Organic Material (Likely A Fruit Or Berry)

Tumbled blue stone, likely sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue calcite or dyed material

Polished red banded stone, likely rhodonite

Rhodonite — manganese inosilicate, MnSiO₃; possibly rhodochrosite or dyed quartz

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica or iron-oxide impurities

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica (possibly gneissic if foliation is confirmed)

Quartz geode or drusy quartz cluster

Quartz (silicon dioxide, SiO₂), likely microcrystalline quartz lining a cavity

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Chert (River Pebble)

Microcrystalline Silica (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with hematite impurities

Worn quartz-rich pebble, likely chert or quartzite

Microcrystalline quartz (SiO₂), possibly quartzite

Likely weathered gray flint/chert pebble

Microcrystalline quartz (SiO₂), commonly with chalcedony and minor impurities

Likely weathered sandstone or iron-stained quartzite fragment

Quartz-rich sandstone (predominantly SiO₂; exact identification uncertain from image)

Chert (varietal Flint or Jasper)

Microcrystalline Quartz (SiO2)

Iron-stained quartz crystal

Quartz (SiO₂), likely iron-oxide-coated or included

Petrified Wood

Silicified Wood (SiO2 permineralization)

Tumbled quartzite pebble

Quartzite, predominantly crystalline SiO₂

Chert / Flint

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Chert (Jasper/Flint variant)

Microcrystalline quartz (SiO2)

Dyed blue tumbled stone, likely turquoise or howlite

Most likely dyed magnesite/howlite (CaCO₃), possibly turquoise (hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O)

Green aventurine (likely)

Quartzite dominated by quartz (SiO₂), colored green by fuchsite mica or chlorite

Chert (specifically Tan/Yellow Chert)

Silicon Dioxide (SiO2)

Likely quartz-bearing mineral aggregate

Quartz (SiO₂), possibly mixed with mica or feldspar

Fossiliferous limestone, possibly containing a brachiopod or bivalve fossil

Calcite-rich limestone (CaCO₃), with an apparent shell impression or shell fragment

Rounded granitic pebble

Granite, mainly quartz, feldspar, and biotite/hornblende

Chert Breccia

Brecciated Chert (Microcrystalline SiO2)

Possible dark igneous rock

Indeterminate; likely basalt or fine-grained mafic rock

Chert (concretionary/nodular variant)

Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions

Weathered banded sandstone pebble

Quartz-rich sandstone (predominantly SiO₂)

Petrified Wood

Silicified Wood (SiO2)

Chert (Field Stone)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (varieties include Flint and Mudstone)

Microcrystalline Silica (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (specifically River Stone / Jasper variety)

Microcrystalline Quartz (SiO2)

Weathered granite or granitic rock fragment

Granite; chiefly quartz, feldspar, and mica (composition uncertain from image)

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification requires testing

Banded gneiss (weathered glacial erratic)

Gneiss; typically quartz–feldspar–biotite ± hornblende

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide cement)

Quartzite

Quartzite (SiO2)

Biotite schist (probable mica schist)

Mica schist; chiefly quartz, biotite mica, and feldspar

Rhodonite-bearing metamorphic rock

Manganese-rich metamorphic rock, chiefly rhodonite (MnSiO₃), with quartz and manganese oxides

Iridescent schist or phyllite

Micaceous quartz-rich schist/phyllite, likely containing muscovite or chlorite