Rock (Likely Sedimentary)

River Cobble (likely Sandstone or Siltstone type)

Sandstone or Siltstone (common rock types that form river cobbles)

Chert (Quartz Variety)

Silicon Dioxide (SiO2)

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Sandstone (likely Siltstone or Mudstone variety)

Clastic Sedimentary Rock (primarily SiO2 with iron oxides)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Jasper (likely Ocean Jasper or Variegated Jasper)

Silicon Dioxide (SiO2) with impurities

Orange Quartzite (Tumbled)

Quartzite (SiO2)

Sandstone (likely Arkosic or Quartzose)

Sandstone (SiO2 dominated)

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Banded Chert or Chert with Quartz Veins

Chert (SiO2)

Sandstone with trace fossil

Sandstone, possibly with Skolithos or similar trace fossil

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

White Chalcedony (likely Common Opal or Milky Quartz)

Silicon Dioxide (SiO2)

Chert (specifically Yellow Jasper)

Sedimentary Cryptocrystalline Quartz (SiO2)

Granite (River Pebble)

Phaneritic intrusive igneous rock (Felsic)

Quartz (on matrix)

Quartz (Silicon Dioxide, SiO₂)

Grey River Pebble (Likely Quartz-rich or Limestone)

Clastic Sedimentary Rock (typically SiO2 or CaCO3 based)

Pumice (likely)

Pumice (extrusive igneous rock)

Basalt with inclusion

Basalt (Aphanitic-Porphyritic texture)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Ferruginous Sandstone

Sandstone, Iron-rich

Drill Core Samples (Varied Lithology)

Multi-lithological core samples (containing potential granite, marble, and phyllite/schist sequence)

Quartz (likely Clear Quartz or Rock Crystal)

Quartz (SiO2)

Pyrite

Iron Sulfide (FeS2)

Sandstone (likely Navajo Sandstone)

Arenite (primarily SiO2)

Gneiss (specifically a granitic gneiss cobble)

Gneiss (high-grade regional metamorphic rock)

Quartz Vein in Host Rock (Likely Slate or Shale)

Hydrothermal Quartz (SiO2) in Pelitic host rock

Banded Iron Formation

Banded Iron Formation (BIF)

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Granite Cobble

Granite (Phaneritic Igneous Rock)

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Glacial Erratic (Sandstone/Quartzite)

Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)

Basalt (with Plagioclase Phenocrysts)

Porphyritic Basalt

Granite

Granite (a felsic intrusive igneous rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Not a rock, mineral, or geological specimen

Quartz Geode (partially formed/chalcedony with iron staining)

Quartz (SiO2) with Chalcedony (cryptocrystalline quartz) and likely Iron Oxides/Hydroxides

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)