Mineral Composite

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

Zebra Jasper

Silicified sedimentary rock (SiO2) with mineral inclusions

Granite fragment

Granite (Felsic Plutonic Rock)

Blue Chalcedony

Chalcedony (Silicon Dioxide, SiO2)

Silver (Native Element)

Ag (Native Silver), with minor Copper (Cu)

Diorite or Granodiorite Pebble

Intermediate Phaneritic Igneous Rock

Gneissic Schist

Gneiss-schist (Metamorphic rock)

Citrine

Silicon Dioxide (Quartz variety), SiO2

Beryl (likely Aquamarine or Heliodor variant)

Beryllium aluminum cyclosilicate (Be3Al2Si6O18)

River Pebble

Quartzite / Weathered Sedimentary Rock

Granite

Felsic intrusive igneous rock

Granite

Intrusive Igneous Rock

Granite

Phaneritic Felsic Igneous Rock

Porphyritic Basalt or Diabase

Mafic igneous rock with porphyritic texture

Granite

Felsic intrusive igneous rock

Tumbled Quartz

Silicon Dioxide (SiO2)

Granite

Intrusive Igneous Rock

Sandstone

Clastic Sedimentary Rock

Rutilated Quartz

Silicon Dioxide (SiO2) with inclusions of Rutile (TiO2)

Granite

Intrusive Igneous Rock

Granite River Rock

Intrusive igneous rock (composed mainly of quartz, alkali feldspar, and plagioclase)

Sandstone with Dendritic Inclusions

Quartzose Sandstone

Granite

Intrusive Igneous Rock

N/A - Image is non-geological

Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)

Quartzite and Jasper Pebbles

Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)

Chalcedony Geode Fragment (Botryoidal)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Granite Pegmatite

Pegmatite (Fulgite / Felsic Intrusive Rock)

Fossilized coral (likely honeycomb or branching coral)

Fossil coral; probable Scleractinia or Tabulata, composition mainly microcrystalline CaCO₃

Sandstone (Ferruginous)

Sandstone (primarily SiO2 with iron oxide Fe2O3 staining)

Red Sandstone

Sandstone (lithic arenite or arkose with iron oxide)

Red Sandstone

Arenite (Ferruginous Sandstone)

Garden Quartz (Phantom Quartz)

Silicon Dioxide (SiO2) with various inclusions (often Chlorite, Hematite, or Iron)

Red Sandstone

Arenite (with Iron Oxide / Hematite staining)

Jasper containing epidote (Unakite-like)

Epidotized Jasper (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH))

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

Lepidolite

K(Li,Al)3(Al,Si)4O10(F,OH)2 (Lithium-bearing phyllosilicate)

Basalt with Quartz/Zeolite Inclusions

Porphyritic Basalt (SiO2 with Aluminosilicates)

Malachite

Copper Carbonate Hydroxide [Cu2CO3(OH)2]

Red Sandstone Pebble

Arenite with Hematite (Fe2O3) cement

Red Sandstone

Arenite (with Iron Oxide pigmentation)

Chatoyant Quartz (Cat's Eye Quartz)

Silicon Dioxide (SiO2) with fibrous inclusions of Amphibole or Rutile