iron oxide cement

Polished agate or jasper cabochon

Cryptocrystalline quartz, SiO₂, possibly iron-rich jasper inclusions

Basalt with Quartz/Epidote Vein

Mafic volcanic rock (formula primarily (Mg, Fe)2SiO4 and CaAl2Si2O8)

Clear Quartz

Silicon Dioxide (SiO2)

Mixed River Pebbles

Clastic Sedimentary Alluvial Deposit / Polymictic Conglomerate Clasts

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Likely weathered limestone or calcite-rich stone

Limestone, primarily calcium carbonate (CaCO₃), possibly calcite

Quartz River Rock

Silicon Dioxide (SiO2)

Red jasper (iron-rich chalcedony), possibly brecciated

Jasper: microcrystalline quartz, SiO₂, colored mainly by iron oxides/hydroxides

Red Jasper (or Ironstone/Jasper Conglomerate)

Microcrystalline Quartz with Hematite inclusions (SiO2 + Fe2O3)

Light-colored granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and minor mica, possibly with gneissic fabric

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂), possibly mica-bearing

Smoky Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)

Mixed pebble collection, including likely flint, quartzite, and fossil material

Varied silicate rocks; visible specimen may include chert (microcrystalline SiO₂), quartzite, and a possible fossil

Red Quartzite / Metasandstone River Pebble

Quartzite (primarily SiO2 with hematite inclusions)

Fossiliferous Limestone

Sedimentary rock containing Indeterminate Fossil remains (likely Crinoid stem or Bryozoan fragment)

Quartz (Milky Quartz)

Silicon Dioxide (SiO₂)

Quartz (Tumbled)

Silicon Dioxide (SiO2)

Jasper

Microcrystalline quartz (SiO2)

Polished/tumbled metallic sulfide specimen, likely pyrite

Pyrite (FeS₂), possibly mixed with chalcopyrite or other sulfides

Raw greenish-blue quartz-bearing mineral specimen

Likely fluorite or chalcedony/quartz; exact identification requires hardness and crystal tests

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous

Porphyritic Basalt (with Amygdales)

Amygdaloidal Porphyritic Basalt

Weathered limestone or calcitic fossil/reef fragment

Calcite-rich limestone (CaCO₃), possibly fossiliferous limestone

White Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide, SiO2)

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

Lichen-covered graywacke or granitic glacial cobble

Indeterminate; likely quartz–feldspar–mica rock, possibly weathered granite or granodiorite

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)